{"record":{"id":"3cc8ff389f4085ec","repo":"keras-team/keras","slug":"after-filtering-for-sequences-shorter-than-maxlen","errorCode":null,"errorMessage":"After filtering for sequences shorter than maxlen={maxlen}, no sequence was kept. Increase maxlen.","messagePattern":"After filtering for sequences shorter than maxlen=(.+?), no sequence was kept\\. Increase maxlen\\.","errorType":"validation","errorClass":"ValueError","httpStatus":null,"severity":"error","filePath":"keras/src/datasets/imdb.py","lineNumber":119,"sourceCode":"    rng.shuffle(indices)\n    x_test = x_test[indices]\n    labels_test = labels_test[indices]\n\n    if start_char is not None:\n        x_train = [[start_char] + [w + index_from for w in x] for x in x_train]\n        x_test = [[start_char] + [w + index_from for w in x] for x in x_test]\n    elif index_from:\n        x_train = [[w + index_from for w in x] for x in x_train]\n        x_test = [[w + index_from for w in x] for x in x_test]\n    else:\n        x_train = [[w for w in x] for x in x_train]\n        x_test = [[w for w in x] for x in x_test]\n\n    if maxlen:\n        x_train, labels_train = remove_long_seq(maxlen, x_train, labels_train)\n        x_test, labels_test = remove_long_seq(maxlen, x_test, labels_test)\n        if not x_train or not x_test:\n            raise ValueError(\n                \"After filtering for sequences shorter than maxlen=\"\n                f\"{str(maxlen)}, no sequence was kept. Increase maxlen.\"\n            )\n\n    xs = x_train + x_test\n    labels = np.concatenate([labels_train, labels_test])\n\n    if not num_words:\n        num_words = max(max(x) for x in xs)\n\n    # by convention, use 2 as OOV word\n    # reserve 'index_from' (=3 by default) characters:\n    # 0 (padding), 1 (start), 2 (OOV)\n    if oov_char is not None:\n        xs = [\n            [w if (skip_top <= w < num_words) else oov_char for w in x]\n            for x in xs\n        ]","sourceCodeStart":101,"sourceCodeEnd":137,"githubUrl":"https://github.com/keras-team/keras/blob/7a34a03db60bf60042242d6a556fc3be119046a5/keras/src/datasets/imdb.py#L101-L137","documentation":"Error \"After filtering for sequences shorter than maxlen={maxlen}, no sequence was kept. Increase maxlen.\" thrown in keras-team/keras.","triggerScenarios":"Thrown at keras/src/datasets/imdb.py:119 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":[],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"7a34a03db60bf60042242d6a556fc3be119046a5","analyzedAt":"2026-08-25T21:25:25.994Z","schemaVersion":2},"datasetVersion":"2026-08-26T02:17:13.382Z"}