AttributeError: 'AsyncioSelectorReactor' object has no attribute '_handleSignals'

该错误是由于对象缺少特定属性而导致的。根据你提供的信息，有两种可能的原因导致出现这个错误。一种可能性是你使用的keras版本过低，可以尝试更新keras版本来解决这个问题。你可以使用以下命令来更新keras:
pip install --upgrade keras
另一种可能性是在ImageDataGenerator对象中缺少flow_from_dataframe属性。根据你提供的引用，你可能需要使用新的ImageDataGenerator类，即keras_preprocessing.image模块中的ImageDataGenerator类。你可以尝试使用以下代码来替换你的代码：
from keras_preprocessing.image import ImageDataGenerator
validation_generator = valid_datagen.flow_from_dataframe(val_data, directory='./tiny-imagenet-200/val/images/', x_col='Files',y_col='Class',target_size=(64,64), color_mode='rgb',class_mode='categorical',batch_size=256, shuffle=True,seed=42)
这样应该能解决你遇到的问题。希望对你有帮助！<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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