ValueError: Tried to convert ‘min_object_covered’ to a tensor and failed. Error:

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ValueError: Tried to convert ‘min_object_covered’ to a tensor and failed. Error: None values not supported. 的错误。
是因为tensorflow的API发生变化，代码需要调整。
原来

bbox_begin, bbox_size, _ = tf.image.sample_distorted_bounding_box(tf.shape(image), bounding_boxes=bbox)

调整为：

bbox_begin, bbox_size, _ = tf.image.sample_distorted_bounding_box(tf.shape(image), bounding_boxes=bbox,min_object_covered=0.1)