我创建了conda环境，并按如下所示安装pytorch和fastai（Mac OS Mojave）：
conda create -n fai_course python=3.7
source activate fai_course
conda install -c pytorch pytorch-nightly-cpu
conda install -c fastai torchvision-nightly-cpu
jupyter notebook
当我从jupyter笔记本中导入软件包时，出现OSError，如下所示：
from fastai.imports import *
-
--------------------------------------------------------------------------
FileNotFoundError Traceback (most recent call last)
/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/matplotlib/font_manager.py in <module>
1352 try:
-> 1353 fontManager = json_load(_fmcache)
1354 if (not hasattr(fontManager, '_version') or
/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/matplotlib/font_manager.py in json_load(filename)
887 """
--> 888 with open(filename, 'r') as fh:
889 return json.load(fh, object_hook=_json_decode)
FileNotFoundError: [Errno 2] No such file or directory: '/Users/user/.matplotlib/fontlist-v300.json'
During handling of the above exception, another exception occurred:
OSError Traceback (most recent call last)
<ipython-input-5-9f9378ae0f2a> in <module>
----> 1 from fastai.imports import *
/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/fastai/__init__.py in <module>
----> 1 from .basic_train import *
2 from .callback import *
3 from .callbacks import *
4 from .core import *
5 from .data import *
/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/fastai/basic_train.py in <module>
1 "Provides basic training and validation with `Learner`"
----> 2 from .torch_core import *
3 from .data import *
4 from .callback import *
5
/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/fastai/torch_core.py in <module>
1 "Utility functions to help deal with tensors"
----> 2 from .imports.torch import *
3 from .core import *
4
5 AffineMatrix = Tensor
/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/fastai/imports/__init__.py in <module>
----> 1 from .core import *
2 from .torch import *
/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/fastai/imports/core.py in <module>
1 import csv, gc, gzip, os, pickle, shutil, sys, warnings
----> 2 import math, matplotlib.pyplot as plt, numpy as np, pandas as pd, random
3 import scipy.stats, scipy.special
4 import abc, collections, hashlib, itertools, json, operator
5 import mimetypes, inspect, typing, functools
/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/matplotlib/pyplot.py in <module>
30 from cycler import cycler
31 import matplotlib
---> 32 import matplotlib.colorbar
33 import matplotlib.image
34 from matplotlib import rcsetup, style
/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/matplotlib/colorbar.py in <module>
30 import matplotlib.collections as collections
31 import matplotlib.colors as colors
---> 32 import matplotlib.contour as contour
33 import matplotlib.cm as cm
34 import matplotlib.gridspec as gridspec
/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/matplotlib/contour.py in <module>
16 import matplotlib.colors as mcolors
17 import matplotlib.collections as mcoll
---> 18 import matplotlib.font_manager as font_manager
19 import matplotlib.text as text
20 import matplotlib.cbook as cbook
/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/matplotlib/font_manager.py in <module>
1361 raise
1362 except Exception:
-> 1363 _rebuild()
1364 else:
1365 _rebuild()
/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/matplotlib/font_manager.py in _rebuild()
1342 global fontManager
1343
-> 1344 fontManager = FontManager()
1345
1346 if _fmcache:
/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/matplotlib/font_manager.py in __init__(self, size, weight)
976 self.defaultFont = {}
977
--> 978 ttffiles = findSystemFonts(paths) + findSystemFonts()
979 self.defaultFont['ttf'] = next(
980 (fname for fname in ttffiles
/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/matplotlib/font_manager.py in findSystemFonts(fontpaths, fontext)
268 # check for OS X & load its fonts if present
269 if sys.platform == 'darwin':
--> 270 fontfiles.update(OSXInstalledFonts(fontext=fontext))
271
272 elif isinstance(fontpaths, str):
/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/matplotlib/font_manager.py in OSXInstalledFonts(directories, fontext)
216 directories = OSXFontDirectories
217 return [path
--> 218 for directory in directories
219 for ext in get_fontext_synonyms(fontext)
220 for path in list_fonts(directory, ext)]
/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/matplotlib/font_manager.py in <listcomp>(.0)
218 for directory in directories
219 for ext in get_fontext_synonyms(fontext)
--> 220 for path in list_fonts(directory, ext)]
221
222
/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/matplotlib/font_manager.py in list_fonts(directory, extensions)
