エラーは以下のようになっています。

RuntimeError                              Traceback (most recent call last)
<ipython-input-163-bc99f0644372> in <module>()
      2 import matplotlib.pyplot as plt
      3 
----> 4 people=fetch_lfw_people(min_faces_per_person=20,resize=0.7)
      5 image_shape=people.images[0].shape
      6 

~\Anaconda32\lib\site-packages\sklearn\datasets\lfw.py in fetch_lfw_people(data_home, funneled, resize, min_faces_per_person, color, slice_, download_if_missing)
    332     faces, target, target_names = load_func(
    333         data_folder_path, resize=resize,
--> 334         min_faces_per_person=min_faces_per_person, color=color, slice_=slice_)
    335 
    336     # pack the results as a Bunch instance

~\Anaconda32\lib\site-packages\sklearn\externals\joblib\memory.py in __call__(self, *args, **kwargs)
    560 
    561     def __call__(self, *args, **kwargs):
--> 562         return self._cached_call(args, kwargs)[0]
    563 
    564     def __reduce__(self):

~\Anaconda32\lib\site-packages\sklearn\externals\joblib\memory.py in _cached_call(self, args, kwargs)
    508                           'directory %s'
    509                         % (name, argument_hash, output_dir))
--> 510             out, metadata = self.call(*args, **kwargs)
    511             if self.mmap_mode is not None:
    512                 # Memmap the output at the first call to be consistent with

~\Anaconda32\lib\site-packages\sklearn\externals\joblib\memory.py in call(self, *args, **kwargs)
    742         if self._verbose > 0:
    743             print(format_call(self.func, args, kwargs))
--> 744         output = self.func(*args, **kwargs)
    745         self._persist_output(output, output_dir)
    746         duration = time.time() - start_time

~\Anaconda32\lib\site-packages\sklearn\datasets\lfw.py in _fetch_lfw_people(data_folder_path, slice_, color, resize, min_faces_per_person)
    233     target = np.searchsorted(target_names, person_names)
    234 
--> 235     faces = _load_imgs(file_paths, slice_, color, resize)
    236 
    237     # shuffle the faces with a deterministic RNG scheme to avoid having

~\Anaconda32\lib\site-packages\sklearn\datasets\lfw.py in _load_imgs(file_paths, slice_, color, resize)
    186             raise RuntimeError("Failed to read the image file %s, "
    187                                "Please make sure that libjpeg is installed"
--> 188                                % file_path)
    189 
    190         face = np.asarray(img[slice_], dtype=np.float32)

RuntimeError: Failed to read the image file C:\Users\scikit_learn_data\lfw_home\lfw_funneled\Gloria_Macapagal_Arroyo\Gloria_Macapagal_Arroyo_0024.jpg, Please make sure that libjpeg is installed