Numba riddance

adresses #425 (closed)

• removes numba dependency/usage from saqc
• adds replacement mechanics to make up for performance loss
• see #425 (closed) for an overview over the loss-trade offs (witch are fairly minimal to non-existant in focus use-cases)

saqc/lib/ts_operators.py

@@ -14,7 +14,6 @@ import sys
 import warnings
 from typing import Union
 
-import numba as nb
 import numpy as np
 import numpy.polynomial.polynomial as poly
 import pandas as pd
@@ -208,8 +207,6 @@ def maxGap(in_arr):
     """
     return max(in_arr[0], max(np.diff(in_arr)))
 
-
-@nb.njit
 def _exceedConsecutiveNanLimit(arr, max_consec):
     """
     Check if array has more consecutive NaNs than allowed.
@@ -226,17 +223,8 @@ def _exceedConsecutiveNanLimit(arr, max_consec):
     exceeded: bool
         True if more than allowed consecutive NaNs appear, False otherwise.
     """
-    current = 0
-    idx = 0
-    while idx < arr.size:
-        while idx < arr.size and arr[idx]:
-            current += 1
-            idx += 1
-        if current > max_consec:
-            return True
-        current = 0
-        idx += 1
-    return False
+    views = np.lib.stride_tricks.sliding_window_view(arr, window_shape=max_consec)
+    return np.isnan(views).all(axis=1).any()
 
 
 def validationTrafo(data, max_nan_total, max_nan_consec):