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predict metodu

Coddy'nin Makine Öğrenmesine Giriş kursunda ders 11 / 19.

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Görev

Orta

predict 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):
        pass

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