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refactor: ⚡ Speeded up CTC decoding in PyTorch by x10 #633

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merged 7 commits into from
Nov 18, 2021
Merged

refactor: ⚡ Speeded up CTC decoding in PyTorch by x10 #633

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9f5d0f8
feat: Added support of basic sequence to decode_sequence
fg-mindee Nov 17, 2021
3d84d26
test: Updated unittests
fg-mindee Nov 17, 2021
4b7b032
feat: Speeded up CTC decoding in PyTorch
fg-mindee Nov 17, 2021
a936512
fix: Fixed decode_sequence
fg-mindee Nov 17, 2021
f00123c
style: Silenced import warning
fg-mindee Nov 17, 2021
bda3773
test: Extended decode_sequence unittest
fg-mindee Nov 17, 2021
bbf5676
test: Extended unittest
fg-mindee Nov 17, 2021
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fix: Fixed decode_sequence
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@fg-mindee
fg-mindee committed Nov 17, 2021
commit a936512414b98e425dac3ed8e1a30bbb4dcf6031
10 changes: 7 additions & 3 deletions doctr/datasets/utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -7,7 +7,9 @@
import unicodedata
from collections import Sequence
from functools import partial
from typing import Any, List, Optional, Sequence, Union
from typing import Any, List, Optional
from typing import Sequence as SequenceType
from typing import Union

import numpy as np

Expand Down Expand Up @@ -67,7 +69,7 @@ def encode_string(


def decode_sequence(
input_seq: Union[np.array, Sequence[int]],
input_seq: Union[np.array, SequenceType[int]],
mapping: str,
) -> str:
"""Given a predefined mapping, decode the sequence of numbers to a string
Expand All @@ -80,7 +82,9 @@ def decode_sequence(
A string, decoded from input_seq
"""

if not isinstance(input_seq, Sequence) or input_seq.dtype != np.int_ or input_seq.max() >= len(mapping):
if not isinstance(input_seq, (Sequence, np.ndarray)):
raise TypeError("Invalid sequence type")
if isinstance(input_seq, np.ndarray) and (input_seq.dtype != np.int_ or input_seq.max() >= len(mapping)):
raise AssertionError("Input must be an array of int, with max less than mapping size")

return ''.join(map(mapping.__getitem__, input_seq))
Expand Down