Keras ImageGenerator：IndexError：列表索引超出范围

Question

我将 kaggle 内核中的数据加载到我的机器上进行复制，现在代码无法正常工作，但可以在同一 python 环境中的 keras 上运行。

这是代码和错误。

def flow_from_dataframe(img_data_gen, in_df, path_col, y_col, **dflow_args):
    base_dir = os.path.dirname(in_df[[path_col]].values[0])
    print('## Ignore next message from keras, values are replaced anyways')
    df_gen = img_data_gen.flow_from_directory(base_dir, 
                                     class_mode = 'sparse',
                                    **dflow_args)
    df_gen.filenames = in_df[path_col].values
    df_gen.classes = np.stack(in_df[y_col].values)
    df_gen.samples = in_df.shape[0]
    df_gen.n = in_df.shape[0]
    df_gen._set_index_array()
    df_gen.directory = '' # since we have the full path
    print('Reinserting dataframe: {} images'.format(in_df.shape[0]))
    return df_gen


train_gen = flow_from_dataframe(core_idg, train_df, 
                             path_col = 'path',
                            y_col = 'disease_vec', 
                            target_size = IMG_SIZE,
                             color_mode = 'rgb',
                            batch_size = 32)

valid_gen = flow_from_dataframe(core_idg, valid_df, 
                             path_col = 'path',
                            y_col = 'disease_vec', 
                            target_size = IMG_SIZE,
                             color_mode = 'rgb',
                            batch_size = 256) # we can use much larger batches for evaluation
# used a fixed dataset for evaluating the algorithm
test_X, test_Y = next(flow_from_dataframe(core_idg, 
                               valid_df, 
                             path_col = 'path',
                            y_col = 'disease_vec', 
                            target_size = IMG_SIZE,
                             color_mode = 'rgb',
                            batch_size = 1024)) # one big batch

t_x, t_y = next(train_gen)
fig, m_axs = plt.subplots(4, 4, figsize = (16, 16))

我可以看到路径和路径列表，但不确定它来自哪里。

Found 0 images belonging to 0 classes.
Reinserting dataframe: 10000 images
Traceback (most recent call last):
  File "main.py", line 181, in <module>
    batch_size = 32)) # one big batch
  File "/home/user/.conda/envs/test_env/lib/python3.6/site-packages/keras_prepro         cessing/image/iterator.py", line 104, in __next__
    return self.next(*args, **kwargs)
  File "/home/user/.conda/envs/test_env/lib/python3.6/site-packages/keras_prepro         cessing/image/iterator.py", line 116, in next
    return self._get_batches_of_transformed_samples(index_array)
  File "/home/user/.conda/envs/test_env/lib/python3.6/site-packages/keras_prepro         cessing/image/iterator.py", line 227, in _get_batches_of_transformed_samples
    img = load_img(filepaths[j],

Answer 1

发生错误是因为filepaths 是空列表。添加到filepaths图片路径：

df_gen.filepaths.extend(df_gen.filenames)