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Created ValueError: y contains previously unseen labels: '' (markdown)

takanotume24 committed 2021-12-20 02:49:33 +0000 commit 5ada49d396c2c502fd56ebb4d9b6d7351b74f59c

				python/pandas/ValueError: y contains previously unseen labels: ''.md
			
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          +LabelEncoderをフィットさせたフィット元データに含まれないデータを用いてエンコードを行おうとしたときに発生。

          +

          +解決策というか、妥協策？

          +[python - sklearn.LabelEncoder with never seen before values - Stack Overflow](https://stackoverflow.com/questions/21057621/sklearn-labelencoder-with-never-seen-before-values)

          +```

          +from sklearn.preprocessing import LabelEncoder

          +

          +le = preprocessing.LabelEncoder()

          +le.fit(X)

          +

          +le_dict = dict(zip(le.classes_, le.transform(le.classes_)))

          +le_dict.get(new_item, None)

          +```

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	1	+LabelEncoderをフィットさせたフィット元データに含まれないデータを用いてエンコードを行おうとしたときに発生。
	2	+
	3	+解決策というか、妥協策？
	4	+[python - sklearn.LabelEncoder with never seen before values - Stack Overflow](https://stackoverflow.com/questions/21057621/sklearn-labelencoder-with-never-seen-before-values)
	5	+```
	6	+from sklearn.preprocessing import LabelEncoder
	7	+
	8	+le = preprocessing.LabelEncoder()
	9	+le.fit(X)
	10	+
	11	+le_dict = dict(zip(le.classes_, le.transform(le.classes_)))
	12	+le_dict.get(new_item, None)
	13	+```
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