Add GetInputsElementDim (#6091)

Author: JiayiFeng

paddle/framework/shape_inference.cc

@@ -22,6 +22,12 @@ std::vector<framework::DDim> InferShapeContext::GetInputsDim(
   return GetDims(names);
 }
 
+DDim InferShapeContext::GetInputsElementDim(const std::string &name,
+                                            int idx) const {
+  const std::vector<std::string> &names = Inputs(name);
+  return this->GetDim(names[idx]);
+}
+
 void InferShapeContext::SetOutputsDim(
     const std::string &name, const std::vector<framework::DDim> &dims) {
   auto &names = Outputs(name);

paddle/framework/shape_inference.h

@@ -37,6 +37,7 @@ class InferShapeContext {
   virtual framework::DDim GetInputDim(const std::string &name) const = 0;
 
   std::vector<framework::DDim> GetInputsDim(const std::string &name) const;
+  DDim GetInputsElementDim(const std::string &name, int idx) const;
 
   virtual void SetOutputDim(const std::string &name, const DDim &dim) = 0;
   void SetOutputsDim(const std::string &name,

paddle/operators/while_op.cc

@@ -287,21 +287,21 @@ class WhileGradOpShapeInference : public framework::InferShapeBase {
 
     auto p_names = ctx->Inputs(kParameters);
     auto pg_names = ctx->Outputs(kParamGrads);
-    auto dims = ctx->GetInputsDim(kParameters);
     auto var_types = ctx->GetInputsVarType(kParameters);
     std::vector<std::string> names_to_set;
     std::vector<framework::DDim> dims_to_set;
     for (size_t i = 0; i < p_names.size(); ++i) {
       if (pg_names[i] == framework::kEmptyVarName) {
         continue;
       }
+      auto dims = ctx->GetInputsElementDim(kParameters, i);
       if (var_types[i] == framework::VarDesc::LOD_TENSOR) {
         names_to_set.push_back(pg_names[i]);
-        dims_to_set.push_back(dims[i]);
+        dims_to_set.push_back(dims);
       } else if (var_types[i] == framework::VarDesc::LOD_TENSOR_ARRAY) {
         // not sure how to set the dim of LOD_TENSOR_ARRAY
         names_to_set.push_back(pg_names[i]);
-        dims_to_set.push_back(dims[i]);
+        dims_to_set.push_back(dims);
       }
     }
     ctx->SetDims(names_to_set, dims_to_set);