AttributeError:模块“keras.backend”没有属性“_BACKEND”

Question

我正在学习一本关于构建聊天机器人的书，当我试图开始交互式学习时，我会继续遇到这个错误。

完全错误是：

"C:\Users\Max\AppData\Local\Programs\Python\Python37\lib\site-packages\rasa_core\policies\keras_policy.py"，跟踪(最近一次调用)：train_initialize.py文件，第18行，在

= Agent("horoscope_domain.yml"，policies = MemoizationPolicy()，KerasPolicy())文件第31行，在init if KerasPolicy.is_using_tensorflow()而非：File KerasPolicy.is_using_tensorflow第48行中，在is_using_tensorflow中返回keras.backend._BACKEND == "tensorflow“AttributeError:模块'keras.backend‘没有属性'_BACKEND’

我的代码看起来像‘

from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
from __future__ import unicode_literals

from rasa_core import utils
import tensorflow.keras.backend
from rasa_core.agent import Agent
from rasa_core.policies.keras_policy import KerasPolicy
from rasa_core.policies.memoization import MemoizationPolicy
from rasa_core.policies.sklearn_policy import SklearnPolicy

if __name__ == '__main__':
    utils.configure_colored_logging(loglevel="DEBUG")

    training_data_file = './data/stories.md'
    model_path = './models/dialogue'
    agent = Agent("horoscope_domain.yml", policies = [MemoizationPolicy(), KerasPolicy()])

    training_data = agent.load_data(training_data_file)

    agent.train(training_data, augmentation_factor = 50, epochs = 500, batch_size = 10, validation_split = 0.2)
    agent.persist(model_path)

“”“

Answer 1

看起来像过时的API代码；打开错误跟踪中的文件，并替换._BACKEND w/ .backend()

# In "C:\Users\Max\AppData\Local\Programs\Python\Python37\lib\site-packages
# \rasa_core\policies\keras_policy.py", line 48:

# return keras.backend._BACKEND == "tensorflow" # <-- DELETE
return keras.backend.backend() == "tensorflow"  # <-- PASTE