TripletSemiHardLoss( margin: FloatTensorLike = 1. pytorch face-recognition facenet multi-gpu triplet-loss center-loss lfw-dataset cross-entropy-loss pretrained-model vggface2-dataset Updated Mar 18, 2020; Python. The comparative losses (typically, triplet loss) are appealing choices for learning person re-identification (ReID) features. the triplet loss [39,33] in image classiﬁcation, we introduce a discriminative loss function to replace the pixel-wise soft-max loss that is commonly used in semantic segmentation. In this setup, pairs of objects are given together with a measure of their similarity. In this post, we'll focus on models that assume that classes are mutually exclusive. \[L = max((1 - \alpha)\cdot min(D_{an}) - (1 + \alpha)\cdot max(D_{ap}) + m, 0)\] Next Previous. To justify the proposed loss, we present a theoretical analysis of the relationships of three different losses: our quadruplet loss, the triplet loss and the commonly used binary classification loss. View aliases. Triplet Loss是Google在2015年发表的FaceNet论文中提出的，论文原文见附录。Triplet Loss即三元组损失，我们详细来介绍一下。 Triplet Loss定义：最小化锚点和具有相同身份的正样本之间的距离，最小化锚点和具有不同身份的负样本之间的距离。. **摘要:**triplet loss 可以提高特征匹配的性能，可用物体识别，人脸识别，检索等方面，本文用matlab实现triplet loss。 triplet loss 就是学习一个函数隐射 f ( x ) , 从特征 x 映射到 R D , 有如下关系： y = f ( x ). However, the triplet loss is computationally much more expensive than the (practically more popular) classification loss, limiting their wider usage in massive datasets. Recently, deep learning networks with a triplet loss become a common framework for person ReID. Derivative of Cross Entropy Loss with Softmax. Main aliases. from_logits (bool, default False) - Whether input is a log probability (usually from log_softmax) instead of unnormalized numbers. Table of contents. This second step uses triplets of weight-sharing networks and learns to preserve the ranking order of triplets of images. FaceNet: A Unified Embedding for Face Recognition and Clustering 서치솔루션 김현준 2. facenet triplet loss with keras (2) I am trying to implement facenet in Keras with Thensorflow backend and I have some problem with the triplet loss. My question is the following: does it make sense to combine a triplet loss with a cross-entropy in the same network. The summation is over the set of all possible triplets in the training set. label_smooth (bool, optional) – whether to apply label smoothing. According to the writers of this paper, their method showed the best results compared to other loss functions that are good with face recognition like triplet loss, intra-loss and inter-loss. 07732] Pose Invariant Embedding for Deep Person Re-identification NLPVideo： [1704. The triplet loss [26] is normally trained on a series of triplets {x i,x j,x k}, where x i and x j are images from the same person, and x k is from a different person. triplet Source code for torchreid. Triplet Lossは、2014年4月にarxivで発表された論文 2 で、画像検索における順位付けを学習するために提案されたのが最初のようです。画像検索のためのアノテーション作業において、何十枚もの画像を、似ている順番に人手で並べてラベル付け. Quadruplet loss. CVPR 2016 摘要：跨摄像机的行人再识别仍然是一个具有挑战的问题，特别是摄像机之间没有重叠的观测区域。. The loss function operates on triplets, which are three examples from the dataset: \(x_i^a\) - an anchor example. GitHub - omoindrot/tensorflow-triplet-loss: Implementation of triplet loss in TensorFlow; mathgeekjp 2020-03-19 21:14. Then import with: from online_triplet_loss. person-reid-triplet-loss-baseline Rank-1 89% (Single Query) on Market1501 with raw triplet loss, In Defense of the Triplet Loss for Person Re-Identification, using Pytorch layumi/2016_person_re-ID. The energetic particle dropout observed by Voyager near closest approach occurred near the predicted times when Voyager passed within the atmospheric drift shadow. md file to showcase the performance of the model. A triplet loss with a novel viewpoint-based input selection strategy is introduced, which could learn more powerful features after incorporating the spatial relationship between viewpoints. Include the markdown at the top of your GitHub README. 2 anchor = y_pred[0] positive = y_pred[1] negative = y_pred[2] # Step 1: Compute the (encoding) distance between the anchor and the positive, you will need to sum over axis=-1 pos_dist = K. This is a matlab implementation of CNN (convolutional neural network) triplet loss function, based on the article "FaceNet: A Unified Embedding for Face Recognition and Clustering" Google Inc 2015. The formula above represents the triplet loss function using which gradients are calculated. The following section will give you an explanination about the approach. In this paper, we propose the use of the triplet network [33, 14, 26, 35] (Fig. However, compared to the image sam-ples, the number of training pairs or triplets dramatically grows. Triplet Loss Funciton. tained directly from optimizing SoftMax loss, which is pro-posed for classiﬁcation, perform well on the simple distance based tasks [22,30] and face recognition [2,9,10,27,28]. A PyTorch reimplementation of the Triplet Loss in Tensorflow. Maybe this is useful in my future work. Triplet loss minimises the distance be-. Train network to one image size(224x224) and fine tune after for less epochs to larger size(448x448 for example) Train image detection network with image classification dataset. Cross-entropy loss for attributes, Euclidean loss for landmarks, triplet loss for pairs. Recently, Wang et al. CKL learns the kernel by minimizing the empirical log-loss: min K X 8(i;j;‘)2T log(pij‘) subject to: (1) 8i: kii= 1 (2) K 0: The scale constraint is necessary because the objective is in-herently scale-invariant. conv1 conv2 conv3 conv4 conv5 pose fc6&7 pose loc. This second step uses triplets of weight-sharing networks and learns to preserve the ranking order of triplets of images. BeamSearchDecoderOutput(scores, predicted_ids, parent_ids) View aliases. pip install online_triplet_loss. GitHub Gist: instantly share code, notes, and snippets. 活体检测 学习度量而非直接分类 Deep Anomaly Detection for Generalized Face Anti-Spoofing 05-21. The loss function operates on triplets, which are three examples from the dataset: \(x_i^a\) - an anchor example. def batch_all_triplet_loss (labels, embeddings, margin, squared = False): ''' triplet loss of a batch ----- Args: labels: 标签数据，shape = （batch_size,） embeddings: 提取的特征向量， shape = (batch_size, vector_size) margin: margin大小， scalar Returns: triplet_loss: scalar, 一个batch的损失值 fraction_postive_triplets. Install the module using the pip utility ( may require to run as sudo ). I call the fit function with 3*n number of images and then I define my custom loss function as follows:. Heck, even if it was a hundred shot learning a modern neural net would still probably overfit. Deep Learning Face Representation from Predicting 10,000 Classes. Advantage: Quadruplet loss can reduce the intra-class variance and enlarge the inter -class variance, which enhances the generalization ability. triplets_per_anchor: The number of triplets per element to sample within a batch. Batch All Triplet Loss FaceNet Triplet Loss训练时数据是按顺序排好的3个一组3个一组。 