4 Commits (7f1ad510bd5df6093767ab65817bd2f9cd970a7f)

Author	SHA1	Message	Date
Huihuang Zheng	1dcf6a7212	Add Much Complex Test and Fix Bugs for Control Flow cond API (#21532) ... Add tests to use dy/dx to make sure the gradient values calculated by the control flow backward is correct. Also fixed bugs detected by those tests. Fix bugs: 1. Unlike sum_op, optimizer ops don't allow uninitialized input tensor. But in conditional_block_grad_op, since the conditional_block may not run, the output gradient tensor may be uninitialized, which will cause the optimizer op error. To fix it, we should let optimizer ops support uninitialized input like sum_op or assign the uninitialized gradient to 0 when the conditional_block_grad_op doesn't run. I found there are about 10+ optimizer ops. **To be simpler, I just assign output gradient of the conditional_block_grad_op to 0 in this PR**. But it can be further explored whether we can make optimizer ops like sum_op to support uninitialized input tensor because theoretically we can speed up without the assigning in conditional_block_grad_op. 2. Infer parameter shapes during append_backward. I didn't know that all our parameters are in global block. When op_desc is inferring shapes at the sub-block, it may not know the shape of gradients of parameters whose shape information is at global block. I fixed it by inferring shapes of gradients from forward var. This PR also did some code clean up: 1. Print the var name when sgd_op catches shape error so that it is easier to debug 2. Fix a typo: dicta -> dict	7 years ago
Zeng Jinle	0436efd6a3	Unify DataLoader APIs (#19305) ... * unify DataLoader APIs, test=develop * integrate iterable CPU Dataset, test=develop add GPU dataset supporting, test=develop * add unittests for dataset, test=develop * add more docs to dataloader apis, test=develop, test=document_preview * refine doc, test=develop * refine doc again, test=develop * increase coverage, test=develop	7 years ago
chengduo	fd3aad6cb3	Make fuse_optimizer_op_pass also work when the model contains sparse gradients. (#18664) ... * support sparse gradients test=develop	7 years ago
chengduo	ea8655dbd2	Add unit test for fuse_opt_ops (#16550) ... * add unit test for fuse_opt_ops test=develop	7 years ago