translate.py

import onmt
import torch
import argparse
import math

parser = argparse.ArgumentParser(description='translate.py')

parser.add_argument('-model', required=True,
                    help='Path to model .pt file')
parser.add_argument('-src',   required=True,
                    help='Source sequence to decode (one line per sequence)')
parser.add_argument('-tgt',
                    help='True target sequence (optional)')
parser.add_argument('-output', default='pred.txt',
                    help="""Path to output the predictions (each line will
                    be the decoded sequence""")
parser.add_argument('-beam_size',  type=int, default=5,
                    help='Beam size')
parser.add_argument('-batch_size', type=int, default=30,
                    help='Batch size')
parser.add_argument('-max_sent_length', default=100,
                    help='Maximum sentence length.')
parser.add_argument('-replace_unk', action="store_true",
                    help="""Replace the generated UNK tokens with the source
                    token that had the highest attention weight. If phrase_table
                    is provided, it will lookup the identified source token and
                    give the corresponding target token. If it is not provided
                    (or the identified source token does not exist in the
                    table) then it will copy the source token""")
# parser.add_argument('-phrase_table',
#                     help="""Path to source-target dictionary to replace UNK
#                     tokens. See README.md for the format of this file.""")
parser.add_argument('-verbose', action="store_true",
                    help='Print scores and predictions for each sentence')
parser.add_argument('-n_best', type=int, default=1,
                    help="""If verbose is set, will output the n_best
                    decoded sentences""")

parser.add_argument('-gpu', type=int, default=-1,
                    help="Device to run on")



def reportScore(name, scoreTotal, wordsTotal):
    print("%s AVG SCORE: %.4f, %s PPL: %.4f" % (
        name, scoreTotal / wordsTotal,
        name, math.exp(-scoreTotal/wordsTotal)))


def main():
    opt = parser.parse_args()
    opt.cuda = opt.gpu > -1
    if opt.cuda:
        torch.cuda.set_device(opt.gpu)

    translator = onmt.Translator(opt)

    outF = open(opt.output, 'w')

    predScoreTotal, predWordsTotal, goldScoreTotal, goldWordsTotal = 0, 0, 0, 0

    srcBatch, tgtBatch = [], []

    count = 0

    tgtF = open(opt.tgt) if opt.tgt else None
    for line in open(opt.src):

        srcTokens = line.split()
        srcBatch += [srcTokens]
        if tgtF:
            tgtTokens = tgtF.readline().split() if tgtF else None
            tgtBatch += [tgtTokens]

        if len(srcBatch) < opt.batch_size:
            continue

        predBatch, predScore, goldScore = translator.translate(srcBatch, tgtBatch)

        predScoreTotal += sum(score[0] for score in predScore)
        predWordsTotal += sum(len(x[0]) for x in predBatch)
        if tgtF is not None:
            goldScoreTotal += sum(goldScore)
            goldWordsTotal += sum(len(x) for x in tgtBatch)

        for b in range(len(predBatch)):
            count += 1
            outF.write(" ".join(predBatch[b][0]) + '\n')

            if opt.verbose:
                srcSent = ' '.join(srcBatch[b])
                if translator.tgt_dict.lower:
                    srcSent = srcSent.lower()
                print('SENT %d: %s' % (count, srcSent))
                print('PRED %d: %s' % (count, " ".join(predBatch[b][0])))
                print("PRED SCORE: %.4f" % predScore[b][0])

                if tgtF is not None:
                    tgtSent = ' '.join(tgtBatch[b])
                    if translator.tgt_dict.lower:
                        tgtSent = tgtSent.lower()
                    print('GOLD %d: %s ' % (count, tgtSent))
                    print("GOLD SCORE: %.4f" % goldScore[b])

                if opt.n_best > 1:
                    print('\nBEST HYP:')
                    for n in range(opt.n_best):
                        print("[%.4f] %s" % (predScore[b][n], " ".join(predBatch[b][n])))

                print('')

        srcBatch, tgtBatch = [], []

    reportScore('PRED', predScoreTotal, predWordsTotal)
    if tgtF:
        reportScore('GOLD', goldScoreTotal, goldWordsTotal)

    if tgtF:
        tgtF.close()


if __name__ == "__main__":
    main()