Created by: zhupengyang

• 为concat python api的输入x加类型检查：

  • 检查类型是否为Variable
  • 检查数据类型是否为float16(gpu only), float32, float64, int32, int64
  • 在单测中覆盖类型错误和数据类型错误两个异常情况

• 为concat op的输入加shape检查

测试样例：

import paddle.fluid as fluid
import numpy as np

in1 = np.array([[1,2,3],
                [4,5,6]])
in2 = np.array([[1,2],
                [3,4],
                [5,6]])
with fluid.dygraph.guard():
    x1 = fluid.dygraph.to_variable(in1)
    x2 = fluid.dygraph.to_variable(in2)
    out = fluid.layers.concat(input=[x1,x2], axis=0)
    print(out.numpy())

修改前的报错信息：

Input tensors should have the same elements except the specify axis

修改后的报错信息：

Input tensors should have same dimensions(or specific dimension = -1) except the axis. But recevied axis = 0, input[0]'s shape = [2, 3], input[1]'s shape = [3, 2], the "1" dimension of input[1] is unexpected