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| #!/usr/bin/env python | |
| # Copyright (c) Facebook, Inc. and its affiliates. | |
| # | |
| # This source code is licensed under the MIT license found in the | |
| # LICENSE file in the root directory of this source tree. | |
| import argparse | |
| import fileinput | |
| from tqdm import tqdm | |
| def main(): | |
| parser = argparse.ArgumentParser( | |
| description=( | |
| "Extract back-translations from the stdout of fairseq-generate. " | |
| "If there are multiply hypotheses for a source, we only keep the first one. " | |
| ) | |
| ) | |
| parser.add_argument("--output", required=True, help="output prefix") | |
| parser.add_argument( | |
| "--srclang", required=True, help="source language (extracted from H-* lines)" | |
| ) | |
| parser.add_argument( | |
| "--tgtlang", required=True, help="target language (extracted from S-* lines)" | |
| ) | |
| parser.add_argument("--minlen", type=int, help="min length filter") | |
| parser.add_argument("--maxlen", type=int, help="max length filter") | |
| parser.add_argument("--ratio", type=float, help="ratio filter") | |
| parser.add_argument("files", nargs="*", help="input files") | |
| args = parser.parse_args() | |
| def validate(src, tgt): | |
| srclen = len(src.split(" ")) if src != "" else 0 | |
| tgtlen = len(tgt.split(" ")) if tgt != "" else 0 | |
| if ( | |
| (args.minlen is not None and (srclen < args.minlen or tgtlen < args.minlen)) | |
| or ( | |
| args.maxlen is not None | |
| and (srclen > args.maxlen or tgtlen > args.maxlen) | |
| ) | |
| or ( | |
| args.ratio is not None | |
| and (max(srclen, tgtlen) / float(min(srclen, tgtlen)) > args.ratio) | |
| ) | |
| ): | |
| return False | |
| return True | |
| def safe_index(toks, index, default): | |
| try: | |
| return toks[index] | |
| except IndexError: | |
| return default | |
| with open(args.output + "." + args.srclang, "w") as src_h, open( | |
| args.output + "." + args.tgtlang, "w" | |
| ) as tgt_h: | |
| for line in tqdm(fileinput.input(args.files)): | |
| if line.startswith("S-"): | |
| tgt = safe_index(line.rstrip().split("\t"), 1, "") | |
| elif line.startswith("H-"): | |
| if tgt is not None: | |
| src = safe_index(line.rstrip().split("\t"), 2, "") | |
| if validate(src, tgt): | |
| print(src, file=src_h) | |
| print(tgt, file=tgt_h) | |
| tgt = None | |
| if __name__ == "__main__": | |
| main() | |