to enhance this function with padding function.

[todo]

rising/rising/transforms/crop.py

Lines 27 to 32 in 1e2dd67

	todo: to enhance this function with padding function.
	"""
	def __init__(
	self,
	size: Union[int, Sequence, AbstractParameter],

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This issue was generated by todo based on a todo comment in 1e2dd67 when #7 was merged. cc @jizongFox.