predict metodu
Coddy'nin Makine Öğrenmesine Giriş kursunda ders 11 / 19.
Görev
Ortapredict metodu, her bir yeni noktanın diğer tüm centroid'lere olan mesafesini hesaplar. Nokta, en yakın centroid'in kümesine atanır.
Her bir yeni nokta için, en yakın centroid'in indeksini atayın. Tahmin edilen atanan kümelerin listesini döndürün.
Kendin dene
def euclidian_distance(point_a, point_b):
return (sum([(point_a[i] - point_b[i])**2 for i in range(len(point_a))]))**0.5
class KMeans:
def __init__(self, k):
self.k = k
def find_cluster_centroid(self, cluster_points):
# Write your code here
centroid = []
for point in cluster_points:
for dim, value in enumerate(point):
if len(centroid) - 1 < dim:
centroid.append(0)
centroid[dim] += value
for i in range(len(centroid)):
centroid[i] /= len(cluster_points)
return centroid
def fit(self, X_train):
# Write you code here
self.centroids = [X_train[i] for i in range(2, self.k*2 + 1, 2)]
while True:
# Assing each point to centroid
points_clusters = []
for point in X_train:
distances = []
for centroid in self.centroids:
dist_to_point = euclidian_distance(centroid, point)
distances.append(dist_to_point)
closest_centroid_index = distances.index(min(distances))
points_clusters.append((point, closest_centroid_index))
# Update centroids
clusters = {}
for point, cluster in points_clusters:
if cluster not in clusters:
clusters[cluster] = []
clusters[cluster].append(point)
new_centroids = [None]*self.k
for cluster, points in clusters.items():
new_centroids[cluster] = self.find_cluster_centroid(points)
# Check if converged
total_dist = 0
for i in range(len(new_centroids)):
total_dist += euclidian_distance(new_centroids[i], self.centroids[i])
if total_dist < 0.01:
break
self.centroids = new_centroids
def predict(self, X_test):
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