Enhance error msg of imperative code (#23572)

* fix init_gflags with 'python -c', test=develop

* enhance error msg related Tracer, test=develop

* refine err msg, test=develop

* follow comments, test=develop

paddle/fluid/imperative/layer.cc

@@ -41,7 +41,9 @@ void ThreadSafeNameSet::Insert(const std::string& name) {
 void ThreadSafeNameSet::Remove(const std::string& name) {
   std::lock_guard<std::mutex> guard(mtx_);
   auto iter = set_.find(name);
-  PADDLE_ENFORCE_EQ(iter != set_.end(), true, "%s does not exist", name);
+  PADDLE_ENFORCE_EQ(
+      iter != set_.end(), true,
+      platform::errors::NotFound("Variable name %s does not exist", name));
   set_.erase(iter);
 }
 
@@ -54,48 +56,6 @@ ThreadSafeNameSet VarBase::name_set_;
 
 std::vector<std::string> VarBase::AliveVarNames() { return name_set_.Names(); }
 
-static framework::VariableNameMap CreateVarNameMap(
-    const framework::OpInfo& op_info, const std::string& op_type,
-    const NameVarBaseMap& varbase_map, bool is_input) {
-  if (op_info.proto_ == nullptr) {
-    framework::VariableNameMap result;
-
-    for (auto& it : varbase_map) {
-      auto& var_vector = it.second;
-      std::vector<std::string> args;
-      args.reserve(var_vector.size());
-      for (auto& var_base : var_vector) {
-        args.emplace_back(var_base->Name());
-      }
-      result[it.first] = std::move(args);
-    }
-    return result;
-  }
-
-  framework::VariableNameMap result;
-
-  for (auto& var :
-       is_input ? op_info.Proto().inputs() : op_info.Proto().outputs()) {
-    auto it = varbase_map.find(var.name());
-    if (it == varbase_map.end()) {
-      PADDLE_ENFORCE_EQ(
-          var.dispensable(), true,
-          "Var: %s not dispensable and there are no such var in inputs",
-          var.name());
-      result[var.name()] = {};
-    } else {
-      auto& var_vector = it->second;
-      std::vector<std::string> args;
-      args.reserve(var_vector.size());
-      for (auto& var_base : var_vector) {
-        args.emplace_back(var_base->Name());
-      }
-      result[var.name()] = std::move(args);
-    }
-  }
-  return result;
-}
-
 static framework::RuntimeContext PrepareRuntimeContext(
     const NameVarBaseMap& ins, const NameVarBaseMap& outs) {
   framework::VariableValueMap inputs, outputs;
@@ -323,7 +283,9 @@ static void OpBaseRunImpl(const framework::OperatorBase& op,
                           const framework::AttributeMap& attrs,
                           const platform::Place& place) {
   auto* op_kernel = dynamic_cast<const framework::OperatorWithKernel*>(&op);
-  PADDLE_ENFORCE_NOT_NULL(op_kernel, "only support op with kernel");
+  PADDLE_ENFORCE_NOT_NULL(
+      op_kernel, platform::errors::PermissionDenied(
+                     "Only support operator with kernel in Dygraph mode."));
   auto& info = op.Info();
   if (info.infer_var_type_) {
     RuntimeInferVarTypeContext<VarType> infer_var_type_ctx(ins, outs, attrs);

paddle/fluid/imperative/prepared_operator.cc

@@ -95,11 +95,12 @@ PreparedOp PrepareOpImpl(const NameVarMap<VarType>& ins,
   // check if op[type] has kernel registered.
   auto& all_op_kernels = op.AllOpKernels();
   auto kernels_iter = all_op_kernels.find(op.Type());
-  if (kernels_iter == all_op_kernels.end()) {
-    PADDLE_THROW(
-        "There are no kernels which are registered in the %s operator.",
-        op.Type());
-  }
+
+  PADDLE_ENFORCE_NE(
+      kernels_iter, all_op_kernels.end(),
+      platform::errors::NotFound(
+          "There are no kernels which are registered in the %s operator.",
+          op.Type()));
 
   auto& kernels = kernels_iter->second;
 
@@ -111,10 +112,10 @@ PreparedOp PrepareOpImpl(const NameVarMap<VarType>& ins,
 
   auto kernel_iter = kernels.find(expected_kernel_key);
   // TODO(jiabin): Add operator.cc's line 1000 part back when we need that case
-  if (kernel_iter == kernels.end()) {
-    PADDLE_THROW("op %s does not have kernel for %s", op.Type(),
-                 KernelTypeToString(expected_kernel_key));
-  }
+  PADDLE_ENFORCE_NE(kernel_iter, kernels.end(),
+                    platform::errors::NotFound(
+                        "Operator %s does not have kernel for %s.", op.Type(),
+                        KernelTypeToString(expected_kernel_key)));
 
   if (!(expected_kernel_key.place_ == place)) {
     dev_ctx = pool.Get(expected_kernel_key.place_);

paddle/fluid/imperative/tests/test_prepare_op.cc

@@ -68,8 +68,9 @@ static framework::VariableNameMap CreateVarNameMap(
     if (it == varbase_map.end()) {
       PADDLE_ENFORCE_EQ(
           var.dispensable(), true,
-          "Var: %s not dispensable and there are no such var in inputs",
-          var.name());
+          platform::errors::NotFound("Variable %s is not dispensable and "
+                                     "there are no such var in inputs",
+                                     var.name()));
       result[var.name()] = {};
     } else {
       auto& var_vector = it->second;

paddle/fluid/pybind/imperative.cc

@@ -101,7 +101,8 @@ static void InitVarBaseFromNumpyWithKwargs(imperative::VarBase *self,
                                            const py::kwargs &kwargs) {
   PADDLE_ENFORCE_EQ(
       kwargs.contains("value"), true,
-      platform::errors::InvalidArgument("Missing argument: value"));
+      platform::errors::NotFound(
+          "The kwargs used to create Varbase misses argument: value"));
 
   auto persistable = kwargs.contains("persistable")
                          ? kwargs["persistable"].cast<bool>()
@@ -158,7 +159,8 @@ static T PyObjectCast(PyObject *obj) {
   try {
     return py::cast<T>(py::handle(obj));
   } catch (py::cast_error &) {
-    PADDLE_THROW("Python object is not type of %s", typeid(T).name());
+    PADDLE_THROW(platform::errors::InvalidArgument(
+        "Python object is not type of %s", typeid(T).name()));
   }
 }
 
@@ -212,8 +214,9 @@ static imperative::NameVarBaseMap ConvertToNameVarBaseMap(
     }
   }
 
-  PADDLE_ENFORCE_EQ(PyErr_Occurred() == nullptr, true,
-                    py::str(py::handle(PyErr_Occurred())));
+  PADDLE_ENFORCE_EQ(
+      PyErr_Occurred(), nullptr,
+      platform::errors::InvalidArgument(py::str(py::handle(PyErr_Occurred()))));
   return result;
 }
 
@@ -503,7 +506,7 @@ void BindImperative(py::module *m_ptr) {
              PADDLE_ENFORCE_EQ(
                  tensor.IsInitialized(), true,
                  platform::errors::InvalidArgument(
-                     "%s is Empty, Please check if it has no data in",
+                     "Tensor of %s is Empty, please check if it has no data.",
                      self.Name()));
              return TensorToPyArray(tensor, true);
            },