“999d0fdbef0c18024c89c9a5eee309177dc4e160”上不存在“paddle/phi/kernels/bce_loss_grad_kernel.h”
* Expose paddle.framework by pybind11
* Export paddle.framework.{Scope, Variable} to paddle.v2.framework.core.
* See python/paddle/v2/framework/tests/test_scope.py for Python usage
* See paddle/pybind/pybind.cc for C++ bind code.
* add copyright