tf-31 map-reduce模式

计算设备/map-reduce/tf-31.py

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+# -*- coding: utf-8 -*-
+from collections import Counter
+from cppy.cp_util import *
+from functools import reduce
+
+# map - reduce
+def process_chunk(chunk):
+    # 过滤停用词
+    stop_words = get_stopwords()
+    words = [ w for w in chunk if ( not w in stop_words ) and len(w) >= 3 ]
+    return Counter(words)
+
+
+def merge_counts(count1,count2):
+    sum_counts = count1 + count2
+    return sum_counts
+
+
+@timing_decorator
+def main():
+    # 读取文件内容
+    content = re_split(read_file(testfilepath))
+
+    # 分割文件内容为多个块，每个块由一个进程处理
+    chunk_size = 1000  # 可以根据实际情况调整块大小
+    chunks = [content[i:i + chunk_size] for i in range(0, len(content), chunk_size)]
+
+    # 使用 map 方法和 process_chunk 函数处理每个分区
+    counts_list = list(map(process_chunk, chunks))
+
+    #  使用 reduce 和 merge_counts 函数统计所有分区的词频
+    total_counts = (reduce(merge_counts,counts_list))
+
+    # 输出最高频的n个词
+    print_word_freqs(total_counts.most_common(10))
+
+
+if __name__ == '__main__':
+    main()
+
+
+