enhance mul_op input error message test=develop (#20414)

* enhance mul_op input error message test=develop

paddle/fluid/operators/mul_op.cc

@@ -32,9 +32,11 @@ class MulOp : public framework::OperatorWithKernel {
   using framework::OperatorWithKernel::OperatorWithKernel;
 
   void InferShape(framework::InferShapeContext* ctx) const override {
-    PADDLE_ENFORCE(ctx->HasInput("X"), "Input(X) of MulOp should not be null.");
-    PADDLE_ENFORCE(ctx->HasInput("Y"), "Input(Y) of MulOp should not be null.");
-    PADDLE_ENFORCE(ctx->HasOutput("Out"),
+    PADDLE_ENFORCE_EQ(ctx->HasInput("X"), true,
+                      "Input(X) of MulOp should not be null.");
+    PADDLE_ENFORCE_EQ(ctx->HasInput("Y"), true,
+                      "Input(Y) of MulOp should not be null.");
+    PADDLE_ENFORCE_EQ(ctx->HasOutput("Out"), true,
                       "Output(Out) of MulOp should not be null.");
 
     auto x_dims = ctx->GetInputDim("X");

python/paddle/fluid/layers/nn.py

@@ -14352,6 +14352,23 @@ def mul(x, y, x_num_col_dims=1, y_num_col_dims=1, name=None):
 
     helper = LayerHelper("mul", **locals())
 
+    if not isinstance(x, Variable):
+        raise TypeError(
+            "The type of 'x' in mul must be Variable, but received %s" %
+            (type(x)))
+    if not isinstance(y, Variable):
+        raise TypeError(
+            "The type of 'y' in mul must be Variable, but received %s" %
+            (type(y)))
+    if convert_dtype(x.dtype) not in ['float32', 'float64']:
+        raise TypeError(
+            "The data type of 'x' in mul must be float32 or float64, but received %s."
+            % (convert_dtype(x.dtype)))
+    if convert_dtype(y.dtype) not in ['float32', 'float64']:
+        raise TypeError(
+            "The data type of 'y' in softmax must be float32 or float64, but received %s."
+            % (convert_dtype(y.dtype)))
+
     if name is None:
         out = helper.create_variable_for_type_inference(dtype=x.dtype)
     else:

python/paddle/fluid/tests/unittests/test_mul_op.py

@@ -18,6 +18,8 @@ import unittest
 import numpy as np
 import paddle.fluid.core as core
 from op_test import OpTest
+import paddle.fluid as fluid
+from paddle.fluid import Program, program_guard
 
 
 class TestMulOp(OpTest):
@@ -49,6 +51,21 @@ class TestMulOp(OpTest):
             ['X'], 'Out', max_relative_error=0.5, no_grad_set=set('Y'))
 
 
+class TestMulOpError(OpTest):
+    def test_errors(self):
+        with program_guard(Program(), Program()):
+            # The input type of mul_op must be Variable.
+            x1 = fluid.create_lod_tensor(
+                np.array([[-1]]), [[1]], fluid.CPUPlace())
+            x2 = fluid.create_lod_tensor(
+                np.array([[-1]]), [[1]], fluid.CPUPlace())
+            self.assertRaises(TypeError, fluid.layers.mul, x1, x2)
+            # The input dtype of mul_op must be float32 or float64.
+            x3 = fluid.layers.data(name='x3', shape=[4], dtype="int32")
+            x4 = fluid.layers.data(name='x4', shape=[4], dtype="int32")
+            self.assertRaises(TypeError, fluid.layers.mul, x3, x4)
+
+
 class TestMulOp2(OpTest):
     def setUp(self):
         self.op_type = "mul"