假如batch_size=3B,那么实际上有多达 \(6B^2-4B\)种三元组组合，仅仅利用B组就很浪费。. For Triplet Loss, the objective is to build triplets consisting of an anchor image, a positive image (which is similar to the anchor image) and a negative image (which is dissimilar to the anchor image). Train with 1000 triplet loss euclidean distance. ML Resources. The main difference is that only pairs of images are compared, whereas the triplet loss encourages a relative distance constraint. TripletSemiHardLoss. In this paper we present a system, called FaceNet, that directly learns a mapping from face images to a compact Euclidean space where distances directly correspond to a measure of face similarity. The result is in the following figure (the caption includes the analysis; in short, every component is essential). 0 and I used Casia-WebFace as dataset. Explain Code! Everythin about data is running by main_data_engine. Table of contents. Carnegie Mellon University 3. Tensor Args: y_true: 1-D integer Tensor with shape [batch_size] of multiclass integer labels. triplet from __future__ import division , print_function , absolute_import import time import datetime from torchreid import metrics from torchreid. num_classes (int) – number of classes. Eng and Dr. global descriptors for visual search. SoftTriple Loss: Deep Metric Learning Without Triplet Sampling. GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together. handong1587's blog. Measuring distances between two images' encodings allows you to determine whether they are pictures of the same person. Our loss function enforces the network to map each pixel in the image to an n-dimensional vector in feature space, such. Fine-tuning with constrastive or triplet loss, learning to rank. Submit results from this paper to get state-of-the-art GitHub badges and help the community compare results to other papers. As in GNMDS, learning in CKL is. facenet是一个基于tensorflow的人脸识别代码，它实现了基于center-loss+softmax-loss 和 tripletloss两种训练方法，两者的上层的网络结构可以是一样的，主要区别在于最后的loss的计算，center-loss+softmax-loss的实现方法相对来说比较好理解一些，而triplet-loss则比较复杂，具体的. Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4. Each triplet consists of a positive pair and a negative pair by sharing the same anchor point. Our paper "Beyond triplet loss: a deep quadruplet network for person re-identification" is accepted by CVPR2017. Let’s try the vanilla triplet margin loss. Visual-based Product Retrieval with Multi-task Learning and Self-attention Haibo Su1, Chao Li 2, Wenjie Wei , Qi Wu , and Peng Wang1 1Northwestern Polytechnical University, Xi’an, China 2Vismarty Technology Co. The proposed MMT framework achieves considerable improvements of 14. GitHub - omoindrot/tensorflow-triplet-loss: Implementation of triplet loss in TensorFlow; mathgeekjp 2020-03-19 21:14. For example, to train an image reid model using ResNet50 and cross entropy loss, run python train_img_model_xent. Triplet loss is a loss function that come from the paper FaceNet: A Unified Embedding for Face Recognition and Clustering. Despite significant recent advances in the field of face recognition, implementing face verification and recognition efficiently at scale presents serious challenges to current approaches. In this setup, pairs of objects are given together with a measure of their similarity. triplet_margin_loss(). Triplet Lossは、2014年4月にarxivで発表された論文 2 で、画像検索における順位付けを学習するために提案されたのが最初のようです。画像検索のためのアノテーション作業において、何十枚もの画像を、似ている順番に人手で並べてラベル付け. 2): """ Implementation of the triplet loss function Arguments: y_true -- true labels, required when you define a loss in Keras, not used in this function. metric_alone_epochs: At the beginning of training, this many epochs will consist of only the metric_loss. I call the fit function with 3*n number of images and then I define my custom loss function as follows:. Badges are live and will be dynamically updated with the latest ranking of this paper. Limitations on an l 2 embedding. Source codes are available at [github: torch, blocks]. VideoDataManager. triplet_semihard_loss( y_true, y_pred, margin=1. Besides, our. During back propagation, the three gradients will be summed and then passed through the embedder model ( deep learning book chapter 6 , Algorithm 6. Method - Triplet Loss We want to ensure that an image x i a of a specific person is closer to all other images x i p of that same person than it is to any image x i n of any other person by a margin. png) ![Inria](images/inria. Popular loss functions for learning an embedding space are contrastive or triplet loss. 68% only with softmax loss. It inevitably results in slow convergence and instability. Introduction¶. arXiv:1703. com Results: As you see in following, even if text are written in all different format the model is able to interpret the intent and accordingly generating images. Pooling from CNN representations: MAC, R-MAC, SPoC*, CroW*. I-Face Recognition What is face recognition Face verification & face recognition verification: input = image and ID → output whether the image and ID are the same. Goal of FaceNet • 다음을 만족하는 임베딩 함수를 찾는다 • Invariant • 표정, 조명, 얼굴 포즈 …. FaceNet and Triplet Loss: FaceNet is a one-shot model, that directly learns a mapping from face images to a compact Euclidean space where distances directly correspond to a measure of face similarity. FaceNet Triplet Loss. Triplet loss 和 triplet mining. Consider reducing batch size and learning rate if you only have one GPU. So the positive examples is of the same person as the anchor, but the negative is of a different person than the anchor. Cross-entropy loss for attributes, Euclidean loss for landmarks, triplet loss for pairs. For Triplet Loss, the objective is to build triplets consisting of an anchor image, a positive image (which is similar to the anchor image) and a negative image (which is dissimilar to the anchor image). Note that even though the TripletMarginLoss operates on triplets, it's still possible to pass in pairs. サンプルの組みごとにlossを計算する。 GoogleのFaceNetをベースにした GitHub - davidsandberg/facenet: Face recognition using Tensorflow で書かれているTriplet lossを確認してみた。 