Merge branch 'main' into faiss

train.py

@@ -17,6 +17,78 @@
 import cv2
 import os
 
+from PIL import Image
+from sklearn.metrics import roc_auc_score
+from torch import nn
+import pytorch_lightning as pl
+from sklearn.metrics import confusion_matrix
+import pickle
+from sampling_methods.kcenter_greedy import kCenterGreedy
+from sklearn.random_projection import SparseRandomProjection
+from sklearn.neighbors import NearestNeighbors
+from scipy.ndimage import gaussian_filter
+
+
+def distance_matrix(x, y=None, p=2):  # pairwise distance of vectors
+
+    y = x if type(y) == type(None) else y
+
+    n = x.size(0)
+    m = y.size(0)
+    d = x.size(1)
+
+    x = x.unsqueeze(1).expand(n, m, d)
+    y = y.unsqueeze(0).expand(n, m, d)
+
+    dist = torch.pow(x - y, p).sum(2)
+
+    return dist
+
+
+class NN():
+
+    def __init__(self, X=None, Y=None, p=2):
+        self.p = p
+        self.train(X, Y)
+
+    def train(self, X, Y):
+        self.train_pts = X
+        self.train_label = Y
+
+    def __call__(self, x):
+        return self.predict(x)
+
+    def predict(self, x):
+        if type(self.train_pts) == type(None) or type(self.train_label) == type(None):
+            name = self.__class__.__name__
+            raise RuntimeError(f"{name} wasn't trained. Need to execute {name}.train() first")
+
+        dist = distance_matrix(x, self.train_pts, self.p) ** (1 / self.p)
+        labels = torch.argmin(dist, dim=1)
+        return self.train_label[labels]
+
+class KNN(NN):
+
+    def __init__(self, X=None, Y=None, k=3, p=2):
+        self.k = k
+        super().__init__(X, Y, p)
+
+    def train(self, X, Y):
+        super().train(X, Y)
+        if type(Y) != type(None):
+            self.unique_labels = self.train_label.unique()
+
+    def predict(self, x):
+
+
+        # dist = distance_matrix(x, self.train_pts, self.p) ** (1 / self.p)
+        dist = torch.cdist(x, self.train_pts, self.p)
+
+        knn = dist.topk(self.k, largest=False)
+
+
+        return knn
+
 def copy_files(src, dst, ignores=[]):
     src_files = os.listdir(src)
     for file_name in src_files: