Fixed #239 replace np.roll with slice indexing in stumpy.floss (#241)

Author: manikTharaka

stumpy/floss.py

@@ -481,7 +481,7 @@ def update(self, t):
         This is the implementation for Fast Low-cost Online Semantic
         Segmentation (FLOSS).
         """
-        self._T[:] = np.roll(self._T, -1)
+        self._T[:-1] = self._T[1:]
         self._T[-1] = t
         Q = self._T[-self._m :]
         excl_zone = int(np.ceil(self._m / 4))
@@ -492,7 +492,7 @@ def update(self, t):
         # Egress
         # Remove the first element in the matrix profile index
         # Shift mp up by one and replace the last row with new values
-        self._mp[:] = np.roll(self._mp, -1, axis=0)
+        self._mp[:-1, :] = self._mp[1:, :]
         self._mp[-1, 0] = np.inf
         self._mp[-1, 3] = self._last_idx