use Swift for TensorFlow

在安装 swift tensorflow toolchain的是时候会报开发者认证安全问题，安装完成之后，运行下面代码仍然会报签名错误，通过启用“ Signing & Capabilities > Hardened Runtime”中的“ Disable Library Validation”选项来解决问题，此选项使Xcode项目无需任何代码签名即可添加框架。

import TensorFlow

#if canImport(PythonKit)
    import PythonKit
#else
    import Python
#endif
print(Python.version)


dyld: Library not loaded: @rpath/libPythonKit.dylib
  Referenced from: /Users/roo/Library/Developer/Xcode/DerivedData/ML-aiwacdptcsjucpgbfzvxoetkkxcl/Build/Products/Debug/ML
  Reason: no suitable image found.  Did find:
	/Library/Developer/Toolchains/swift-tensorflow-RELEASE-0.10.xctoolchain/usr/lib/swift/macosx/libPythonKit.dylib: code signature in (/Library/Developer/Toolchains/swift-tensorflow-RELEASE-0.10.xctoolchain/usr/lib/swift/macosx/libPythonKit.dylib) not valid for use in process using Library Validation: mapped file has no Team ID and is not a platform binary (signed with custom identity or adhoc?)