AutoencoderKlMaisi input num_splits default value may cause unexpected error

Is your feature request related to a problem? Please describe.
If not given, input num_splits of AutoencoderKlMaisi is set as 16 by default.

This will cause error for input image size like [128,128,128] for a 3 level model.

RuntimeError: Calculated padded input size per channel: (2 x 34 x 34). Kernel size: (3 x 3 x 3). Kernel size can’t be greater than actual input size.

Users may be confused by the error and do not know that the key issue is from num_splits.

Describe the solution you'd like
Change the default value of num_splits to 1, or add docstring or value check to guide the users to tune this parameter.

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
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