155 extensions = ["." + ext for ext in extensions]
156 return [str(path)
--> 157 for path in filter(Path.is_file, Path(directory).glob("**/*.*"))
158 if path.suffix in extensions]
159
/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/matplotlib/font_manager.py in <listcomp>(.0)
154 """
155 extensions = ["." + ext for ext in extensions]
--> 156 return [str(path)
157 for path in filter(Path.is_file, Path(directory).glob("**/*.*"))
158 if path.suffix in extensions]
/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/pathlib.py in glob(self, pattern)
1080 raise NotImplementedError("Non-relative patterns are unsupported")
1081 selector = _make_selector(tuple(pattern_parts))
-> 1082 for p in selector.select_from(self):
1083 yield p
1084
/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/pathlib.py in _select_from(self, parent_path, is_dir, exists, scandir)
541 try:
542 successor_select = self.successor._select_from
--> 543 for starting_point in self._iterate_directories(parent_path, is_dir, scandir):
544 for p in successor_select(starting_point, is_dir, exists, scandir):
545 if p not in yielded:
/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/pathlib.py in _iterate_directories(self, parent_path, is_dir, scandir)
531 if entry.is_dir() and not entry.is_symlink():
532 path = parent_path._make_child_relpath(entry.name)
--> 533 for p in self._iterate_directories(path, is_dir, scandir):
534 yield p
535 except PermissionError:
/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/pathlib.py in _iterate_directories(self, parent_path, is_dir, scandir)
531 if entry.is_dir() and not entry.is_symlink():
532 path = parent_path._make_child_relpath(entry.name)
--> 533 for p in self._iterate_directories(path, is_dir, scandir):
534 yield p
535 except PermissionError:
/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/pathlib.py in _iterate_directories(self, parent_path, is_dir, scandir)
531 if entry.is_dir() and not entry.is_symlink():
532 path = parent_path._make_child_relpath(entry.name)
--> 533 for p in self._iterate_directories(path, is_dir, scandir):
534 yield p
535 except PermissionError:
/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/pathlib.py in _iterate_directories(self, parent_path, is_dir, scandir)
531 if entry.is_dir() and not entry.is_symlink():
532 path = parent_path._make_child_relpath(entry.name)
--> 533 for p in self._iterate_directories(path, is_dir, scandir):
534 yield p
535 except PermissionError:
/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/pathlib.py in _iterate_directories(self, parent_path, is_dir, scandir)
531 if entry.is_dir() and not entry.is_symlink():
532 path = parent_path._make_child_relpath(entry.name)
--> 533 for p in self._iterate_directories(path, is_dir, scandir):
534 yield p
535 except PermissionError:
/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/pathlib.py in _iterate_directories(self, parent_path, is_dir, scandir)
531 if entry.is_dir() and not entry.is_symlink():
532 path = parent_path._make_child_relpath(entry.name)
--> 533 for p in self._iterate_directories(path, is_dir, scandir):
534 yield p
535 except PermissionError:
/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/pathlib.py in _iterate_directories(self, parent_path, is_dir, scandir)
531 if entry.is_dir() and not entry.is_symlink():
532 path = parent_path._make_child_relpath(entry.name)
--> 533 for p in self._iterate_directories(path, is_dir, scandir):
534 yield p
535 except PermissionError:
/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/pathlib.py in _iterate_directories(self, parent_path, is_dir, scandir)
529 entries = list(scandir(parent_path))
530 for entry in entries:
--> 531 if entry.is_dir() and not entry.is_symlink():
532 path = parent_path._make_child_relpath(entry.name)
533 for p in self._iterate_directories(path, is_dir, scandir):
OSError: [Errno 62] Too many levels of symbolic links: '.Trash/NETGEARGenie.app/Contents/Frameworks/QtPrintSupport.framework/Versions/5/5'
可以让我知道我在想什么吗？ 谢谢
答案 0 :(得分：0)
诚然，该错误非常令人困惑。但是，查看库路径：
/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7 /
我猜您不是使用通过conda安装的Jupyter，而是使用另一种本地安装。
尝试检查您正在使用哪个Jupyter：
which jupyter
这应该类似于：
〜/ anaconda3 / bin / jupyter
如果不是，则说明您使用的是另一种jupyter安装，但似乎未安装这些库。
答案 1 :(得分：0)
如果您访问fastai github存储库，则会看到以下内容：“ NB：fastai v1当前仅支持Linux，并且需要PyTorch v1和Python 3.6 ... ”
因此，您至少可以尝试使用Python 3.6创建环境
或者像Python 3.7一样开始做，就像这篇文章一样：https://medium.com/@plape/how-to-install-fastai-on-mac-a05496670926
使用
conda install -c pytorch -c fastai fastai jupyter
代替
conda install -c pytorch pytorch-nightly-cpu
conda install -c fastai torchvision-nightly-cpu
希望这会有所帮助。