Python ball_tree.BallTree类代码示例

def test_ball_tree_pickle():
    rng = check_random_state(0)
    X = rng.random_sample((10, 3))

    bt1 = BallTree(X, leaf_size=1)
    # Test if BallTree with callable metric is picklable
    bt1_pyfunc = BallTree(X, metric=dist_func, leaf_size=1, p=2)

    ind1, dist1 = bt1.query(X)
    ind1_pyfunc, dist1_pyfunc = bt1_pyfunc.query(X)

    def check_pickle_protocol(protocol):
        s = pickle.dumps(bt1, protocol=protocol)
        bt2 = pickle.loads(s)

        s_pyfunc = pickle.dumps(bt1_pyfunc, protocol=protocol)
        bt2_pyfunc = pickle.loads(s_pyfunc)

        ind2, dist2 = bt2.query(X)
        ind2_pyfunc, dist2_pyfunc = bt2_pyfunc.query(X)

        assert_array_almost_equal(ind1, ind2)
        assert_array_almost_equal(dist1, dist2)

        assert_array_almost_equal(ind1_pyfunc, ind2_pyfunc)
        assert_array_almost_equal(dist1_pyfunc, dist2_pyfunc)

        assert isinstance(bt2, BallTree)

    for protocol in (0, 1, 2):
        check_pickle_protocol(protocol)

def similar_products2(deep_f):
	qs = Product.objects.all()
	df=read_frame(qs)
	df['idx'] = range(1, len(df) + 1)
	feature_list=[]
	asin_list=[]

	for prod in qs:
		feature_list.append(prod.get_features())
		asin_list.append(prod.asin)
	
		
	nparray = np.asarray(feature_list)
	#print nparray
	tree = BallTree(nparray)              
	dist, ind = tree.query(deep_f, k=5)
	print ind
	index = ind[0]
	recom = index[0:]
	recommended_asins =[];
	
	for i in recom:
		recommended_asins.append(asin_list[i])
	recommended_prods = Product.objects.filter(asin__in = recommended_asins)
	return recommended_prods

#    image_train = graphlab.SFrame(data=df)
#    cur_prod = image_train[18:19]
#    print cur_prod
#    print image_train
#    knn_model = graphlab.nearest_neighbors.create(image_train, features = ['features'],label = 'asin',distance = 'levenshtein',method = 'ball_tree')
#    knn_model.save('my_knn')
#    #knn_model= graphlab.load_model('my_knn')
#    #print knn_model.query(cur_prod)
#    #knn_model = graphlab.nearest_neighbors.create(image_train, features = ['features'],label = 'keywords')

def test_ball_tree_pickle():
    np.random.seed(0)
    X = np.random.random((10, 3))

    bt1 = BallTree(X, leaf_size=1)
    # Test if BallTree with callable metric is picklable
    bt1_pyfunc = BallTree(X, metric=dist_func, leaf_size=1, p=2)

    ind1, dist1 = bt1.query(X)
    ind1_pyfunc, dist1_pyfunc = bt1_pyfunc.query(X)

    def check_pickle_protocol(protocol):
        s = pickle.dumps(bt1, protocol=protocol)
        bt2 = pickle.loads(s)

        s_pyfunc = pickle.dumps(bt1_pyfunc, protocol=protocol)
        bt2_pyfunc = pickle.loads(s_pyfunc)

        ind2, dist2 = bt2.query(X)
        ind2_pyfunc, dist2_pyfunc = bt2_pyfunc.query(X)

        assert_array_almost_equal(ind1, ind2)
        assert_array_almost_equal(dist1, dist2)

        assert_array_almost_equal(ind1_pyfunc, ind2_pyfunc)
        assert_array_almost_equal(dist1_pyfunc, dist2_pyfunc)

    for protocol in (0, 1, 2):
        yield check_pickle_protocol, protocol

def similar_products(product):
	qs = Product.objects.all()
	df=read_frame(qs)
	df['idx'] = range(1, len(df) + 1)
	feature_list=[]
	asin_list=[]
	product_index = 0
	inn=0
	for prod in qs:
		feature_list.append(prod.get_features())
		asin_list.append(prod.asin)
		if prod.asin == product.asin:
			product_index = inn
		inn+=1
		
	nparray = np.asarray(feature_list)
	#print nparray
	tree = BallTree(nparray)              
	dist, ind = tree.query(nparray[product_index], k=5)
	print ind
	index = ind[0]
	recom = index[1:]
	recommended_asins =[];
	
	for i in recom:
		recommended_asins.append(asin_list[i])
	recommended_prods = Product.objects.filter(asin__in = recommended_asins)
	return recommended_prods

    def check_neighbors(dualtree, breadth_first, k, metric, kwargs):
        bt = BallTree(X, leaf_size=1, metric=metric, **kwargs)
        dist1, ind1 = bt.query(Y, k, dualtree=dualtree, breadth_first=breadth_first)
        dist2, ind2 = brute_force_neighbors(X, Y, k, metric, **kwargs)

