ظهور الخطأ 'AttributeError: 'module' object has no attribute 'computation أثناء محاولة استخدام المعمارية Sequential في Keras

أثناء محاولة استخدام Sequential في Keras يظهر لي الخطأ التالي:

from keras.datasets import imdb
from keras.preprocessing import sequence
from keras import layers
from keras.models import Sequential
max_features = 10000
maxlen = 500
(x_train, y_train), (x_test, y_test) = imdb.load_data(
num_words=max_features)
x_train = [x[::-1] for x in x_train]
x_test = [x[::-1] for x in x_test]
x_train = sequence.pad_sequences(x_train, maxlen=maxlen)
x_test = sequence.pad_sequences(x_test, maxlen=maxlen)
model = Sequential()
model.add(layers.Embedding(max_features, 100))
model.add(layers.Bidirectional(layers.LSTM(64)))
model.add(layers.Dense(1, activation='sigmoid'))
model.compile(optimizer='rmsprop', loss='binary_crossentropy', metrics=['acc'])
history = model.fit(x_train, y_train,
epochs=8,
batch_size=64,
validation_split=0.2)
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  File "/anaconda/lib/python2.7/site-packages/keras/__init__.py", line 4, in <module>
    from . import applications
  File "/anaconda/lib/python2.7/site-packages/keras/applications/__init__.py", line 1, in <module>
    from .vgg16 import VGG16
  File "/anaconda/lib/python2.7/site-packages/keras/applications/vgg16.py", line 14, in <module>
    from ..models import Model
  File "/anaconda/lib/python2.7/site-packages/keras/models.py", line 14, in <module>
    from . import layers as layer_module
  File "/anaconda/lib/python2.7/site-packages/keras/layers/__init__.py", line 4, in <module>
    from ..engine import Layer
  File "/anaconda/lib/python2.7/site-packages/keras/engine/__init__.py", line 8, in <module>
    from .training import Model
  File "/anaconda/lib/python2.7/site-packages/keras/engine/training.py", line 24, in <module>
    from .. import callbacks as cbks
  File "/anaconda/lib/python2.7/site-packages/keras/callbacks.py", line 25, in <module>
    from tensorflow.contrib.tensorboard.plugins import projector
  File "/anaconda/lib/python2.7/site-packages/tensorflow/contrib/__init__.py", line 30, in <module>
    from tensorflow.contrib import factorization
  File "/anaconda/lib/python2.7/site-packages/tensorflow/contrib/factorization/__init__.py", line 24, in <module>
    from tensorflow.contrib.factorization.python.ops.gmm import *
  File "/anaconda/lib/python2.7/site-packages/tensorflow/contrib/factorization/python/ops/gmm.py", line 27, in <module>
    from tensorflow.contrib.learn.python.learn.estimators import estimator
  File "/anaconda/lib/python2.7/site-packages/tensorflow/contrib/learn/__init__.py", line 87, in <module>
    from tensorflow.contrib.learn.python.learn import *
  File "/anaconda/lib/python2.7/site-packages/tensorflow/contrib/learn/python/__init__.py", line 23, in <module>
    from tensorflow.contrib.learn.python.learn import *
    File "/anaconda/lib/python2.7/site-packages/tensorflow/contrib/learn/python/learn/__init__.py", line 25, in <module>
    from tensorflow.contrib.learn.python.learn import estimators
  File "/anaconda/lib/python2.7/site-packages/tensorflow/contrib/learn/python/learn/estimators/__init__.py", line 297, in <module>
    from tensorflow.contrib.learn.python.learn.estimators.dnn import DNNClassifier
  File "/anaconda/lib/python2.7/site-packages/tensorflow/contrib/learn/python/learn/estimators/dnn.py", line 29, in <module>
    from tensorflow.contrib.learn.python.learn.estimators import dnn_linear_combined
  File "/anaconda/lib/python2.7/site-packages/tensorflow/contrib/learn/python/learn/estimators/dnn_linear_combined.py", line 31, in <module>
    from tensorflow.contrib.learn.python.learn.estimators import estimator
  File "/anaconda/lib/python2.7/site-packages/tensorflow/contrib/learn/python/learn/estimators/estimator.py", line 49, in <module>
    from tensorflow.contrib.learn.python.learn.learn_io import data_feeder
  File "/anaconda/lib/python2.7/site-packages/tensorflow/contrib/learn/python/learn/learn_io/__init__.py", line 21, in <module>
    from tensorflow.contrib.learn.python.learn.learn_io.dask_io import extract_dask_data
  File "/anaconda/lib/python2.7/site-packages/tensorflow/contrib/learn/python/learn/learn_io/dask_io.py", line 26, in <module>
    import dask.dataframe as dd
  File "/anaconda/lib/python2.7/site-packages/dask/dataframe/__init__.py", line 3, in <module>
    from .core import (DataFrame, Series, Index, _Frame, map_partitions,
  File "/anaconda/lib/python2.7/site-packages/dask/dataframe/core.py", line 38, in <module>
    pd.computation.expressions.set_use_numexpr(False)
AttributeError: 'module' object has no attribute 'computation'