4 Star 12 Fork 0

PaddlePaddle / PLSC

加入 Gitee
与超过 1200万 开发者一起发现、参与优秀开源项目,私有仓库也完全免费 :)
免费加入
克隆/下载
贡献代码
同步代码
取消
提示: 由于 Git 不支持空文件夾,创建文件夹后会生成空的 .keep 文件
Loading...
README
Apache-2.0

PLSC: 飞桨大规模分类库

简介

深度学习中用于解决多分类问题的深度神经网络的最后一层通常是全连接层和Softmax的组合层,并采用交叉熵(Cross-Entropy)算法计算神经网络的损失函数。由于全连接层的参数量随着分类类别数的增长线性增长,当分类类别数相当大时,神经网络的训练会面临下面两个主要挑战:

  1. 参数量过大,超出单个GPU卡的显存容量:假设分类网络最后一层隐层的输出维度为512,那么当分类类别数为一百万时,最后一层全连接层参数的大小约为2GB(假设以32比特浮点数表示参数)。当分类问题的类别数为一亿时(例如,对自然界中的生物进行分类),则最后一层全连接层参数的大小接近200GB,远远超过当前GPU的显存容量。

  2. 参数量较大,同步训练方式下通信开销较大:数据并行训练方式下,所有GPU卡之间需要同步参数的梯度信息,以完成参数值的同步更新。当参数数量较大时,参数的梯度信息数据量同样较大,从而导致参数梯度信息的通信开销较大,影响训练速度。

考虑到全接连层的线性可分性,可以将全连接层参数切分到多张GPU卡,减少每张GPU卡的参数存储量。

以下图为例,全连接层参数按行切分到不同的GPU卡上。每次训练迭代过程中,各张GPU卡分别以各自的训练数据计算隐层的输出特征,并通过集合通信操作AllGather得到汇聚后的特征。接着,各张GPU卡以汇聚后的特征和部分全连接层参数计算部分logit值(partial logit),并基于此计算神经网络的损失值。

overview

飞桨大规模分类(PLSC: PaddlePaddle Large Scale Classification)库是基于飞桨平台构建的超大规模分类库,为用户提供从训练到部署的大规模分类问题全流程解决方案。

PLSC特性

  • 支持超大规模分类:单机8张V100 GPU配置下支持的最大类别数扩大2.52倍,支持的类别数随GPU卡数的增加而增加;
  • 训练速度快:单机8张V100 GPU配置下,基于ResNet50模型的百万类别分类训练速度2,122.56 images/s, 并支持多机分布式训练和混合精度训练;
  • 支持训练卡数的调整:加载模型参数的热启动训练可以使用和预训练不同的GPU卡数,并自动进行参数转换;
  • base64格式图像数据预处理:提供base64格式图像数据的预处理,包括数据的全局shuffle,数据自动切分;
  • 支持自定义模型:PLSC内建ResNet50、ResNet101和ResNet152模型,并支持用户自定义模型;
  • 支持模型参数在HDFS文件系统的自动上传和下载;
  • 全流程解决方案:提供从训练到部署的大规模分类问题全流程解决方案。

快速开始

请参考快速开始获取安装指南和快速使用示例。

预测部署

请参考预测部署指南获取预测部署使用指南。

高阶功能

请参考进阶指南获取更多高阶功能的使用指南,如HDFS文件系统的自动上传和下载等。

API参考

请参考API参考获取API使用信息。

预训练模型和性能

预训练模型

我们提供了下面的预训练模型,以帮助用户对下游任务进行fine-tuning。

模型 描述
resnet50_distarcface_ms1m_arcface 该模型使用ResNet50网络训练,数据集为MS1M-ArcFace,训练阶段使用的loss_type为'dist_arcface',预训练模型在lfw验证集上的验证精度为0.99817。

训练精度

模型 训练集 lfw agendb_30 cfp_ff cfp_fp MegaFace (Id/Ver)
ResNet50 MS1M-ArcFace 0.99817 0.99827 0.99857 0.96314 0.98000/0.99300
ResNet50 CASIA 0.98950 0.90950 0.99057 0.91500 N/A

