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python - 从头开始的神经网络 - 预测单个示例

问题描述

这是我从 Coursera Deep Learning Specialization 修改的神经网络，用于在包含扁平化训练数据数组的数据集上进行训练：

%reset -s -f

import numpy as np
import math

def sigmoid(x):
    return 1 / (1 + np.exp(-x))

def initialize_with_zeros(dim):

    w = np.zeros(shape=(dim, 1))
    b = 0

    return w, b

X = np.array([[1,1,1,1],[1,0,1,0] , [1,1,1,0], [0,0,0,0], [0,1,0,0], [0,1,0,1]])
Y = np.array([[1,0,1,1,1,1]])

X = X.reshape(X.shape[0], -1).T
Y = Y.reshape(Y.shape[0], -1).T

print('X shape' , X.shape)
print('Y shape' , Y.shape)

b = 1
w, b = initialize_with_zeros(4)

def propagate(w, b, X, Y) : 

    m = X.shape[1]

    A = sigmoid(np.dot(w.T, X) + b)  # compute activation
    cost = (- 1 / m) * np.sum(Y * np.log(A) + (1 - Y) * (np.log(1 - A)))  # compute cost
    dw = (1./m)*np.dot(X,((A-Y).T))
    db = (1./m)*np.sum(A-Y, axis=1)
    cost = np.squeeze(cost)

    grads = {"dw": dw,
             "db": db}

    return grads, cost

propagate(w , b , X , Y)

learning_rate = .001
costs = []

def optimize(w , b, X , Y) :
    for i in range(2):

        grads, cost = propagate(w=w, b=b, X=X, Y=Y)

        dw = grads["dw"]
        db = grads["db"]

        w = w - learning_rate*dw
        b = b -  learning_rate*db

        if i % 100 == 0:
            costs.append(cost)

    return w , b

w , b = optimize(w , b , X , Y)

def predict(w, b, X):

    m = 6
    Y_prediction = np.zeros((1,m))
#     w = w.reshape(X.shape[0], 1)

    A = sigmoid(np.dot(w.T, X) + b)
    for i in range(A.shape[1]):

        if A[0, i] >= 0.5:
            Y_prediction[0, i] = 1

        else:
            Y_prediction[0, i] = 0

    return Y_prediction

predict(w , b, X)

这按预期工作，但我很难预测一个例子。

如果我使用：

predict(w , b, X[0])

返回错误：

ValueError: shapes (6,4) and (6,) not aligned: 4 (dim 1) != 6 (dim 0)

如何重新安排矩阵运算以预测单个实例？

标签： pythonnumpytensorflowdeep-learningpytorch

解决方案

尝试

predict(w, b, X[:1])

看起来你的predict函数应该是二维X的，当只传递一个时，X它应该有一个单一的第二维（即 shape=(6,1)）而不是一个单一的维度（即 shape=(6,)） .

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