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hi @jcwchen Thanks for your suggestion! I tested this approach, and find that if I specify input names as `['xx1', 'xx2', 'xx3', 'xx4']`, my exported model would have input names...

Thanks for the comment! @max-sixty A typical use case for `ignore_na=True` is when we have a dataframe which has different nan locations for different columns, e.g. `df = pd.DataFrame({'a': pd.Series([0,np.nan,...