components.py 文件源码

def validate_requirements(component_names, dev_requirements_file="alt_requirements/requirements_dev.txt"):
    # type: (List[Text], Text) -> None
    """Ensures that all required python packages are installed to instantiate and used the passed components."""
    from rasa_nlu import registry

    # Validate that all required packages are installed
    failed_imports = set()
    for component_name in component_names:
        component_class = registry.get_component_class(component_name)
        failed_imports.update(find_unavailable_packages(component_class.required_packages()))
    if failed_imports:  # pragma: no cover
        # if available, use the development file to figure out the correct version numbers for each requirement
        all_requirements = _read_dev_requirements(dev_requirements_file)
        if all_requirements:
            missing_requirements = [r for i in failed_imports for r in all_requirements[i]]
            raise Exception("Not all required packages are installed. " +
                            "Failed to find the following imports {}. ".format(", ".join(failed_imports)) +
                            "To use this pipeline, you need to install the missing dependencies, e.g. by running:\n\t" +
                            "> pip install {}".format(" ".join(missing_requirements)))
        else:
            raise Exception("Not all required packages are installed. " +
                            "To use this pipeline, you need to install the missing dependencies. " +
                            "Please install {}".format(", ".join(failed_imports)))