100 language processing knocks (2020): 39

"""
37.Top 10 words that frequently co-occur with "cat"
Display 10 words that often co-occur with "cat" (high frequency of co-occurrence) and their frequency of appearance in a graph (for example, a bar graph).


sentence_list:
[[{'surface': '', 'base': '*', 'pos': 'BOS/EOS', 'pos1': '*'},
  {'surface': 'one', 'base': 'one', 'pos': 'noun', 'pos1': 'number'},
  {'surface': '', 'base': '*', 'pos': 'BOS/EOS', 'pos1': '*'}],
 [{'surface': '', 'base': '*', 'pos': 'BOS/EOS', 'pos1': '*'},
  {'surface': 'I', 'base': 'I', 'pos': 'noun', 'pos1': '代noun'},
  {'surface': 'Is', 'base': 'Is', 'pos': 'Particle', 'pos1': '係Particle'},
  {'surface': 'Cat', 'base': 'Cat', 'pos': 'noun', 'pos1': 'General'},
  {'surface': 'so', 'base': 'Is', 'pos': 'Auxiliary verb', 'pos1': '*'},
  {'surface': 'is there', 'base': 'is there', 'pos': 'Auxiliary verb', 'pos1': '*'},
  {'surface': '。', 'base': '。', 'pos': 'symbol', 'pos1': 'Kuten'},
  {'surface': '', 'base': '*', 'pos': 'BOS/EOS', 'pos1': '*'}],

Memo:
    -Co-occurrence frequency: https://www.jtp.co.jp/techport/2018-04-18-001/
"""
from collections import defaultdict
from typing import List

import matplotlib.pyplot as plt

import utils

plt.style.use("ggplot")
plt.rcParams["font.family"] = "Hiragino Mincho ProN"  #Japanese support


def get_co_occurrence(sentence_list: List[List[dict]]) -> list:
    sents = [
        [word["surface"] for word in sent[1:-1]] for sent in sentence_list
    ]  # [['one'], ['I', 'Is', 'Cat', 'so', 'is there', '。']]
    counter = defaultdict(int)

    for sent in sents:
        if "Cat" in sent:
            for word in sent:
                counter[word] += 1

    del counter["Cat"]

    sorted_counter = {
        k: v for k, v in sorted(counter.items(), key=lambda item: item[1], reverse=True)
    }
    return list(sorted_counter.items())


def plot_co_occurrence(x: list, y: list) -> None:
    x_pos = [i for i, _ in enumerate(x)]

    plt.bar(x, y)
    plt.xlabel("Term")
    plt.ylabel("Frequency")
    plt.title("Co-occurrence with 'Cat'")

    plt.xticks(x_pos, x)

    plt.show()


sentence_list = utils.read_json("30_neko_mecab.json")
counter = get_co_occurrence(sentence_list)
# [('of', 391), ('Is', 272), ('、', 252), ('To', 250), ('To', 232)]

x = [word[0] for word in counter[:10]]
y = [word[1] for word in counter[:10]]
plot_co_occurrence(x, y)
# ![image-20200527193140109](https://raw.githubusercontent.com/LearnXu/images/master/imgs/image-20200527193140109.png)

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