def triplet_loss(anchor, positive, negative, alpha): """Calculate the triplet loss according to the FaceNet paper Args: anchor: the embeddings for the anchor image…. Abhimanyu Kapil Contact Me Data Science & Machine Learning WebDevelopment Mobile AppDevelopment About Me I’m have been a researcher and developer for 6 plus years. I'll update the README on GitHub as soon as it is. metric_alone_epochs: At the beginning of training, this many epochs will consist of only the metric_loss. One epoch of such training process based on a na"ive optimization of the triplet loss function has a run-time complexity O(N^3), where N is the number of training samples. In Defense of the Triplet Loss Again: Learning Robust Person Re-Identification with Fast Approximated Triplet Loss and Label Distillation. GitHub Gist: instantly share code, notes, and snippets. Proposed Object Recognition on-the-ﬂy framework. (right) Scattered plot of 1024 images at epoch 44. A visualization of deeply-learned features by (a) softmax loss, (b) triplet loss, (c) softmax loss + center loss, (d) triplet center loss, (e) softmax loss + triplet center loss. A pre-trained model using Triplet Loss is available for download. In this paper, we follow the framework of Adversarial Training and introduce Triplet Loss [Schroff et al. Triplet loss is known to be difficult to implement, especially if you add the constraints of building a computational graph in TensorFlow. In this post, we'll focus on models that assume that classes are mutually exclusive. Measuring distances between two images’ encodings allows you to determine whether they are pictures of the same person. py for generating images above. Each image that is fed to the network is used only for computation of contrastive/triplet loss for only one pair/triplet. TripletSemiHardLoss( margin: FloatTensorLike = 1. com Results: As you see in following, even if text are written in all different format the model is able to interpret the intent and accordingly generating images. A triplet is composed by a, p and n (i. 0 is the nearly halved execution time as a result of more efficient image alignment for preprocessing and smaller neural network models. You may learn more from model. Sign up Person re-ID baseline with triplet loss. loss is similar to the triplet loss we employ [12,19], in that it minimizes the L 2-distance between faces of the same iden-tity and enforces a margin between the distance of faces of different identities. Loss-augmented inference To use the upper bound, we must solve: (g^; g^+; g^ ) = argmax (g;g+;g ) ‘ triplet g; g+; g + gT f(x) + g+T f(x+) + g T f(x ) There are 23q possible binary codes to maximize over. It is a Sigmoid activation plus a Cross-Entropy loss. 2 M images). For the challenge of text-independent speaker verification against short utterances, the literature [20] presents an end-to-end. py: train video model with combination of cross entropy loss and hard triplet loss. 三元组损失：最小化锚点和具有相同的身份的正例之间的距离，并最大化锚点和不同身份的负例之间的距离。. In the best experiments the weights of (BCE, dice, focal), that. The triplet network inspiring from the siamese networks will have three copies of the network with shared weights. Triplet Loss及tensorflow实现. 2): Implementation of the triplet loss function Arguments: y_true -- true labels, required when you define a loss in Keras, not used in this function. At the end of our last post, I briefly mentioned that the triplet loss function is a more proper loss designed for both recommendation problems with implicit feedback data and distance metric learning problems. py for generating images above. My supervisor is Prof. SciTech Connect. 在Pytorch中有一个类，已经定义好了triplet loss的criterion, class TripletMarginLoss(Module): class TripletMarginLoss(Module): r"""Creates a criterion that measures the triplet loss given an input tensors x1, x2, x3 and a margin with a value greater than 0. GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. In the past few years, the field of computer vision has gone through a revolution fueled mainly by the advent of large datasets and the adoption of deep convolutional neural networks for end-to-end learning. In the past few years, the field of computer vision has gone through a revolution fueled mainly by the advent of large datasets and the adoption of deep convolutional neural networks for end-to-end learning. One Shot learning, Siamese networks and Triplet Loss with Keras One Shot Learning" and using a specific loss function called the "Triplet Loss" code is available here on my github. The loss function is described as a Euclidean distance function: Where A is our anchor input, P is the positive sample input, N is the negative sample input, and alpha is some margin we use to specify when a triplet has become too "easy" and we no longer want to adjust the weights from it. For deployment (b), the network is simpliﬁed to a single branch, since all weights are. Explain Code! Everythin about data is running by main_data_engine. All the relevant code is available on github in model/triplet_loss. In this paper we present a system, called FaceNet, that directly learns a mapping from face images to a compact Euclidean space where distances directly correspond to a measure of face similarity. Results of triplet loss on Testing Set. Siamese Network＋Triplet lossの論文として名高い「FaceNet」の論文を読んだのでその解説と実装を書いていきます。Train with 1000を使って実験もしてみました。 TL;DR FaceNe. Finally, we also show that the use of the central-surround siamese network trained with the global loss produces the best result of the field on the UBC dataset. A visualization of deeply-learned features by (a) softmax loss, (b) triplet loss, (c) softmax loss + center loss, (d) triplet center loss, (e) softmax loss + triplet center loss. Simply an implementation of a triple loss with online mining of candidate triplets used in semi-supervised learning. The extension is currently published and can be installed on the Chrome Web Store and will be available for Firefox soon. Xiao Wang 2016. Google的人脸认证模型FaceNet(参考文献[2]), 不要求同类目标都靠近某个点，只要同类距离大于不同类间距离就行。完美的契合人脸认证的思想。 Batch All Triplet Loss. The triplet loss can be expressed as L triplet(x a,x p,x n) = max{0,D(x a,x p)D(x a,x n)+m}, (4) where D(x i,x j)=||f(x i)f(x j)|| 2 is the Euclidean dis-tance between the mean latent vector of images x i and x j. Caffe For FaceNet Modified Caffe Framework For FaceNet. This repository is an implementation of following "medium" story: Image similarity using Triplet Loss Execute… github. Triplet Loss及tensorflow实现. 2016), Triplet loss (Schroff, Kalenichenko, and Philbin 2015) and Multi-batch (Tadmor et al. Any suggestion is welcomed. # The reason to use the output as zero is that you are trying to minimize the # triplet loss as much as possible and the minimum value of the loss is zero. What’s special about the implementation for Deeplearning4j is that the pieces required for loss calculation are more modular, and the vertices we created for DL4J’s ComputationGraph can be re-used for other setups. One-stage: OverFeat, YOLO, SSD*, RetinaNet, focal loss. 1、前言Triplet loss是非常常用的一种deep metric learning方法，在图像检索领域有非常广泛的应用，比如人脸识别、行人重识别、商品检索等。传统的triplet loss训练需. FaceNet: A Unified Embedding for Face Recognition and Clustering. However, training in previous works can be prohibitively expensive due to the fact that optimization is directly. Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4. 3、Triplet Loss 三元组损失函数，三元组由Anchor、Negative、Positive组成，从上图可以看到，triplet loss 就是使同类距离更近，类间更加远离。 