<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
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<USER_TASK:>
Description:
 def validate_task_schema(context, schema_key='schema_file'):
 """Validate the task definition. Args: context (scriptworker.context.Context):
 the scriptworker context. It must contain a task and the config pointing to the schema file schema_key: the key in `context.config` where the path to the schema file is. Key can contain dots (e.g.: 'schema_files.file_a'), in which case Raises: TaskVerificationError: if the task doesn't match the schema """

    schema_path = context.config
    schema_keys = schema_key.split('.')
    for key in schema_keys:
        schema_path = schema_path[key]

    task_schema = load_json_or_yaml(schema_path, is_path=True)
    log.debug('Task is validated against this schema: {}'.format(task_schema))

    try:
        validate_json_schema(context.task, task_schema)
    except ScriptWorkerTaskException as e:
        raise TaskVerificationError('Cannot validate task against schema. Task: {}.'.format(context.task)) from e