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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def validate(spec, data):
 """Validates the data and creates the config objects"""

    data = copy.deepcopy(data)
    validated_data = {}

    def validate_keys(section, config, section_data):
        if not isinstance(section_data, dict) or section == spec.MODEL:
            return

        extra_args = [key for key in section_data.keys() if key not in config.SCHEMA().fields]
        if extra_args:
            raise PolyaxonfileError('Extra arguments passed for `{}`: {}'.format(
                section, extra_args))

    def add_validated_section(section, config):
        if data.get(section):
            section_data = data[section]
            validate_keys(section=section, config=config, section_data=section_data)
            validated_data[section] = config.from_dict(section_data)

    add_validated_section(spec.ENVIRONMENT, spec.ENVIRONMENT_CONFIG)
    add_validated_section(spec.BUILD, BuildConfig)
    add_validated_section(spec.RUN, RunConfig)
    add_validated_section(spec.MODEL, ModelConfig)
    add_validated_section(spec.TRAIN, TrainConfig)
    add_validated_section(spec.EVAL, EvalConfig)

    return validated_data