Created by: JepsonWong

error message enhancement for Pool2D.

• check the input's type is Variable

import paddle.fluid as fluid
from paddle.fluid.dygraph import nn
import numpy as np

data = 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)
ret = pool2d(data)
TypeError: The type of 'input' in Pool2D must be <class 'paddle.fluid.framework.Variable'>, but received <type 'numpy.ndarray'>.

• check the input's dtype is in ['int8', 'uint8', 'float16', 'float32', 'float64']

import paddle.fluid as fluid
from paddle.fluid.dygraph import nn
import numpy as np

data = fluid.layers.data(name='x1', shape=[3, 32, 32, 5], dtype="int32")
pool2d = fluid.dygraph.Pool2D(
    pool_size=2,
    pool_type='max',
    pool_stride=1,
    global_pooling=False)
ret = pool2d(data)
TypeError: The data type of 'input' in Pool2D must be ['int8', 'uint8', 'float16', 'float32', 'float64'], but received int32.