From fa818e9bf7b8448adc2a513f9f9b28cf2c07ac59 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Petr=C3=B4nio=20C=C3=A2ndido=20de=20Lima=20e=20Silva?=
 <petronio.candido@gmail.com>
Date: Fri, 4 Mar 2022 08:58:51 -0300
Subject: [PATCH] Update roi.py

---
 pyFTS/common/transformations/roi.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/pyFTS/common/transformations/roi.py b/pyFTS/common/transformations/roi.py
index 293fbf1..6e84497 100644
--- a/pyFTS/common/transformations/roi.py
+++ b/pyFTS/common/transformations/roi.py
@@ -1,4 +1,5 @@
 from pyFTS.common.transformations.transformation import Transformation 
+import numpy as np
 
 
 class ROI(Transformation):
@@ -20,4 +21,4 @@ class ROI(Transformation):
 
     def inverse(self, data, param=None, **kwargs):
         modified = [(param[i - 1] * data[i]) + param[i - 1] for i in np.arange(1, len(data))]
-        return modified
\ No newline at end of file
+        return modified