keras/src/layers/reshaping/zero_padding1d.py/ZeroPadding1D/__init__
class ZeroPadding1D:    def __init__(self, padding=1, **kwargs):
        super().__init__(**kwargs)
        self.padding = argument_validation.standardize_tuple(
            padding, 2, "padding", allow_zero=True
        )
        self.input_spec = InputSpec(ndim=3)