StandardScaler added

utils/data.py

@@ -50,3 +50,28 @@ def pad_per_step(inputs, pad_len):
         inputs, [[0, 0], [0, 0], [0, pad_len]],
         mode='constant',
         constant_values=0.0)
+
+
+# pylint: disable=attribute-defined-outside-init
+class StandardScaler():
+
+    def set_stats(self, mean, scale):
+        self.mean_ = mean
+        self.scale_ = scale
+
+    def reset_stats(self):
+        delattr(self, 'mean_')
+        delattr(self, 'scale_')
+
+    def transform(self, X):
+        X = np.asarray(X)
+        X -= self.mean_
+        X /= self.scale_
+        return X
+
+    def inverse_transform(self, X):
+        X = np.asarray(X)
+        X *= self.scale_
+        X += self.mean_
+        return X
+