def abs_df(spreadsheet_df):
    """ Basic transformation dataframe to dataframe: absolute value of input spreadsheet.

    Args:
        spreadsheet_df: normal orientation is genes (features aka rows) X samples (columns).

    Returns:
        abs_df:         same rows and columns with magnitude of all values.
    """
    abs_df = spreadsheet_df.copy()
    return abs_df.abs()