Add some sort of verification of incoming and outgoing data in analytics #227 (#281)

* fix find_confidence

* fix get_interval

* fix subtract_min_without_nan

* fix substract and get_convolve

analytics/analytics/utils/common.py

@@ -4,6 +4,7 @@ import scipy.signal
 from scipy.fftpack import fft
 from scipy.signal import argrelextrema
 from scipy.stats import gaussian_kde
+from typing import Union
 import utils
 
 def exponential_smoothing(series, alpha):
@@ -267,7 +268,7 @@ def best_pat(pat_list, data, dir):
         new_pat_list.append(ind)
     return new_pat_list
 
-def find_nan_indexes(segment):
+def find_nan_indexes(segment: pd.Series) -> list:
     nan_list = np.isnan(segment)
     nan_indexes = []
     for i, val in enumerate(nan_list):
@@ -275,12 +276,23 @@ def find_nan_indexes(segment):
             nan_indexes.append(i)
     return nan_indexes
 
-def nan_to_zero(segment, nan_list):
+def check_nan_values(segment: Union[pd.Series, list]) -> Union[pd.Series, list]:
+    nan_list = utils.find_nan_indexes(segment)
+    if len(nan_list) > 0:
+        segment = utils.nan_to_zero(segment, nan_list)
+    return segment
+
+def nan_to_zero(segment: Union[pd.Series, list], nan_list: list) -> Union[pd.Series, list]:
+    if type(segment) == pd.Series:
+        for val in nan_list:
+            segment.values[val] = 0
+    else:
         for val in nan_list:
             segment[val] = 0
     return segment
 
 def find_confidence(segment: pd.Series) -> float:
+    segment = utils.check_nan_values(segment)
     segment_min = min(segment)
     segment_max = max(segment)
     return 0.2 * (segment_max - segment_min)
@@ -288,10 +300,19 @@ def find_confidence(segment: pd.Series) -> float:
 def get_interval(data: pd.Series, center: int, window_size: int) -> pd.Series:
     left_bound = center - window_size
     right_bound = center + window_size + 1
+    if left_bound < 0:
+        left_bound = 0
+    if right_bound > len(data):
+        right_bound = len(data)
     return data[left_bound: right_bound]
 
-def subtract_min_without_nan(segment: list) -> list:
-    if not np.isnan(min(segment)):
+def subtract_min_without_nan(segment: pd.Series) -> pd.Series:
+    if len(segment) == 0:
+        return []
+    nan_list = utils.find_nan_indexes(segment)
+    if len(nan_list) > 0:
+        return segment
+    else:
         segment = segment - min(segment)        
     return segment
 
@@ -301,6 +322,7 @@ def get_convolve(segments: list, av_model: list, data: pd.Series, window_size: i
     for segment in segments:
         labeled_segment = utils.get_interval(data, segment, window_size)
         labeled_segment = utils.subtract_min_without_nan(labeled_segment)
+        labeled_segment = utils.check_nan_values(labeled_segment)
         auto_convolve = scipy.signal.fftconvolve(labeled_segment, labeled_segment)
         convolve_segment = scipy.signal.fftconvolve(labeled_segment, av_model)
         convolve_list.append(max(auto_convolve))