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試圖使虹膜數據集適用邏輯迴歸模型,但它不合適。代碼有什麼問題。謝謝。不適合虹膜數據集的邏輯迴歸模型
# Dependencies used: numpy, matpotlib.pyplot, csv
# dataset: Iris
# Binary classification using gradient descent
# python 3.5
# input data matrix = x(99 X 1) # including ones vector
# discrete output data matrix = y(99 X 1)
# parameters matrix = theta(5 X 1)
for j in range(3500):
# hypothesis function
h = 1/(1 + np.exp(-x.dot(theta)))
# gradient descent
theta = theta - (0.00001/m) * np.sum(x.T.dot(h - y)) + (30.0/m)*np.sum(np.sum(theta[1:5, :]**2))
# cost function
cost = -(1/m) * np.sum(y.T.dot(np.log(h)) + (1-y).T.dot(np.log(1-h)))
j_iter.append(cost)
Iter.append(j)
這沒有[mcve]。 – ImportanceOfBeingErnest