def clean_semver(cls, version_spec):
        return re.sub(r"([<>=~])\s+?v?", "\\1", version_spec, re.IGNORECASE)
def finalize_options(self):
    ret = InstallCommandBase.finalize_options(self)
    self.install_headers = os.path.join(self.install_purelib,
                                        'tensorflow', 'include')
    return ret