input: from typing import List, Dict
  
  def summarize_twitter_data(twitter_data: List[Dict[str, any]]) -> None:
      """
      Visualize the Twitter data by plotting summaries for tweet authors, number of likes, and number of retweets.
      
      >>> summarize_twitter_data([
      ...     {'author': 'Alice', 'date': '2023-10-01', 'text': 'Hello World', 'likes': 10, 'retweets': 5},
      ...     {'author': 'Bob', 'date': '2023-10-01', 'text': 'Hello Earth', 'likes': 15, 'retweets': 7},
      ...     {'author': 'Alice', 'date': '2023-10-02', 'text': 'Hello Universe', 'likes': 20, 'retweets': 10}
      ... ])
      # Displays bar charts for:
      # - Tweet Authors vs. Number of Tweets
      # - Tweets vs. Number of Likes
      # - Tweets vs. Number of Retweets
      """
output:     from collections import defaultdict
      import matplotlib.pyplot as plt
  
      # Initialize dictionaries to store counts
      author_tweet_count = defaultdict(int)
      tweet_likes = defaultdict(int)
      tweet_retweets = defaultdict(int)
  
      # Populate the dictionaries
      for tweet in twitter_data:
          author = tweet['author']
          likes = tweet['likes']
          retweets = tweet['retweets']
          
          author_tweet_count[author] += 1
          tweet_likes[author] += likes
          tweet_retweets[author] += retweets
  
      # Plotting Tweet Authors vs. Number of Tweets
      plt.figure(figsize=(10, 5))
      plt.bar(author_tweet_count.keys(), author_tweet_count.values(), color='blue')
      plt.xlabel('Tweet Authors')
      plt.ylabel('Number of Tweets')
      plt.title('Tweet Authors vs. Number of Tweets')
      plt.show()
  
      # Plotting Tweets vs. Number of Likes
      plt.figure(figsize=(10, 5))
      plt.bar(tweet_likes.keys(), tweet_likes.values(), color='green')
      plt.xlabel('Tweet Authors')
      plt.ylabel('Number of Likes')
      plt.title('Tweets vs. Number of Likes')
      plt.show()
  
      # Plotting Tweets vs. Number of Retweets
      plt.figure(figsize=(10, 5))
      plt.bar(tweet_retweets.keys(), tweet_retweets.values(), color='red')
      plt.xlabel('Tweet Authors')
      plt.ylabel('Number of Retweets')
      plt.title('Tweets vs. Number of Retweets')
      plt.show()