"from torch._C import *" ImportError: DLL load failed: 指定されたモジュールが見つかりません。

---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
<ipython-input-5-b4501b23c5cb> in <module>()
----> 1 from fastai.transforms import *
      2 from fastai.conv_learner import *
      3 from fastai.model import *
      4 from fastai.dataset import *
      5 from fastai.sgdr import *

C:\Anaconda3_64\envs\fastai-cpu\lib\site-packages\fastai\transforms.py in <module>()
      1 from .imports import *
----> 2 from .layer_optimizer import *
      3 from enum import IntEnum
      4 
      5 def scale_min(im, targ):

C:\Anaconda3_64\envs\fastai-cpu\lib\site-packages\fastai\layer_optimizer.py in <module>()
      1 from .imports import *
----> 2 from .torch_imports import *
      3 from .core import *
      4 
      5 def opt_params(parm, lr, wd):

C:\Anaconda3_64\envs\fastai-cpu\lib\site-packages\fastai\torch_imports.py in <module>()
      1 import os
----> 2 import torch, torchvision, torchtext
      3 from torch import nn, cuda, backends, FloatTensor, LongTensor, optim
      4 import torch.nn.functional as F
      5 from torch.autograd import Variable

C:\Anaconda3_64\envs\fastai-cpu\lib\site-packages\torch\__init__.py in <module>()
     74     pass
     75 
---> 76 from torch._C import *
     77 
     78 __all__ += [name for name in dir(_C)

ImportError: DLL load failed: 指定されたモジュールが見つかりません。