        # don't check indices here: if there are any duplicate distances,
        # the indices may not match.  Distances should not have this problem.
        assert_array_almost_equal(dist1, dist2)

def test_query_haversine():
    rng = check_random_state(0)
    X = 2 * np.pi * rng.random_sample((40, 2))
    bt = BallTree(X, leaf_size=1, metric='haversine')
    dist1, ind1 = bt.query(X, k=5)
    dist2, ind2 = brute_force_neighbors(X, X, k=5, metric='haversine')

    assert_array_almost_equal(dist1, dist2)
    assert_array_almost_equal(ind1, ind2)

def test_query_haversine():
    np.random.seed(0)
    X = 2 * np.pi * np.random.random((40, 2))
    bt = BallTree(X, leaf_size=1, metric='haversine')
    dist1, ind1 = bt.query(X, k=5)
    dist2, ind2 = brute_force_neighbors(X, X, k=5, metric='haversine')

    assert_array_almost_equal(dist1, dist2)
    assert_array_almost_equal(ind1, ind2)

def test_ball_tree_kde(kernel, h, rtol, atol, breadth_first, n_samples=100,
                       n_features=3):
    rng = np.random.RandomState(0)
    X = rng.random_sample((n_samples, n_features))
    Y = rng.random_sample((n_samples, n_features))
    bt = BallTree(X, leaf_size=10)

    dens_true = compute_kernel_slow(Y, X, kernel, h)

    dens = bt.kernel_density(Y, h, atol=atol, rtol=rtol,
                             kernel=kernel,
                             breadth_first=breadth_first)
    assert_allclose(dens, dens_true,
                    atol=atol, rtol=max(rtol, 1e-7))

def test_gaussian_kde(n_samples=1000):
    # Compare gaussian KDE results to scipy.stats.gaussian_kde
    from scipy.stats import gaussian_kde
    rng = check_random_state(0)
    x_in = rng.normal(0, 1, n_samples)
    x_out = np.linspace(-5, 5, 30)

    for h in [0.01, 0.1, 1]:
        bt = BallTree(x_in[:, None])
        gkde = gaussian_kde(x_in, bw_method=h / np.std(x_in))

        dens_bt = bt.kernel_density(x_out[:, None], h) / n_samples
        dens_gkde = gkde.evaluate(x_out)

        assert_array_almost_equal(dens_bt, dens_gkde, decimal=3)

def test_ball_tree_query(metric, k, dualtree, breadth_first):
    rng = check_random_state(0)
    X = rng.random_sample((40, DIMENSION))
    Y = rng.random_sample((10, DIMENSION))

    kwargs = METRICS[metric]

    bt = BallTree(X, leaf_size=1, metric=metric, **kwargs)
    dist1, ind1 = bt.query(Y, k, dualtree=dualtree,
                           breadth_first=breadth_first)
    dist2, ind2 = brute_force_neighbors(X, Y, k, metric, **kwargs)

    # don't check indices here: if there are any duplicate distances,
    # the indices may not match.  Distances should not have this problem.
    assert_array_almost_equal(dist1, dist2)

def test_ball_tree_query_metrics(metric):
    rng = check_random_state(0)
    if metric in BOOLEAN_METRICS:
        X = rng.random_sample((40, 10)).round(0)
        Y = rng.random_sample((10, 10)).round(0)
    elif metric in DISCRETE_METRICS:
        X = (4 * rng.random_sample((40, 10))).round(0)
        Y = (4 * rng.random_sample((10, 10))).round(0)

    k = 5

    bt = BallTree(X, leaf_size=1, metric=metric)
    dist1, ind1 = bt.query(Y, k)
    dist2, ind2 = brute_force_neighbors(X, Y, k, metric)
    assert_array_almost_equal(dist1, dist2)

def test_ball_tree_pickle():
    import pickle
    np.random.seed(0)
    X = np.random.random((10, 3))
    bt1 = BallTree(X, leaf_size=1)
    ind1, dist1 = bt1.query(X)

    def check_pickle_protocol(protocol):
        s = pickle.dumps(bt1, protocol=protocol)
        bt2 = pickle.loads(s)
        ind2, dist2 = bt2.query(X)
        assert_allclose(ind1, ind2)
        assert_allclose(dist1, dist2)

    for protocol in (0, 1, 2):
        yield check_pickle_protocol, protocol

def test_ball_tree_query_radius(n_samples=100, n_features=10):
    np.random.seed(0)
    X = 2 * np.random.random(size=(n_samples, n_features)) - 1
    query_pt = np.zeros(n_features, dtype=float)

    eps = 1E-15  # roundoff error can cause test to fail
    bt = BallTree(X, leaf_size=5)
    rad = np.sqrt(((X - query_pt) ** 2).sum(1))

    for r in np.linspace(rad[0], rad[-1], 100):
        ind = bt.query_radius(query_pt, r + eps)[0]
        i = np.where(rad <= r + eps)[0]

        ind.sort()
        i.sort()

        assert_array_almost_equal(i, ind)

def test_gaussian_kde(n_samples=1000):
    """Compare gaussian KDE results to scipy.stats.gaussian_kde"""
    from scipy.stats import gaussian_kde
    np.random.seed(0)
    x_in = np.random.normal(0, 1, n_samples)
    x_out = np.linspace(-5, 5, 30)

    for h in [0.01, 0.1, 1]:
        bt = BallTree(x_in[:, None])
        try:
            gkde = gaussian_kde(x_in, bw_method=h / np.std(x_in))
        except TypeError:
            raise SkipTest("Old version of scipy, doesn't accept explicit bandwidth.")

        dens_bt = bt.kernel_density(x_out[:, None], h) / n_samples
        dens_gkde = gkde.evaluate(x_out)

        assert_array_almost_equal(dens_bt, dens_gkde, decimal=3)

def test_ball_tree_query_radius_distance(n_samples=100, n_features=10):
    np.random.seed(0)
    X = 2 * np.random.random(size=(n_samples, n_features)) - 1
    query_pt = np.zeros(n_features, dtype=float)

    eps = 1E-15  # roundoff error can cause test to fail
    bt = BallTree(X, leaf_size=5)
    rad = np.sqrt(((X - query_pt) ** 2).sum(1))

    for r in np.linspace(rad[0], rad[-1], 100):
        ind, dist = bt.query_radius(query_pt, r + eps, return_distance=True)

        ind = ind[0]
        dist = dist[0]

        d = np.sqrt(((query_pt - X[ind]) ** 2).sum(1))

        assert_array_almost_equal(d, dist)