表达第一项为类内距离，中间项为类间距离，\(\alpha\)为margin。. We train our representations using a triplet loss, where multiple simultaneous viewpoints of the same observation are attracted in the embedding space, while being repelled from temporal neighbors which are often visually similar but functionally different. Unlike other approaches using triplet learning networks [20] [21] [22], our approach is fully-unsupervised and does not require additional label data for the triplets. The triplet defines a relative similarity between samples. This is also exactly for our proposed Copernican loss optimizes for. In other words, it is used to measure how good our model can predict the true class of a sample from the dataset. This repo is about face recognition and triplet loss. layers import Input from keras. To have an L2 distance of 1 between two points on the circle they need to be separated by an angle of 60°. Each triplet consists of a positive pair and a negative pair by sharing the same anchor point. ONNX models. By introducing multiple input channels in the network and appropriate loss functions, the Siamese Network is able to learn to represent similar inputs with similar embedding features and represent different inputs with different embedding features. As a distance metric L2 distance or (1 - cosine similarity) can be used. To this end, a dual-triplet loss is introduced for metric learning, where two triplets are constructed using video data from a source camera, and a new target camera. The contrastive loss function consists of positive pairs and negative pairs. In evaluation, we use the cleaned FaceScrub and MegaFace released by iBUG_DeepInsight. triplet_margin_loss() Examples The following are code examples for showing how to use torch. Github Repositories Trend onnx/models ONNX models Total stars 2,227 Stars per day 2 Created at 2 years ago Related Repositories dogs_vs_cats Code for reproducing the results of our "In Defense of the Triplet Loss for Person Re-Identification" paper. recognition: database = K persons, input = image → output = ID of the image among the K person or "not recognized". Our paper "Beyond triplet loss: a deep quadruplet network for person re-identification" is accepted by CVPR2017. triplet Source code for torchreid. Let’s try the vanilla triplet margin loss. The same encoding can be used for verification and recognition. However, compared to the image sam-ples, the number of training pairs or triplets dramatically grows. Goal of FaceNet • 다음을 만족하는 임베딩 함수를 찾는다 • Invariant • 표정, 조명, 얼굴 포즈 …. 在Pytorch中有一个类，已经定义好了triplet loss的criterion, class TripletMarginLoss(Module): class TripletMarginLoss(Module): r"""Creates a criterion that measures the triplet loss given an input tensors x1, x2, x3 and a margin with a value greater than 0. To this end, a dual-triplet loss is introduced for metric learning, where two triplets are constructed using video data from a source camera, and a new target camera. static Tensor at::triplet_margin_loss (const Tensor &anchor, const Tensor &positive, const Tensor &negative, double margin = 1. Thus, the whole loss could be described as following: Only select triplets randomly may lead to slow converage of the network, and we need to find those hard triplets, that are active and can therefore contribute to improving the model. We know that the dissimilarity between a and p should be less than the dissimilarity between a and n,. GitHub Gist: instantly share code, notes, and snippets. What I tried so far is training a triplet loss with hard negative sampling. First we compute the difference of each triplet (query, positive document, negative document). Large-Margin Softmax Loss for Convolutional Neural Networks all merits from softmax loss but also learns features with large angular margin between different classes. Recently, deep learning networks with a triplet loss become a common framework for person ReID. In this post, I will define the triplet loss and the different strategies to sample triplets. Triplet-loss engine for image-reid. However, I don't understand why the distinction between the anchor and the positive still exists in the loss function. Let be an anchor image of a specific person, be a positive image of this same person from a different angle and be a negative image of a different person. Have a look at the GitHub Repository for more information. The gradients of the loss function pull together positive pairs and push apart negative pairs. png) ![Inria](images/inria. Badges are live and will be dynamically updated with the latest ranking of this paper. I like working on various complex problems in Machine learning and Deep Learning including … Home Read More ». (right) Softmax with center loss Update (2017/11/10) Remove the one-hot inputs for Embedding layer and replace it by single value labels. A pre-trained model using Triplet Loss is available for download. from Google in their 2015 paper titled “FaceNet: A Unified Embedding for Face Recognition and Clustering. This is typically achieved by minimizing a regularized loss. The code structure is adapted from code I wrote for CS230 in this repository at tensorflow/vision. Deep Learning course: lecture slides and lab notebooks. The energetic particle dropout observed by Voyager near closest approach occurred near the predicted times when Voyager passed within the atmospheric drift shadow. Let be an anchor image of a specific person, be a positive image of this same person from a different angle and be a negative image of a different person. Triplet loss Learning. View aliases. 活体检测 学习度量而非直接分类 Deep Anomaly Detection for Generalized Face Anti-Spoofing 05-21. Caffe For FaceNet Modified Caffe Framework For FaceNet. GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. People like to use cool names which are often confusing. In other words, given a triplet that's already chosen, both the anchor and the positive corresponds to the same person. Differences. Our paper "Beyond triplet loss: a deep quadruplet network for person re-identification" is accepted by CVPR2017. Cross Entropy Loss with Softmax function are used as the output layer extensively. The workflow of triplet loss based on deep metric learning. Kaiqi Huang. Training with a triplet loss can lead to underwhelming results, so this paper use mining hard triplets for learning. approaches, contrastive loss [10,29] and triplet loss [27] respectively construct loss functions for image pairs and triplet. Person re-identification (ReID) is an important task in wide area video surveillance which focuses on identifying people across different cameras. Weighted cross-entropy loss for a sequence of logits. The results are promising but I'm hoping for more. SphereFace: Deep Hypersphere Embedding for Face Recognition Weiyang Liu1, Yandong Wen2, Zhiding Yu2, Ming Li2,3, Bhiksha Raj2, Le Song1 1. Now while acquiring more data from our test bed, we are trying out with different loss functions to separate the traffic. com/lossless-triplet-loss-7e932f990b24. 