The problem about constraint of group convolution in develop version.
Created by: yukavio
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- 版本、环境信息 1）PaddlePaddle版本：develop 2）CPU/GPU：cuda 9.0 3）系统环境：linux 注：您可以通过执行summary_env.py获取以上信息。
- 建议描述：Paddle卷积操作要求分组卷积中num_filters可以被groups整除，但pytorch中无此要求。
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