minor

.gitignore

@@ -2,3 +2,4 @@
 build/
 skais.egg-info/
 *.coverage
+*__pycache__*

requirements.txt

@@ -3,4 +3,5 @@ setuptools~=57.0.0
 numpy~=1.19.5
 numba~=0.53.1
 scipy~=1.5.4
-POT~=0.7.0
\ No newline at end of file
+hmmlearn~=0.2.6
+scikit-learn~=1.0.1
\ No newline at end of file

skais/ais/ais_trajectory.py

@@ -5,6 +5,7 @@ import numpy as np
 from numba import jit
 from scipy.interpolate import interp1d
 
+from skais.stats.angluar import angular_dispersion
 from skais.utils.geography import great_circle
 from skais.utils.stats import calc_std_dev
 
@@ -171,6 +172,15 @@ def l2_angle(dat, radius):
     return l2
 
 
+def angle_dispersion(dat, radius):
+    l2 = np.zeros(dat.shape)
+
+    dat = np.concatenate([np.full(radius, dat[0]), dat, np.full(radius, dat[-1])])
+    for i in range(radius, dat.shape[0] - radius):
+        data = dat[i - radius:i + radius + 1]
+        l2[i - radius] = angular_dispersion(np.radians(data))
+
+
 class AISTrajectory:
     def __init__(self, df, interpolation_time=None):
         df = df.drop_duplicates(subset=['ts_sec'])
@@ -267,6 +277,16 @@ class AISTrajectory:
             stds[:radius] = np.nan
             self.df[f"{field}_std"] = stds
 
+    def compute_all_dispersions(self, radius):
+        fields = ['cog', 'heading', 'angles_diff']
+        for field in fields:
+            if field in self.df.columns:
+                dat = self.df[field].to_numpy()
+                disp = angle_dispersion(dat, radius)
+                disp[-radius:] = np.nan
+                disp[:radius] = np.nan
+                self.df[f"{field}_disp"] = disp
+
     def compute_position_features(self, radius):
         dat = np.stack([self.df.longitude.to_numpy(), self.df.latitude.to_numpy()], axis=1)
         std = compute_position_angle_std(dat, radius)

skais/learn/hmm_gmm_classifier.py

 import random
 
 from hmmlearn.hmm import GMMHMM, GaussianHMM
-from matplotlib import pyplot as plt
 from numba import jit
 from scipy import linalg
 from sklearn.datasets import make_spd_matrix