0, margin=1. Facial Rec with Movidius, Siamese Nets & Triplet Loss Siamese Neural Networks trained using Triplet Loss to classify known and unknown faces. backtesting. Given the same feature extraction in baselines [2], [28], we can apply the triplet loss to the score map. Cross-entropy loss for attributes, Euclidean loss for landmarks, triplet loss for pairs. For triplet loss functions that depend only on the value of d(g; g+; g ) kg g+ kH k g g kH; an exact O(q2) dynamic programming algorithm exists. triplet¶ chainer. Carnegie Mellon University 3. Batch All Triplet Loss FaceNet Triplet Loss训练时数据是按顺序排好的3个一组3个一组。 假如batch_size=3B,那么实际上有多达 \(6B^2-4B\)种三元组组合，仅仅利用B组就很浪费。. This paper was presented in the Advances in Neural Information Processing Systems (NIPS) 2016 by Kihyuk Sohn from NEC laboratories america. Badges are live and will be dynamically updated with the latest ranking of this paper. The proposed network with the margin-based online hard negative mining would be introduced at last. In this setup, pairs of objects are given together with a measure of their similarity. It means that these. Let be an anchor image of a specific person, be a positive image of this same person from a different angle and be a negative image of a different person. FaceNet: A Unified Embedding for Face Recognition and Clustering 1. Big neural networks have millions of parameters to adjust to their data and so they can learn a huge space of possible. But actually, we don’t need to do it, because after few iterations of training there will be many triplets which don’t violate the triplet constraint (give zero loss). Facial Rec with Movidius, Siamese Nets & Triplet Loss Siamese Neural Networks trained using Triplet Loss to classify known and unknown faces. from Google in their 2015 paper titled “FaceNet: A Unified Embedding for Face Recognition and Clustering. 但triplet network 通常能学到更好的特征，所以人脸识别的 文章使用triplet network进行人脸特征抽取，外加svm后进行分类。 针对Triplet loss的缺陷还有一些改进：. In this paper we present a system, called FaceNet, that directly learns a mapping from face images to a compact Euclidean space where distances directly correspond to a measure of face similarity. GitHub Gist: instantly share code, notes, and snippets. approaches, contrastive loss [10,29] and triplet loss [27] respectively construct loss functions for image pairs and triplet. Despite simple learning, the results show fairly accurate retrieval results. Triplet loss : it is not proper for large-scale datasets because of its explosion of combinatorial and semi-hard sample mining is quite hard thing to solve for effective model training SphereFace : its multiplication with integer makes convergence hard because the target logit curve very precipitous. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. The proposed network with the margin-based online hard negative mining would be introduced at last. Triplet Lossの登場. train_vid_model_xent_htri. 0 / Keras, we can implement the Loss base class. Model Structure. losses import TripletLoss , CrossEntropyLoss from. It provides simple way to create custom triplet datasets and common triplet mining loss techniques. Visual Relationship Detection Arxiv2017_Acquiring Common Sense Spatial Knowledge through Implicit Spatial Templates Spatial understanding Explicit spatial relationship (e. [email protected] In all examples, embeddings is assumed to be of size (N, embedding_size), and labels is of size (N). Goal of FaceNet • 다음을 만족하는 임베딩 함수를 찾는다 • Invariant • 표정, 조명, 얼굴 포즈 …. Benchmarks for different models and loss functions on various datasets. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I might also try some different loss functions and show my findings. To have an L2 distance of 1 between two points on the circle they need to be separated by an angle of 60°. PyTorch is an optimized tensor library for deep learning using GPUs and CPUs. intro: ESANN 2011. Biography I am a third-year Ph. 基于Triplet loss函数训练人脸识别深度网络（Open Face） cmusatyalab. 0 ) where: Args: labels: 1-D tf. L =L s +λL m (3) where λ is used for balancing the two loss functions. Here we will not follow this implementation and start from scratch. ” Rather than calculating loss based on two examples, triplet loss involves an anchor example and one positive or matching example (same class) and one negative or non-matching example (differing class). The loss function is described as a Euclidean distance function: Where A is our anchor input, P is the positive sample input, N is the negative sample input, and alpha is some margin we use to specify when a triplet has become too "easy" and we no longer want to adjust the weights from it. SoftTriple Loss: Deep Metric Learning Without Triplet Sampling Qi Qian1 Lei Shang 2Baigui Sun Juhua Hu3 Hao Li2 Rong Jin1 1 Alibaba Group, Bellevue, WA, 98004, USA 2 Alibaba Group, Hangzhou, China 3 School of Engineering and Technology University of Washington, Tacoma, WA, 98402, USA fqi. Triplet Selection:. In all examples, embeddings is assumed to be of size (N, embedding_size), and labels is of size (N). Caffe For FaceNet Modified Caffe Framework For FaceNet. In this paper, we design a cluster loss, which can lead to the model output with a larger inter-class variation and a smaller intra-class variation compared to the triplet loss. However, compared to the image sam-ples, the number of training pairs or triplets dramatically grows. It means that these. Badges are live and will be dynamically updated with the latest ranking of this paper. com, [email protected] Google的人脸认证模型FaceNet(参考文献[2]), 不要求同类目标都靠近某个点，只要同类距离大于不同类间距离就行。完美的契合人脸认证的思想。 Batch All Triplet Loss. Baseline Code (with bottleneck) for Person-reID (pytorch). Every classes are visually seperated. GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together. GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. GitHub Gist: instantly share code, notes, and snippets. The global loss to produce a feature embedding minimises the variance of the distance between descriptors (in the embedded space) belonging to the same and. From another perspective, minimizing cross entropy is equivalent to minimizing the negative log likelihood of our data, which is a direct measure of the predictive power of our model. Nowadays, the triplet loss network is widely used in face recognition and object detection. combine softmax loss with contrastive loss [25, 28] or center loss [34] to enhance the discrimination power of features. triplet loss 原理以及梯度推导 ; 3. another way that works as well: treat as a binary classification problem. Large-Margin Softmax Loss for Convolutional Neural Networks all merits from softmax loss but also learns features with large angular margin between different classes. Google的人脸认证模型FaceNet(参考文献[2]), 不要求同类目标都靠近某个点，只要同类距离大于不同类间距离就行。完美的契合人脸认证的思想。 