类型错误：__array__() 需要 1 个位置参数，但给出了 2 个？

编程问答 2022-04-21

问题描述

我正在研究图像分类任务的迁移学习。 训练生成器如下：

train_generator = train_datagen.flow_from_directory(
        '/home/idu/Desktop/COV19D/train/',color_mode = "grayscale",target_size=(512,512),# All images are 512 * 512
        batch_size=batch_size,classes = ['covid','non-covid'],class_mode='binary')

转出的模型代码如下：

SIZE = 512
VGG_model = VGG16(include_top=False,weights=None,input_shape=(SIZE,SIZE,1))
for layer in VGG_model.layers:
    layer.trainable = False

feature_extractor=VGG_model.predict(train_generator)

最后一条命令抛出错误：

Traceback (most recent call last):

  File "<ipython-input-28-b9bad68819ec>",line 1,in <module>
    feature_extractor=VGG_model.predict(train_generator)

  File "/home/idu/.local/lib/python3.6/site-packages/keras/engine/training.py",line 1681,in predict
    steps_per_execution=self._steps_per_execution)

  File "/home/idu/.local/lib/python3.6/site-packages/keras/engine/data_adapter.py",line 1348,in get_data_handler
    return DataHandler(*args,**kwargs)

  File "/home/idu/.local/lib/python3.6/site-packages/keras/engine/data_adapter.py",line 1150,in __init__
    model=model)

  File "/home/idu/.local/lib/python3.6/site-packages/keras/engine/data_adapter.py",line 793,in __init__
    peek,x = self._peek_and_restore(x)

  File "/home/idu/.local/lib/python3.6/site-packages/keras/engine/data_adapter.py",line 850,in _peek_and_restore
    peek = next(x)

  File "/home/idu/.local/lib/python3.6/site-packages/keras_preprocessing/image/iterator.py",line 104,in __next__
    return self.next(*args,**kwargs)

  File "/home/idu/.local/lib/python3.6/site-packages/keras_preprocessing/image/iterator.py",line 116,in next
    return self._get_batches_of_transformed_samples(index_array)

  File "/home/idu/.local/lib/python3.6/site-packages/keras_preprocessing/image/iterator.py",line 231,in _get_batches_of_transformed_samples
    x = img_to_array(img,data_format=self.data_format)

  File "/home/idu/.local/lib/python3.6/site-packages/keras_preprocessing/image/utils.py",line 309,in img_to_array
    x = np.asarray(img,dtype=dtype)

  File "/home/idu/.local/lib/python3.6/site-packages/numpy/core/_asarray.py",line 83,in asarray
    return array(a,dtype,copy=False,order=order)

TypeError: __array__() takes 1 positional argument but 2 were given

我怎样才能克服这个错误来进行特征提取？ 谢谢。

解决方法

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