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labelencoder update

# train and test are pandas.DataFrame's and c is whatever column
le = LabelEncoder()
le.fit(train[c])
test[c] = test[c].map(lambda s: '<unknown>' if s not in le.classes_ else s)
le.classes_ = np.append(le.classes_, '<unknown>')
train[c] = le.transform(train[c])
test[c] = le.transform(test[c])

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labelencoder update

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