Batch All Triplet Loss. Siamese Network is a semi-supervised learning network which produces the embedding feature representation for the input. As in GNMDS, learning in CKL is. Creates a criterion that measures the triplet loss given an input tensors :math: x1, :math: x2, :math: x3 and a margin with a value greater than :math: 0. TripletMarginLoss(margin=0. Each image that is fed to the network is used only for computation of contrastive/triplet loss for only one pair/triplet. In particular, our model is able to capture rare instances and successfully colorize them. Triplet loss is a loss function that come from the paper FaceNet: A Unified Embedding for Face Recognition and Clustering. We demonstrate that it performs inferior in a clustering task. TristouNet: Triplet Loss for Speaker Turn Embedding 14 Sep 2016 • Hervé Bredin TristouNet is a neural network architecture based on Long Short-Term Memory recurrent networks, meant to project speech sequences into a fixed-dimensional euclidean space. 0 / Keras, we can implement the Loss base class. triplet loss. TripletMarginLoss (margin = 0. SGD optimizer is used. Badges are live and will be dynamically updated with the latest ranking of this paper. GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Pair miners output a tuple of size 4: (anchors, positives, anchors. Apr 3, 2019 Understanding Ranking Loss, Contrastive Loss, Margin Loss, Triplet Loss, Hinge Loss and all those confusing names A review of different variants and names of Ranking Losses, Siamese Nets, Triplet Nets and their application in multi-modal self-supervised learning. png) ![Inria](images/inria. Contribute to omoindrot/tensorflow-triplet-loss development by creating an account on GitHub. Triplet Loss 实验1. So, given three images, A, P, and N, the anchor positive and negative examples. Visual Computing-Alibaba-V1(clean) A single model (improved Resnet-152) is trained by the supervision of combined loss functions (A-Softmax loss, center loss, triplet loss et al) on MS-Celeb-1M (84 k identities, 5. Every classes are visually seperated. On the contrary, optimizing SoftMax loss, which is a classification loss, with DNN shows a superior performance in certain DML tasks. Implementation of triplet loss in TensorFlow. 68% only with softmax loss. Photo: Three Palms by Jamie Davies. Let be an anchor image of a specific person, be a positive image of this same person from a different angle and be a negative image of a different person. triplet loss. applications import VGG16 from keras. This notebook will demonstrate how to use the Weight Normalization layer and how it can improve convergence. Caffe For FaceNet Modified Caffe Framework For FaceNet. Figure: (left) taken from the paper. If nothing happens, download GitHub Desktop and try again. Goal of FaceNet • 다음을 만족하는 임베딩 함수를 찾는다 • Invariant • 표정, 조명, 얼굴 포즈 …. Default is 0. Measuring distances between two images’ encodings allows you to determine whether they are pictures of the same person. Person re-identification (ReID) is an important task in wide area video surveillance which focuses on identifying people across different cameras. recognition - triplet loss github facenet triplet loss with keras (2) I am trying to implement facenet in Keras with Thensorflow backend and I have some problem with the triplet loss. , anchor, positive examples and negative examples respectively). Search best triplet thresholds during validation. 24963/ijcai. from pytorch_metric_learning import losses loss_func = losses. I am new to this so how to. Google的人脸认证模型FaceNet(参考文献[2]), 不要求同类目标都靠近某个点，只要同类距离大于不同类间距离就行。完美的契合人脸认证的思想。 Batch All Triplet Loss. It inevitably results in slow convergence and instability. The summation is over the set of all possible triplets in the training set. GitHub Gist: instantly share code, notes, and snippets. A pre-trained model using Triplet Loss is available for download. approaches, contrastive loss [10,29] and triplet loss [27] respectively construct loss functions for image pairs and triplet. Binary Cross-Entropy Loss. ABD-Net: Attentive but Diverse Person Re-Identification. Train with 1000 triplet loss euclidean distance. The loss function is described as a Euclidean distance function: Where A is our anchor input, P is the positive sample input, N is the negative sample input, and alpha is some margin we use to specify when a triplet has become too "easy" and we no longer want to adjust the weights from it. 2 M images). Papers With Code is a free. Hard Sample Mining: Triplet Hard Loss Generate a triplet from each line in the matrix Each image in the batch The largest distance in the diagonal block. png) ![Inria](images/inria. 1-(d)) and a new global loss function to train local image descriptor learning models that can be applied to the siamese and triplet networks (Fig. All the relevant code is available on github in model/triplet_loss. triplet_semihard_loss( y_true: TensorLike, y_pred: TensorLike, margin: FloatTensorLike = 1. However, center loss only explicitly encourages intra-class compact-ness. intro: CVPR 2014. The comparative losses (typically, triplet loss) are appealing choices for learning person re-identification (ReID) features. The results are promising but I'm hoping for more. The summation is over the set of all possible triplets in the training set. Lossless triplet loss. Semihard Negative - Triplet Loss. Thanks to the triplet loss paradigm used for training, the resulting sequence embeddings can be compared directly with the euclidean distance, for speaker comparison purposes. Parameters:. The GAN Zoo A list of all named GANs! Pretty painting is always better than a Terminator Every week, new papers on Generative Adversarial Networks (GAN) are coming out and it's hard to keep track of them all, not to mention the incredibly creative ways in which researchers are naming these GANs!. In this setup, pairs of objects are given together with a measure of their similarity. showed how effective it is and also proposed a improved Triplet loss function which I have used for the experiments. The results are promising but I'm hoping for more. When we develop a model for probabilistic classification, we aim to map the model's inputs to probabilistic predictions, and we often train our model by incrementally adjusting the model's parameters so that our predictions get closer and closer to ground-truth probabilities. My idea was to use a pretrained classification model from Keras (e. Computes the triplet loss with semi-hard negative mining. Ye Yuan, Wuyang Chen, Yang Yang, Zhangyang Wang. Unfortunately, a prevailing belief in the community seems to be that the triplet loss is inferior to using surrogate losses. NN1 is a variation of AlexNet, the rest NN2 ,…, NNS2 are Inception net variants. We use triplet loss same as the one described in Wang et al. GitHub Gist: instantly share code, notes, and snippets. py -d market1501 -a resnet50 --max-epoch 60 --train-batch 32 --test-batch 32 --stepsize 20 --eval-step 20 --save-dir log. Maybe this is useful in my future work. of triplets during back propagation. md file to showcase