备注:上述模型训练使用的loss_type为'dist_arcface'。更多关于ArcFace的内容请参考ArcFace: Additive Angular Margin Loss for Deep Face Recognition

Apache License Version 2.0, January 2004 http://www.apache.org/licenses/ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 1. Definitions. "License" shall mean the terms and conditions for use, reproduction, and distribution as defined by Sections 1 through 9 of this document. "Licensor" shall mean the copyright owner or entity authorized by the copyright owner that is granting the License. "Legal Entity" shall mean the union of the acting entity and all other entities that control, are controlled by, or are under common control with that entity. For the purposes of this definition, "control" means (i) the power, direct or indirect, to cause the direction or management of such entity, whether by contract or otherwise, or (ii) ownership of fifty percent (50%) or more of the outstanding shares, or (iii) beneficial ownership of such entity. "You" (or "Your") shall mean an individual or Legal Entity exercising permissions granted by this License. "Source" form shall mean the preferred form for making modifications, including but not limited to software source code, documentation source, and configuration files. "Object" form shall mean any form resulting from mechanical transformation or translation of a Source form, including but not limited to compiled object code, generated documentation, and conversions to other media types. "Work" shall mean the work of authorship, whether in Source or Object form, made available under the License, as indicated by a copyright notice that is included in or attached to the work (an example is provided in the Appendix below). "Derivative Works" shall mean any work, whether in Source or Object form, that is based on (or derived from) the Work and for which the editorial revisions, annotations, elaborations, or other modifications represent, as a whole, an original work of authorship. For the purposes of this License, Derivative Works shall not include works that remain separable from, or merely link (or bind by name) to the interfaces of, the Work and Derivative Works thereof. "Contribution" shall mean any work of authorship, including the original version of the Work and any modifications or additions to that Work or Derivative Works thereof, that is intentionally submitted to Licensor for inclusion in the Work by the copyright owner or by an individual or Legal Entity authorized to submit on behalf of the copyright owner. For the purposes of this definition, "submitted" means any form of electronic, verbal, or written communication sent to the Licensor or its representatives, including but not limited to communication on electronic mailing lists, source code control systems, and issue tracking systems that are managed by, or on behalf of, the Licensor for the purpose of discussing and improving the Work, but excluding communication that is conspicuously marked or otherwise designated in writing by the copyright owner as "Not a Contribution." "Contributor" shall mean Licensor and any individual or Legal Entity on behalf of whom a Contribution has been received by Licensor and subsequently incorporated within the Work. 2. Grant of Copyright License. Subject to the terms and conditions of this License, each Contributor hereby grants to You a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare Derivative Works of, publicly display, publicly perform, sublicense, and distribute the Work and such Derivative Works in Source or Object form. 3. Grant of Patent License. Subject to the terms and conditions of this License, each Contributor hereby grants to You a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable (except as stated in this section) patent license to make, have made, use, offer to sell, sell, import, and otherwise transfer the Work, where such license applies only to those patent claims licensable by such Contributor that are necessarily infringed by their Contribution(s) alone or by combination of their Contribution(s) with the Work to which such Contribution(s) was submitted. If You institute patent litigation against any entity (including a cross-claim or counterclaim in a lawsuit) alleging that the Work or a Contribution incorporated within the Work constitutes direct or contributory patent infringement, then any patent licenses granted to You under this License for that Work shall terminate as of the date such litigation is filed. 