Created by: zhiqiu

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PR changes

APIs

Describe

Enhance paddle.squeeze

• Update signature
  paddle.squeeze(input, axes, out=None, name=None) -> paddle.squeeze(x, axis=None, name=None)
• Support None, int, and list for axis
• Return x unchanged if its shape is [A, 1, B, 1] and axis is 0 instead of raising exception
• Code clean