Return a Numpy array from a Pandas dataframe.

    Iterating over a DataFrame has weird side effects, such as the first
    row being the column names. Converting to Numpy is more safe.

def if_pandas_df_convert_to_numpy(obj):
    """Return a Numpy array from a Pandas dataframe.

    Iterating over a DataFrame has weird side effects, such as the first
    row being the column names. Converting to Numpy is more safe.
    """
    if pd is not None and isinstance(obj, pd.DataFrame):
        return obj.values
    else:
        return obj