我正在 google colab 上运行 tensorflow 模型。今天，我收到了这个错误：

 Using TensorFlow backend.
    Traceback (most recent call last):
      File "train.py", line 6, in <module>
        from yolo import create_yolov3_model, dummy_loss
      File "/content/drive/MyDrive/yolo/yolo_plz_work/yolo.py", line 1, in <module>
        from keras.layers import Conv2D, Input, BatchNormalization, LeakyReLU, ZeroPadding2D, UpSampling2D, Lambda
      File "/usr/local/lib/python3.7/dist-packages/keras/__init__.py", line 3, in <module>
        from . import utils
      File "/usr/local/lib/python3.7/dist-packages/keras/utils/__init__.py", line 26, in <module>
        from .vis_utils import model_to_dot
      File "/usr/local/lib/python3.7/dist-packages/keras/utils/vis_utils.py", line 7, in <module>
        from ..models import Model
      File "/usr/local/lib/python3.7/dist-packages/keras/models.py", line 10, in <module>
        from .engine.input_layer import Input
      File "/usr/local/lib/python3.7/dist-packages/keras/engine/__init__.py", line 3, in <module>
        from .input_layer import Input
      File "/usr/local/lib/python3.7/dist-packages/keras/engine/input_layer.py", line 7, in <module>
        from .base_layer import Layer
      File "/usr/local/lib/python3.7/dist-packages/keras/engine/base_layer.py", line 12, in <module>
        from .. import initializers
      File "/usr/local/lib/python3.7/dist-packages/keras/initializers/__init__.py", line 124, in <module>
        populate_deserializable_objects()
      File "/usr/local/lib/python3.7/dist-packages/keras/initializers/__init__.py", line 49, in populate_deserializable_objects
        LOCAL.GENERATED_WITH_V2 = tf.__internal__.tf2.enabled()
      File "/usr/local/lib/python3.7/dist-packages/tensorflow_core/python/util/module_wrapper.py", line 193, in __getattr__
        attr = getattr(self._tfmw_wrapped_module, name)
    AttributeError: module 'tensorflow._api.v1.compat.v2' has no attribute '__internal__'

以前，事情一直很顺利，所以我不确定为什么会发生这种情况。我使用的是 Python 3.7.10，这些是我应该使用的包：

absl-py==0.9.0
astor==0.8.1
gast==0.2.2
google-pasta==0.1.8
grpcio==1.26.0
h5py==2.10.0
Keras==2.3.1
Keras-Applications==1.0.8
Keras-Preprocessing==1.1.0
Markdown==3.1.1
numpy==1.18.1
opencv-contrib-python==4.1.2.30
opt-einsum==3.1.0
protobuf==3.11.2
PyYAML==5.3
scipy==1.4.1
six==1.14.0
tensorboard==1.15.0
tensorflow==1.15.0
tensorflow-estimator==1.15.1
termcolor==1.1.0
tqdm==4.41.1
Werkzeug==0.16.0
wrapt==1.11.2

也许 colab 最近升级了一些库？我确信我遵循了与往常相同的安装步骤。

编辑：我认为 keras 版本中可能存在问题。这是我正在运行的文件的前几行：

from keras.layers import Conv2D, Input, BatchNormalization, LeakyReLU, ZeroPadding2D, UpSampling2D, Lambda
from keras.layers.merge import add, concatenate
from keras.models import Model
from keras.engine.topology import Layer
import tensorflow as tf

如果我删除所有以“from keras”开头的行，我就不会收到错误消息。但是，我以前从未接触过这些行，所以我不知道为什么它们现在会突然导致错误。另外，不是python版本导致这个错误，因为colab在4月份把它改成了3.7.10，我没问题。

回答

!pip3 uninstall keras-nightly
!pip3 uninstall -y tensorflow
!pip3 install keras==2.1.6
!pip3 install tensorflow==1.15.0
!pip3 install h5py==2.10.0