Python(pybrain模块)搭建神经网络BPNN

(一)Python环境下安装pybrain(开源神经网络工具包)

pybrain模块(URL):https://github.com/pybrain/pybrain

pybrain官方文档:http://pybrain.org/docs/

git下载pybrain:git clone https://github.com/pybrain/pybrain

Tip:1.在安装pybrain前,要确保已安装模块scipy+numpy+nose

      2.使用pip install pybrain也可以下载pybrain模块,但是在import pybrain时会报错,如下:

        ('ModuleNotFoundError: No module named 'structure')

      3.模块下载完毕后得到文件夹(pybrain),在该文件中有一个重名的文件夹pybrain,需要把后者复制到site-packages目录下

(二)pybrain搭建BPNN(分类)

import numpy as np
import pandas as pd
import matplotlib.pyplot as plt
from sklearn import datasets
from sklearn import preprocessing
from pybrain.tools.shortcuts import buildNetwork
from pybrain.structure import *
from pybrain.datasets import ClassificationDataSet
from pybrain.supervised.trainers import BackpropTrainer
from sklearn.metrics import accuracy_score

import warnings
warnings.filterwarnings('ignore')

#构建数据集
data = datasets.load_iris()
X,y = data.data,data.target

x = preprocessing.StandardScaler().fit_transform(X)
dataset = ClassificationDataSet(x.shape[1],1,nb_classes=3)
for i in range(len(y)):
    dataset.add

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