the performance of the model. Unlike Softmax loss it is independent for each vector component (class), meaning that the loss computed for every CNN output vector component is not affected by other component values. If, for example, you only use 'hard triplets' (triplets where the a-n distance is smaller than the a-p distance), your network weights might collapse all embeddings to a single point (making the loss always equal to margin (your _alpha), because all embedding distances are zero). Cross-entropy loss for attributes, Euclidean loss for landmarks, triplet loss for pairs. Github Repositories Trend layumi/2016_person_re-ID Rank-1 89% (Single Query) on Market1501 with raw triplet loss, In Defense of the Triplet Loss for Person Re. TripletTorch. TristouNet is a neural network architecture based on Long Short-Term Memory recurrent networks, meant to project speech sequences into a fixed-dimensional euclidean space. The details of triplet loss is introduced in the Section II-B. Data Augmentation. And everything about model training is main_model_engine. The loss that is being minimized is then L = N å i h af(x i) f(x p i) 2 2 kf(xa) f(xn)k2 2 +a i +: (1) a is a margin that is enforced between positive and negative pairs. Siamese Network is a semi-supervised learning network which produces the embedding feature representation for the input. Triplet Loss. By carefully selecting the image pairs. The triplet defines a relative similarity between samples. As the training continues, more and more pairs/triplets are easy to deal with (their loss value is very small or even 0), preventing the network from training. Binary Cross-Entropy Loss. They further did ablation study on each component of the CycleGAN: without Cycle consistency; with only one direction of cycle consistency; without GAN loss and only cycle consitency. During back propagation, the three gradients will be summed and then passed through the embedder model ( deep learning book chapter 6 , Algorithm 6. View aliases. The course covers the basics of Deep Learning, with a focus on applications. So, given three images, A, P, and N, the anchor positive and negative examples. triplet_margin_loss(). Module backtesting. ; g_triplets_per_anchor: The number of real triplets per sample that should be passed into the generator. Here we will not follow this implementation and start from scratch. It provides simple way to create custom triplet datasets and common triplet mining loss techniques. [email protected] Google的人脸认证模型FaceNet(参考文献[2]), 不要求同类目标都靠近某个点，只要同类距离大于不同类间距离就行。完美的契合人脸认证的思想。 Batch All Triplet Loss. Large-Margin Softmax Loss for Convolutional Neural Networks all merits from softmax loss but also learns features with large angular margin between different classes. 0 / Keras, we can implement the Loss base class. Computer Standards & Interfaces, 2015, 42: 105-112. I trained that model with TensorFlow 2. Triplet-Center Loss for Multi-View 3D Object Retrieval. 在Pytorch中有一个类，已经定义好了triplet loss的criterion, class TripletMarginLoss(Module): class TripletMarginLoss(Module): r"""Creates a criterion that measures the triplet loss given an input tensors x1, x2, x3 and a margin with a value greater than 0. 0 ) where: Args: labels: 1-D tf. Benchmarks for different models and loss functions on various datasets. They further did ablation study on each component of the CycleGAN: without Cycle consistency; with only one direction of cycle consistency; without GAN loss and only cycle consitency. Explain Code! Everythin about data is running by main_data_engine. Badges are live and will be dynamically updated with the latest ranking of this paper. tained directly from optimizing SoftMax loss, which is pro-posed for classiﬁcation, perform well on the simple distance based tasks [22,30] and face recognition [2,9,10,27,28]. Mining functions come in two flavors: Subset Batch Miners take a batch of N embeddings and return a subset n to be used by a tuple miner, or directly by a loss function. Softmax loss is easy to optimize but does not explicitly encourage. GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together. “Improved deep metric learning with multi-class N-pair loss objective” proposes a way to handle the slow convergence problem of contrastive loss and triplet loss. The code structure is adapted from code I wrote for CS230 in this repository at tensorflow/vision. Used [combo loss] combinations of BCE, dice and focal. NN1 is a variation of AlexNet, the rest NN2 ,…, NNS2 are Inception net variants. facenet triplet loss with keras (2) I am trying to implement facenet in Keras with Thensorflow backend and I have some problem with the triplet loss. margin (float, optional) – margin for triplet loss. However, I don't understand why the distinction between the anchor and the positive still exists in the loss function. triplet loss 原理以及梯度推导 ; 3. 0 and I used Casia-WebFace as dataset. APPROACH We use a Lagrangian trajectory model to. VideoDataManager. Besides, our. Google的人脸认证模型FaceNet(参考文献[2]), 不要求同类目标都靠近某个点，只要同类距离大于不同类间距离就行。完美的契合人脸认证的思想。 Batch All Triplet Loss. Tuple Miners take a batch of n embeddings and return k pairs/triplets to be used for calculating the loss:. Default is 0. Biography I am a third-year Ph. Understanding Categorical Cross-Entropy Loss, Binary Cross-Entropy Loss, Softmax Loss, Logistic Loss, Focal Loss and all those confusing names. triplet_semihard_loss. Photo: Three Palms by Jamie Davies. Embeddings should be l2 normalized. Adam optimizer is used and the inital learning rate is set to 10 − 3 in the first 50 epoches. FaceNet Triplet Loss训练时数据是按顺序排好的3个一组3个一组。. py -d market1501 -a resnet50 --max-epoch 60 --train-batch 32 --test-batch 32 --stepsize 20 --eval-step 20 --save-dir log. Our loss function enforces the network to map each pixel in the image to an n-dimensional vector in feature space, such. It provides simple way to create custom triplet datasets and common triplet mining loss techniques. Inspired by this, several improvements to triplet selection have been proposed: (1) novel triplet selection methods,e. train_vid_model_xent_htri. A Simple Reparameterization to Accelerate Training of Deep Neural Networks:. 