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																import numpy as np | 
															
														
														
													
														
															
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																import matplotlib.pyplot as plt | 
															
														
														
													
														
															
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																############################### | 
															
														
														
													
														
															
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																#Datos originales | 
															
														
														
													
														
															
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																############################### | 
															
														
														
													
														
															
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																X = 2 * np.random.rand(100, 1) | 
															
														
														
													
														
															
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																y = 4 + 3 * X + np.random.randn(100,1) | 
															
														
														
													
														
															
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																plt.plot(X,y,".") | 
															
														
														
													
														
															
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																############################### | 
															
														
														
													
														
															
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																X_b = np.c_[np.ones((100,1)), X] #Se agrega x0=1 para cada instancia | 
															
														
														
													
														
															
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																eta = 0.1 #Pasos | 
															
														
														
													
														
															
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																n_itera = 1000 | 
															
														
														
													
														
															
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																m=100 | 
															
														
														
													
														
															
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																theta = np.random.randn(2,1) #Inicialización aleatoria | 
															
														
														
													
														
															
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																for iteracion in range (n_itera): | 
															
														
														
													
														
															
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																	gradiente = 2/m * X_b.T.dot(X_b.dot(theta)-y) | 
															
														
														
													
														
															
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																	theta = theta - eta * gradiente | 
															
														
														
													
														
															
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																print(theta) |