def scale(train, test):
scale_f = MinMaxScaler(feature_range=(-1,1))
scale_f = scale_f.fit(train)
train = train.reshape(train.shape[0], train.shape[1])
train_s = scale_f.transform(train)
test = test.reshape(test.shape[0], test.shape[1])
test_s = scale_f.transform(test)
return scale_f, train_s, test_s
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