1-(b),(d)). Train network to one image size(224x224) and fine tune after for less epochs to larger size(448x448 for example) Train image detection network with image classification dataset. Documentation covering key assignments, settings, and related information for each system emulation module is linked to in the table of contents under "Emulation Module Documentation". Measuring distances between two images' encodings allows you to determine whether they are pictures of the same person. So the triplet loss minimises the distance between an anchor and a positive, both of which have the same identity, and maximises the distance between the anchor and a negative of a different identity. Loss-augmented inference To use the upper bound, we must solve: (g^; g^+; g^ ) = argmax (g;g+;g ) ‘ triplet g; g+; g + gT f(x) + g+T f(x+) + g T f(x ) There are 23q possible binary codes to maximize over. Deep Learning Face Representation from Predicting 10,000 Classes. [22] adopts triplet loss to supervise the embedding learning, leading to state-of-the-art face recognition results. eps (float, optional) – weight. \[L = max((1 - \alpha)\cdot min(D_{an}) - (1 + \alpha)\cdot max(D_{ap}) + m, 0)\] Next Previous. In particular, our model is able to capture rare instances and successfully colorize them. Deep metrics learning summary 1 minute read On this page. triplet_margin_loss(). from_logits (bool, default False) - Whether input is a log probability (usually from log_softmax) instead of unnormalized numbers. Here I would like to list some frequently-used loss functions and give my intuitive explanation. def batch_all_triplet_loss (labels, embeddings, margin, squared = False): ''' triplet loss of a batch ----- Args: labels: 标签数据，shape = （batch_size,） embeddings: 提取的特征向量， shape = (batch_size, vector_size) margin: margin大小， scalar Returns: triplet_loss: scalar, 一个batch的损失值 fraction_postive_triplets. In order to construct a model using the triplet loss, we can build an embedder model and then use that model three times in the triplet loss model. I like working on various complex problems in Machine learning and Deep Learning including … Home Read More ». Eng and Dr. However, the triplet loss pays main attentions on obtaining correct orders on the training set. ABD-Net: Attentive but Diverse Person Re-Identification. Goal of FaceNet • 다음을 만족하는 임베딩 함수를 찾는다 • Invariant • 표정, 조명, 얼굴 포즈 …. Triplet loss is a loss function for artificial neural networks where a baseline (anchor) input is compared to a positive (truthy) input and a negative (falsy) input. Unlike other approaches using triplet learning networks [20] [21] [22], our approach is fully-unsupervised and does not require additional label data for the triplets. One Shot learning, Siamese networks and Triplet Loss with Keras One Shot Learning" and using a specific loss function called the "Triplet Loss" code is available here on my github. GitHub - omoindrot/tensorflow-triplet-loss: Implementation of triplet loss in TensorFlow; mathgeekjp 2020-03-19 21:14. Our Supervised Triplet Network (a) is trained with triplets of images, a soft margin triplet loss is obtained from the triplets, and a softmax loss is obtained by utilizing each image and its label. positive: the embeddings for the positive images. Caffe中增加新的layer以及Caffe中triplet loss layer的实现 ; 6. 2，才跑没几下，这个 Loss 曲线就诡异的先猛的增大，之后突然降为 0 了。不知道为何？如下：. For example, to train an image reid model using ResNet50 and cross entropy loss, run python train_img_model_xent. This is used for measuring a relative similarity between samples. FaceNet: In the FaceNet paper, a convolutional neural network architecture is proposed. You can vote up the examples you like or vote down the ones you don't like. Despite significant recent advances in the field of face recognition, implementing face verification and recognition efficiently at scale presents serious challenges to current approaches. Main aliases. Loss functions are frequently used in supervised machine learning to minimize the differences between the predicted output of the model and the ground truth labels. NN S X networks are small. Triplet loss is designed to optimize the embedding space such that data points with the same label are closer to each other than those with different labels. It takes a triplet of variables as inputs, \(a\), \(p\) and \(n\): anchor, positive example and negative example respectively. ranking loss : they used hard-batch triplet loss and etc. 2, reduce='mean') [source] ¶ Computes triplet loss. Our approach, named CenterNet, detects each object as a triplet, rather than a pair, of keypoints, which improves both precision and recall. : LEARNING LOCAL FEATURE DESCRIPTORS WITH TRIPLETS We can categorise the loss functions that have been proposed in the literature for learning convolutional embeddings with triplets into two groups, the ranking-based losses and the ratio-based losses [12,21,23]. For deployment (b), the network is simpliﬁed to a single branch, since all weights are. Conclusion. org/rec/conf/ijcai. global descriptors for visual search. conv1 conv2 conv3 conv4 conv5 pose fc6&7 pose loc. , 2014] introduced Triplet Network by extend-ing the network input from a pair to a triplet (i. Triplet loss with semihard negative mining is now implemented in tf. com/lossless-triplet-loss-7e932f990b24. We demonstrate that it performs inferior in a clustering task. 09/11/2019 ∙ by Qi Qian, et al. Muhammad Haris received S. Triplet Loss Utility for Pytorch Library. GitHub Gist: instantly share code, notes, and snippets. Triplet loss is a loss function for artificial neural networks where a baseline (anchor) input is compared to a positive (truthy) input and a negative (falsy) input. Badges are live and will be dynamically updated with the latest ranking of this paper. BeamSearchDecoderOutput(scores, predicted_ids, parent_ids) View aliases. While triplet loss is the paper main focus, six embedding networks are evaluated. 02 Triplet Loss Layer could be a trick for further improving the accuracy of CNN. 0 is the nearly halved execution time as a result of more efficient image alignment for preprocessing and smaller neural network models. Doing online negative mining with triplet loss means we can "forego" manually indicating which candidates to compare to the query, saving us some headaches, and when the right hyperparameters are selected it usually keeps the loss more stable as well. 在Pytorch中有一个类，已经定义好了triplet loss的criterion, class TripletMarginLoss(Module): class TripletMarginLoss(Module): r"""Creates a criterion that measures the triplet loss given an input tensors x1, x2, x3 and a margin with a value greater than 0. triplet_loss gradient check. triplet_margin_loss() Examples The following are code examples for showing how to use torch. By carefully selecting the image pairs. It inspires us to investigate the formulation of SoftMax. student in National Laboratory of Pattern Recognition (NLPR), Institute of Automation Chinese Academy of Sciences (CASIA). So, given three images, A, P, and N, the anchor positive and negative examples. affiliations[ ![Heuritech](images/logo heuritech v2. \[L = max((1 - \alpha)\cdot min(D_{an}) - (1 + \alpha)\cdot max(D_{ap}) + m, 0)\] Next Previous. Ground-to-Aerial Image Geo-Localization With a Hard Exemplar Reweighting Triplet Loss Sudong Cai 1Yulan Guo2; Salman Khan3 Jiwei Hu4 Gongjian Wen1;2 1National University of Defense Technology 2Sun Yat-Sen University 3Inception Institute of Artiﬁcial Intelligence 4Wuhan University of Technology [email protected] The model will be trained with a triplet loss function (same as facenet or similar architectures).