def char_to_char(source: str, target: str) -> np.ndarray:
"""Find the character adjacency matrix mapping source string chars to target string chars.
Uses StringMatcher from Levenshtein package to find non-overlapping matching subsequences in
input strings. Uses the result to create a character adjacency matrix from source to target.
(https://docs.python.org/2/library/difflib.html#difflib.SequenceMatcher.get_matching_blocks)
Args:
source (str): string of source chars.
target (str): string of target chars.
Returns:
np.ndarray adjacency matrix mapping chars in the source str to chars in the target str.
"""
sm = StringMatcher(seq1=source, seq2=target)
mb = sm.get_matching_blocks()
return _mat_from_blocks(mb, len(source), len(target))
def char_to_char(self, source: str, target: str) -> Matrix:
# Run Levenshtein at character level.
sm = StringMatcher(seq1=source, seq2=target)
mb = sm.get_matching_blocks()
return self._mat_from_blocks(mb, len(source), len(target))