4. Redistribution. You may reproduce and distribute copies of the Work or Derivative Works thereof in any medium, with or without modifications, and in Source or Object form, provided that You meet the following conditions: (a) You must give any other recipients of the Work or Derivative Works a copy of this License; and (b) You must cause any modified files to carry prominent notices stating that You changed the files; and (c) You must retain, in the Source form of any Derivative Works that You distribute, all copyright, patent, trademark, and attribution notices from the Source form of the Work, excluding those notices that do not pertain to any part of the Derivative Works; and (d) If the Work includes a "NOTICE" text file as part of its distribution, then any Derivative Works that You distribute must include a readable copy of the attribution notices contained within such NOTICE file, excluding those notices that do not pertain to any part of the Derivative Works, in at least one of the following places: within a NOTICE text file distributed as part of the Derivative Works; within the Source form or documentation, if provided along with the Derivative Works; or, within a display generated by the Derivative Works, if and wherever such third-party notices normally appear. The contents of the NOTICE file are for informational purposes only and do not modify the License. You may add Your own attribution notices within Derivative Works that You distribute, alongside or as an addendum to the NOTICE text from the Work, provided that such additional attribution notices cannot be construed as modifying the License. You may add Your own copyright statement to Your modifications and may provide additional or different license terms and conditions for use, reproduction, or distribution of Your modifications, or for any such Derivative Works as a whole, provided Your use, reproduction, and distribution of the Work otherwise complies with the conditions stated in this License. 5. Submission of Contributions. Unless You explicitly state otherwise, any Contribution intentionally submitted for inclusion in the Work by You to the Licensor shall be under the terms and conditions of this License, without any additional terms or conditions. Notwithstanding the above, nothing herein shall supersede or modify the terms of any separate license agreement you may have executed with Licensor regarding such Contributions. 6. Trademarks. This License does not grant permission to use the trade names, trademarks, service marks, or product names of the Licensor, except as required for reasonable and customary use in describing the origin of the Work and reproducing the content of the NOTICE file. 7. Disclaimer of Warranty. Unless required by applicable law or agreed to in writing, Licensor provides the Work (and each Contributor provides its Contributions) on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied, including, without limitation, any warranties or conditions of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A PARTICULAR PURPOSE. You are solely responsible for determining the appropriateness of using or redistributing the Work and assume any risks associated with Your exercise of permissions under this License. 8. Limitation of Liability. In no event and under no legal theory, whether in tort (including negligence), contract, or otherwise, unless required by applicable law (such as deliberate and grossly negligent acts) or agreed to in writing, shall any Contributor be liable to You for damages, including any direct, indirect, special, incidental, or consequential damages of any character arising as a result of this License or out of the use or inability to use the Work (including but not limited to damages for loss of goodwill, work stoppage, computer failure or malfunction, or any and all other commercial damages or losses), even if such Contributor has been advised of the possibility of such damages. 9. Accepting Warranty or Additional Liability. While redistributing the Work or Derivative Works thereof, You may choose to offer, and charge a fee for, acceptance of support, warranty, indemnity, or other liability obligations and/or rights consistent with this License. However, in accepting such obligations, You may act only on Your own behalf and on Your sole responsibility, not on behalf of any other Contributor, and only if You agree to indemnify, defend, and hold each Contributor harmless for any liability incurred by, or claims asserted against, such Contributor by reason of your accepting any such warranty or additional liability. END OF TERMS AND CONDITIONS APPENDIX: How to apply the Apache License to your work. To apply the Apache License to your work, attach the following boilerplate notice, with the fields enclosed by brackets "[]" replaced with your own identifying information. (Don't include the brackets!) The text should be enclosed in the appropriate comment syntax for the file format. We also recommend that a file or class name and description of purpose be included on the same "printed page" as the copyright notice for easier identification within third-party archives. Copyright [yyyy] [name of copyright owner] Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

简介

飞桨大规模分类(PLSC: PaddlePaddle Large Scale Classification)库是基于飞桨平台构建的超大规模分类库,为用户提供从训练到部署的大规模分类问题全流程解决方案 展开 收起
Python 等 2 种语言
Apache-2.0
取消

发行版

暂无发行版

贡献者

全部

近期动态

加载更多
不能加载更多了
Python
1
https://gitee.com/paddlepaddle/PLSC.git
git@gitee.com:paddlepaddle/PLSC.git
paddlepaddle
PLSC
PLSC
master

搜索帮助

14c37bed 8189591 565d56ea 8189591