我在Google Colab中预先训练了对象检测模型（Google Colab + TensorFlow），我每周运行两到三次，用于我的新图像，去年到本周一切都很好。现在，当我尝试运行模型时，我有这样的消息：

Graph execution error:

2 root error(s) found.
  (0) UNIMPLEMENTED:  DNN library is not found.
     [[{{node functional_1/conv1_conv/Conv2D}}]]
     [[StatefulPartitionedCall/SecondStagePostprocessor/BatchMultiClassNonMaxSuppression/MultiClassNonMaxSuppression/Reshape_5/_126]]
  (1) UNIMPLEMENTED:  DNN library is not found.
     [[{{node functional_1/conv1_conv/Conv2D}}]]
0 successful operations.
0 derived errors ignored. [Op:__inference_restored_function_body_27380] ***

以前从没发生过。
在运行模型之前，我必须使用以下命令安装Tensor Flow对象检测API：

import os

os.chdir('/project/models/research')

!protoc object_detection/protos/*.proto --python_out=.
!cp object_detection/packages/tf2/setup.py .
!python -m pip install .

这是命令的输出：

Processing /content/gdrive/MyDrive/models/research
  DEPRECATION: A future pip version will change local packages to be built in-place without first copying to a temporary directory. We recommend you use --use-feature=in-tree-build to test your packages with this new behavior before it becomes the default.
   pip 21.3 will remove support for this functionality. You can find discussion regarding this at https://github.com/pypa/pip/issues/7555.
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Building wheels for collected packages: object-detection, py-cpuinfo, dill, avro-python3, seqeval
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Successfully built object-detection py-cpuinfo dill avro-python3 seqeval
Installing collected packages: requests, protobuf, numpy, tf-estimator-nightly, tensorflow-io-gcs-filesystem, tensorboard, keras, tensorflow, portalocker, dill, colorama, tf-slim, tensorflow-text, tensorflow-model-optimization, tensorflow-addons, seqeval, sentencepiece, sacrebleu, pyyaml, pymongo, py-cpuinfo, proto-plus, orjson, opencv-python-headless, hdfs, fastavro, tf-models-official, tensorflow-io, lvis, avro-python3, apache-beam, object-detection
  Attempting uninstall: requests
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    Uninstalling requests-2.23.0:
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  Attempting uninstall: tensorflow-io-gcs-filesystem
    Found existing installation: tensorflow-io-gcs-filesystem 0.23.1
    Uninstalling tensorflow-io-gcs-filesystem-0.23.1:
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  Attempting uninstall: tensorboard
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  Attempting uninstall: dill
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  Attempting uninstall: pyyaml
    Found existing installation: PyYAML 3.13
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  Attempting uninstall: pymongo
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ERROR: pip's dependency resolver does not currently take into account all the packages that are installed. This behaviour is the source of the following dependency conflicts.
yellowbrick 1.3.post1 requires numpy<1.20,>=1.16.0, but you have numpy 1.20.3 which is incompatible.
multiprocess 0.70.12.2 requires dill>=0.3.4, but you have dill 0.3.1.1 which is incompatible.
google-colab 1.0.0 requires requests~=2.23.0, but you have requests 2.27.1 which is incompatible.
datascience 0.10.6 requires folium==0.2.1, but you have folium 0.8.3 which is incompatible.
albumentations 0.1.12 requires imgaug<0.2.7,>=0.2.5, but you have imgaug 0.2.9 which is incompatible.
Successfully installed apache-beam-2.35.0 avro-python3-1.10.2 colorama-0.4.4 dill-0.3.1.1 fastavro-1.4.9 hdfs-2.6.0 keras-2.8.0 lvis-0.5.3 numpy-1.20.3 object-detection-0.1 opencv-python-headless-4.5.5.62 orjson-3.6.6 portalocker-2.3.2 proto-plus-1.19.9 protobuf-3.19.4 py-cpuinfo-8.0.0 pymongo-3.12.3 pyyaml-5.4.1 requests-2.27.1 sacrebleu-2.0.0 sentencepiece-0.1.96 seqeval-1.2.2 tensorboard-2.8.0 tensorflow-2.8.0 tensorflow-addons-0.15.0 tensorflow-io-0.24.0 tensorflow-io-gcs-filesystem-0.24.0 tensorflow-model-optimization-0.7.0 tensorflow-text-2.8.1 tf-estimator-nightly-2.8.0.dev2021122109 tf-models-official-2.8.0 tf-slim-1.1.0

我注意到这个命令卸载了tensorflow 2.7并安装了tensorflow 2.8。我不确定它以前是否发生过。也许这就是DNN库链接丢失的原因？
我可以证实这些：
1.预训练模型或已经安装的模型或我一年前下载的object_detection源文件中没有任何变化。
1.我试过执行命令！pip install dnn -不工作
1.我试图重新启动运行时（不断开连接）-不工作
有人能帮忙吗谢谢.