Merge pull request #6623 from JiayiFeng/dev_expose_GradOpMaker

Expose GradOpMaker to Python

paddle/pybind/pybind.cc

@@ -282,6 +282,23 @@ All parameter, weight, gradient are variables in Paddle.
     }
     return ret_values;
   });
+  m.def("get_grad_op_descs",
+        [](const OpDescBind &op_desc,
+           const std::unordered_set<std::string> &no_grad_set,
+           std::unordered_map<std::string, std::string> &grad_to_var,
+           const std::vector<BlockDescBind *> &grad_sub_block) {
+          std::vector<std::unique_ptr<OpDescBind>> grad_op_descs =
+              framework::OpInfoMap::Instance()
+                  .Get(op_desc.Type())
+                  .GradOpMaker()(op_desc, no_grad_set, &grad_to_var,
+                                 grad_sub_block);
+          std::vector<OpDescBind *> grad_op_desc_ptrs(grad_op_descs.size());
+          std::transform(
+              grad_op_descs.begin(), grad_op_descs.end(),
+              grad_op_desc_ptrs.begin(),
+              [](std::unique_ptr<OpDescBind> &p) { return p.release(); });
+          return grad_op_desc_ptrs;
+        });
   m.def("prune", [](const ProgramDescBind &origin,
                     const std::vector<std::array<size_t, 2>> &targets) {
     ProgramDescBind prog_with_targets(origin);