Opens one of the topic set resource files and returns a set of topics.

    - Input:  - file_path: The path pointing to the topic set resource file.

    - Output: - topic_set: A python set of strings.

def get_topic_set(file_path):
    """
    Opens one of the topic set resource files and returns a set of topics.

    - Input:  - file_path: The path pointing to the topic set resource file.

    - Output: - topic_set: A python set of strings.
    """
    topic_set = set()
    file_row_gen = get_file_row_generator(file_path, ",")  # The separator here is irrelevant.
    for file_row in file_row_gen:
        topic_set.add(file_row[0])

    return topic_set