def silent(input_filepath, threshold=<NUM_LIT>):
validate_input_file(input_filepath)<EOL>stat_dictionary = stat(input_filepath)<EOL>mean_norm = stat_dictionary['<STR_LIT>']<EOL>if mean_norm is not float('<STR_LIT>'):<EOL><INDENT>if mean_norm >= threshold:<EOL><INDENT>return False<EOL><DEDENT>else:<EOL><INDENT>return True<EOL><DEDENT><DEDENT>else:<EOL><INDENT>return True<EOL><DEDENT>
Determine if an input file is silent.

Parameters
----------
input_filepath : str
    The input filepath.
threshold : float
    Threshold for determining silence

Returns
-------
is_silent : bool
    True if file is determined silent.