解决Python3.5在Win10下导入Keras/TensorFlow的DLL加载失败问题

问题现象

在Python 3.5.2环境下尝试导入Keras库时，系统会先加载TensorFlow后端。若TensorFlow未能正确加载，将抛出 ImportError: DLL load failed: The specified module could not be found. 错误。完整的报错堆栈通常包含 _pywrap_tensorflow_internal 模块无法导入的信息，最终提示“Failed to load the native TensorFlow runtime”。

Python 3.5.2 |Continuum Analytics, Inc.| (default, Jul 5 2016, 11:41:13) [MSC v.1900 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import keras
Using TensorFlow backend.
Traceback (most recent call last):
 File "d:\Anaconda3\envs\tf\lib\site-packages\tensorflow\python\pywrap_tensorflow_internal.py", line 18, in swig_import_helper
  return importlib.import_module(mname)
 File "d:\Anaconda3\envs\tf\lib\importlib\__init__.py", line 126, in import_module
  return _bootstrap._gcd_import(name[level:], package, level)
 File "<frozen _bootstrap>", line 986, in _gcd_import
 File "<frozen _bootstrap>", line 969, in _find_and_load
 File "<frozen _bootstrap>", line 958, in _find_and_load_unlocked
 File "<frozen _bootstrap>", line 666, in _load_unlocked
 File "<frozen _bootstrap>", line 577, in module_from_spec
 File "<frozen _bootstrap_external>", line 906, in create_module
 File "<frozen _bootstrap>", line 222, in _call_with_frames_removed
ImportError: DLL load failed: The specified module could not be found.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
 File "d:\Anaconda3\envs\tf\lib\site-packages\tensorflow\python\pywrap_tensorflow.py", line 41, in <module>
  from tensorflow.python.pywrap_tensorflow_internal import *
 File "d:\Anaconda3\envs\tf\lib\site-packages\tensorflow\python\pywrap_tensorflow_internal.py", line 21, in <module>
  _pywrap_tensorflow_internal = swig_import_helper()
 File "d:\Anaconda3\envs\tf\lib\site-packages\tensorflow\python\pywrap_tensorflow_internal.py", line 20, in swig_import_helper
  return importlib.import_module('_pywrap_tensorflow_internal')
 File "d:\Anaconda3\envs\tf\lib\importlib\__init__.py", line 126, in import_module
  return _bootstrap._gcd_import(name[level:], package, level)
ImportError: No module named '_pywrap_tensorflow_internal'


Failed to load the native TensorFlow runtime.

See https://www.tensorflow.org/install/install_sources#common_installation_problems

for some common reasons and solutions. Include the entire stack trace
above this error message when asking for help.

解决方法

该错误通常由缺少必要的Microsoft Visual C++运行库引起。请按照以下步骤操作：

第一步：安装Visual C++ 2015 Redistributable

1. 访问Microsoft官方提供的ID 53587页面，下载并安装 Microsoft Visual C++ 2015 Redistributable Update 3。
2. 安装完成后，务必重启电脑以确保系统环境生效。

第二步：重装TensorFlow

重启后，需卸载现有的TensorFlow相关包并重新安装，以利用新安装的运行库：

# 卸载现有版本
pip uninstall tensorflow
pip uninstall tensorflow-gpu

# 重新安装
pip install tensorflow
pip install tensorflow-gpu

若上述步骤仍无效，可尝试升级setuptools后重试：

pip install --upgrade --ignore-installed setuptools

验证结果

完成上述操作后，再次在Python环境中执行 import keras。若不再抛出DLL加载失败的错误，且正常输出“Using TensorFlow backend”，则说明问题已解决。

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