error message enhancement for Pool2D, test=develop (#23607)

python/paddle/fluid/dygraph/nn.py

@@ -838,6 +838,10 @@ class Pool2D(layers.Layer):
                      'use_mkldnn', False, 'exclusive', self._exclusive)
             return core.ops.pool2d(input, *attrs)
 
+        check_variable_and_dtype(
+            input, 'input', ['int8', 'uint8', 'float16', 'float32', 'float64'],
+            'Pool2D')
+
         attrs = {
             "pooling_type": self._pool_type,
             "ksize": self._pool_size,

python/paddle/fluid/tests/unittests/test_pool2d_op.py

@@ -21,6 +21,7 @@ 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
 
 
 def adaptive_start_index(index, input_size, output_size):
@@ -1275,5 +1276,25 @@ class TestPool2dAPI_Error(unittest.TestCase):
         self.assertRaises(ValueError, run_5)
 
 
+class TestDygraphPool2DAPIError(unittest.TestCase):
+    def test_errors(self):
+        with program_guard(Program(), Program()):
+            # the input of Pool2D must be Variable.
+            data1 = np.random.random((3, 32, 32, 5)).astype('float32')
+            pool2d = fluid.dygraph.Pool2D(
+                pool_size=2,
+                pool_type='max',
+                pool_stride=1,
+                global_pooling=False)
+            self.assertRaises(TypeError, pool2d, data1)
+
+            # the input dtype of Pool2D must be uint8 or int8 or float16 or float32 or float64
+            # uint8 and int8 only can be set on mkldnn
+            # float16 only can be set on GPU place
+            data2 = fluid.layers.data(
+                name='x1', shape=[3, 32, 32, 5], dtype="int32")
+            self.assertRaises(TypeError, pool2d, data2)
+
+
 if __name__ == '__main__':
     unittest.main()