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几天来，我一直在尝试在不同的机器上安装和运行 pytext，并一直（最终）遇到相同的错误：

Python 3.8.0 (default, Feb 25 2021, 22:10:10) 
[GCC 8.4.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import torch
>>> import pytext
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/joshnoble/pytext/pytext/__init__.py", line 12, in <module>
    from pytext.data.sources.data_source import DataSource
  File "/home/joshnoble/pytext/pytext/data/__init__.py", line 12, in <module>
    from .data import Batcher, Data, PoolingBatcher, generator_iterator
  File "/home/joshnoble/pytext/pytext/data/data.py", line 20, in <module>
    from .tensorizers import MetricTensorizer, Tensorizer, initialize_tensorizers
  File "/home/joshnoble/pytext/pytext/data/tensorizers.py", line 24, in <module>
    from pytext.data.tokenizers import Token, Tokenizer
  File "/home/joshnoble/pytext/pytext/data/tokenizers/__init__.py", line 4, in <module>
    from .tokenizer import (
  File "/home/joshnoble/pytext/pytext/data/tokenizers/tokenizer.py", line 15, in <module>
    from pytext.torchscript.tokenizer import ScriptDoNothingTokenizer, ScriptWordTokenizer
  File "/home/joshnoble/pytext/pytext/torchscript/tokenizer/__init__.py", line 4, in <module>
    from .bpe import ScriptBPE
  File "/home/joshnoble/pytext/pytext/torchscript/tokenizer/bpe.py", line 8, in <module>
    from pytext.torchscript.utils import utf8_chars
  File "/home/joshnoble/pytext/pytext/torchscript/utils.py", line 10, in <module>
    torch.ops.load_library("//caffe2/torch/fb/nlp/operators:padded_sequences")
  File "/home/joshnoble/.local/lib/python3.8/site-packages/torch/_ops.py", line 104, in load_library
    ctypes.CDLL(path)
  File "/usr/lib/python3.8/ctypes/__init__.py", line 369, in __init__
    self._handle = _dlopen(self._name, mode)
OSError: /caffe2/torch/fb/nlp/operators:padded_sequences: cannot open shared object file: No such file or directory

我以为我已经在 virtualenv 中成功构建了 pytext 并使用此处的说明安装了它，也只需运行setup.py install发行版附带的，但最终我都在同一个地方。我不确定我可能需要哪些其他软件包？我确实安装了火炬，我可以检查它是否工作，有 CUDA，并且似乎或多或少地工作，但 pytext 本身似乎难以捉摸。非常感谢任何提示或建议。

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