normal不支持fp16

[linjieccc]

bug描述 Describe the Bug

import paddle

paddle.set_default_dtype("float16")

paddle.tensor.normal(
    mean=0.0,
    std=0.02,
    shape=[10, 10]
)

Traceback:

  File "/usr/local/lib/python3.7/dist-packages/paddle/tensor/random.py", line 473, in normal
    return gaussian(shape=shape, mean=mean, std=std, name=name)
  File "/usr/local/lib/python3.7/dist-packages/paddle/tensor/random.py", line 241, in gaussian
    .format(op_type_for_check, dtype))
TypeError: gaussian/standard_normal/randn/normal only supports [float32, float64], but the default dtype is float16

其他补充信息 Additional Supplementary Information

No response

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