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| """ |
| Replabel transforms for use with flashlight's ASG criterion. |
| """ |
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|
| def replabel_symbol(i): |
| """ |
| Replabel symbols used in flashlight, currently just "1", "2", ... |
| This prevents training with numeral tokens, so this might change in the future |
| """ |
| return str(i) |
|
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|
| def pack_replabels(tokens, dictionary, max_reps): |
| """ |
| Pack a token sequence so that repeated symbols are replaced by replabels |
| """ |
| if len(tokens) == 0 or max_reps <= 0: |
| return tokens |
|
|
| replabel_value_to_idx = [0] * (max_reps + 1) |
| for i in range(1, max_reps + 1): |
| replabel_value_to_idx[i] = dictionary.index(replabel_symbol(i)) |
|
|
| result = [] |
| prev_token = -1 |
| num_reps = 0 |
| for token in tokens: |
| if token == prev_token and num_reps < max_reps: |
| num_reps += 1 |
| else: |
| if num_reps > 0: |
| result.append(replabel_value_to_idx[num_reps]) |
| num_reps = 0 |
| result.append(token) |
| prev_token = token |
| if num_reps > 0: |
| result.append(replabel_value_to_idx[num_reps]) |
| return result |
|
|
|
|
| def unpack_replabels(tokens, dictionary, max_reps): |
| """ |
| Unpack a token sequence so that replabels are replaced by repeated symbols |
| """ |
| if len(tokens) == 0 or max_reps <= 0: |
| return tokens |
|
|
| replabel_idx_to_value = {} |
| for i in range(1, max_reps + 1): |
| replabel_idx_to_value[dictionary.index(replabel_symbol(i))] = i |
|
|
| result = [] |
| prev_token = -1 |
| for token in tokens: |
| try: |
| for _ in range(replabel_idx_to_value[token]): |
| result.append(prev_token) |
| prev_token = -1 |
| except KeyError: |
| result.append(token) |
| prev_token = token |
| return result |
|
|
