回答編集履歴
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追記
test
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@@ -13,3 +13,103 @@
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```
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各文書ごとに特徴語を取り出したければ、こんな感じでいけると思います。
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### 追記
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せっかくなので簡単なサンプルを。
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```python
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import numpy as np
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from sklearn.feature_extraction.text import TfidfVectorizer
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from sklearn.datasets import fetch_20newsgroups
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news20 = fetch_20newsgroups()
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vectorizer = TfidfVectorizer(min_df=0.03)
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tfidf = vectorizer.fit_transform(news20.data[:1000]).toarray()
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feature_names = np.array(vectorizer.get_feature_names())
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index = tfidf.argsort(axis=1)[:,::-1]
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feature_words = [feature_names[doc] for doc in index]
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n = 5 # top何単語取るか
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m = 10 # 何記事サンプルとして抽出するか
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targets = np.array(news20.target_names)[news20.target[:m]]
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for fwords, target in zip(feature_words, targets):
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print(target)
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print(fwords[:n])
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""" =>
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rec.autos
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['car' 'was' 'this' 'the' 'where']
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comp.sys.mac.hardware
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['washington' 'add' 'guy' 'speed' 'call']
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comp.sys.mac.hardware
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['the' 'display' 'anybody' 'heard' 'disk']
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comp.graphics
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['division' 'chip' 'systems' 'computer' 'four']
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sci.space
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['error' 'known' 'tom' 'memory' 'the']
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talk.politics.guns
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['of' 'the' 'com' 'to' 'says']
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sci.med
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['thanks' 'couldn' 'instead' 'file' 'everyone']
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comp.sys.ibm.pc.hardware
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['chip' 'is' 'fast' 'ibm' 'bit']
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comp.os.ms-windows.misc
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['win' 'help' 'please' 'appreciated' 'figure']
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comp.sys.mac.hardware
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['the' 'file' 'lost' 've' 'it']
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"""
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```
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それっぽく動いているようです。
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