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Dataset Viewer issue: UnicodeDecodeError

#1
by albertvillanova - opened
Discussion
albertvillanova

The dataset viewer is not working.

Error details:

Error code:   FeaturesError
Exception:    UnicodeDecodeError
Message:      'utf-8' codec can't decode byte 0xff in position 0: invalid start byte
Traceback:    Traceback (most recent call last):
                File "/src/services/worker/src/worker/job_runners/split/first_rows_from_streaming.py", line 262, in compute_first_rows_response
                  iterable_dataset = iterable_dataset._resolve_features()
                File "/src/services/worker/.venv/lib/python3.9/site-packages/datasets/iterable_dataset.py", line 1703, in _resolve_features
                  features = _infer_features_from_batch(self._head())
                File "/src/services/worker/.venv/lib/python3.9/site-packages/datasets/iterable_dataset.py", line 824, in _head
                  return _examples_to_batch(list(self.take(n)))
                File "/src/services/worker/.venv/lib/python3.9/site-packages/datasets/iterable_dataset.py", line 937, in __iter__
                  for key, example in ex_iterable:
                File "/src/services/worker/.venv/lib/python3.9/site-packages/datasets/iterable_dataset.py", line 678, in __iter__
                  yield from islice(self.ex_iterable, self.n)
                File "/src/services/worker/.venv/lib/python3.9/site-packages/datasets/iterable_dataset.py", line 113, in __iter__
                  yield from self.generate_examples_fn(**self.kwargs)
                File "/src/services/worker/.venv/lib/python3.9/site-packages/datasets/iterable_dataset.py", line 763, in wrapper
                  for key, table in generate_tables_fn(**kwargs):
                File "/src/services/worker/.venv/lib/python3.9/site-packages/datasets/packaged_modules/csv/csv.py", line 177, in _generate_tables
                  csv_file_reader = pd.read_csv(file, iterator=True, dtype=dtype, **self.config.pd_read_csv_kwargs)
                File "/src/services/worker/.venv/lib/python3.9/site-packages/datasets/streaming.py", line 71, in wrapper
                  return function(*args, use_auth_token=use_auth_token, **kwargs)
                File "/src/services/worker/.venv/lib/python3.9/site-packages/datasets/download/streaming_download_manager.py", line 790, in xpandas_read_csv
                  return pd.read_csv(xopen(filepath_or_buffer, "rb", use_auth_token=use_auth_token), **kwargs)
                File "/src/services/worker/.venv/lib/python3.9/site-packages/pandas/util/_decorators.py", line 211, in wrapper
                  return func(*args, **kwargs)
                File "/src/services/worker/.venv/lib/python3.9/site-packages/pandas/util/_decorators.py", line 331, in wrapper
                  return func(*args, **kwargs)
                File "/src/services/worker/.venv/lib/python3.9/site-packages/pandas/io/parsers/readers.py", line 950, in read_csv
                  return _read(filepath_or_buffer, kwds)
                File "/src/services/worker/.venv/lib/python3.9/site-packages/pandas/io/parsers/readers.py", line 605, in _read
                  parser = TextFileReader(filepath_or_buffer, **kwds)
                File "/src/services/worker/.venv/lib/python3.9/site-packages/pandas/io/parsers/readers.py", line 1442, in __init__
                  self._engine = self._make_engine(f, self.engine)
                File "/src/services/worker/.venv/lib/python3.9/site-packages/pandas/io/parsers/readers.py", line 1753, in _make_engine
                  return mapping[engine](f, **self.options)
                File "/src/services/worker/.venv/lib/python3.9/site-packages/pandas/io/parsers/c_parser_wrapper.py", line 79, in __init__
                  self._reader = parsers.TextReader(src, **kwds)
                File "pandas/_libs/parsers.pyx", line 547, in pandas._libs.parsers.TextReader.__cinit__
                File "pandas/_libs/parsers.pyx", line 636, in pandas._libs.parsers.TextReader._get_header
                File "pandas/_libs/parsers.pyx", line 852, in pandas._libs.parsers.TextReader._tokenize_rows
                File "pandas/_libs/parsers.pyx", line 1965, in pandas._libs.parsers.raise_parser_error
              UnicodeDecodeError: 'utf-8' codec can't decode byte 0xff in position 0: invalid start byte

cc @albertvillanova

albertvillanova changed discussion title from Dataset Viewer issue to Dataset Viewer issue: UnicodeDecodeError
albertvillanova

After investigation, I think there are 2 different issues here:

  • First, the datasets library infers that this is a CSV dataset and tries to read all files as CSV: thus the UnicodeDecodeError when trying to read image file x/tmp27vi9nrg.jpg. I am working to fix this issue.
  • Second, I guess you would like to implement an ImageFolder dataset instead of a CSV dataset:
    • For this you should add more .jpg files: the inference of the dataset type is done from the most common file extensions (by counting them).
    • Also the metadata file should be called metadata.csv instead of data.csv
    • In the metadata, the column corresponding to the image file path should be called file_name

You can find more information about the ImageFolder dataset in our docs: https://huggingface.co/docs/datasets/image_dataset#imagefolder

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