How to use the textdistance.algorithms.compression_based._BinaryNCDBase function in textdistance

assert entropy >= 0
        return entropy

        # # redundancy:
        # unique_count = len(counter)
        # absolute_entropy = math.log(unique_count, 2) / unique_count
        # return absolute_entropy - entropy / unique_count

    def _get_size(self, data):
        return self.coef + self._compress(data)


# -- BINARY COMPRESSORS -- #


class BZ2NCD(_BinaryNCDBase):
    """
    https://en.wikipedia.org/wiki/Bzip2
    """
    def _compress(self, data):
        return codecs.encode(data, 'bz2_codec')[15:]


class LZMANCD(_BinaryNCDBase):
    """
    https://en.wikipedia.org/wiki/LZMA
    """
    def _compress(self, data):
        if not lzma:
            raise ImportError('Please, install the PylibLZMA module')
        return lzma.compress(data)[14:]

"""
    def _compress(self, data):
        return codecs.encode(data, 'bz2_codec')[15:]


class LZMANCD(_BinaryNCDBase):
    """
    https://en.wikipedia.org/wiki/LZMA
    """
    def _compress(self, data):
        if not lzma:
            raise ImportError('Please, install the PylibLZMA module')
        return lzma.compress(data)[14:]


class ZLIBNCD(_BinaryNCDBase):
    """
    https://en.wikipedia.org/wiki/Zlib
    """
    def _compress(self, data):
        return codecs.encode(data, 'zlib_codec')[2:]


arith_ncd = ArithNCD()
bwtrle_ncd = BWTRLENCD()
bz2_ncd = BZ2NCD()
lzma_ncd = LZMANCD()
rle_ncd = RLENCD()
zlib_ncd = ZLIBNCD()
sqrt_ncd = SqrtNCD()
entropy_ncd = EntropyNCD()

def __call__(self, *sequences):
        if not sequences:
            return 0
        if isinstance(sequences[0], string_types):
            sequences = [s.encode('utf-8') for s in sequences]
        return super(_BinaryNCDBase, self).__call__(*sequences)

def _get_size(self, data):
        return self.coef + self._compress(data)


# -- BINARY COMPRESSORS -- #


class BZ2NCD(_BinaryNCDBase):
    """
    https://en.wikipedia.org/wiki/Bzip2
    """
    def _compress(self, data):
        return codecs.encode(data, 'bz2_codec')[15:]


class LZMANCD(_BinaryNCDBase):
    """
    https://en.wikipedia.org/wiki/LZMA
    """
    def _compress(self, data):
        if not lzma:
            raise ImportError('Please, install the PylibLZMA module')
        return lzma.compress(data)[14:]


class ZLIBNCD(_BinaryNCDBase):
    """
    https://en.wikipedia.org/wiki/Zlib
    """
    def _compress(self, data):
        return codecs.encode(data, 'zlib_codec')[2:]