pythonは方策決定樹の画図を実現します.

記事の参照先:http://blog.csdn.net/wzmsltw/article/details/51039928

# -*- coding: utf-8 -*-
"""
Created on Wed Sep 27 14:52:51 2017

@author: Administrator
"""

import matplotlib.pyplot as plt  
decisionNode=dict(boxstyle="sawtooth",fc="0.8")  
leafNode=dict(boxstyle="round4",fc="0.8")  
arrow_args=dict(arrowstyle="maxDepth:  
            maxDepth=thisDepth  
    return maxDepth  
  
#     
def plotNode(nodeTxt,centerPt,parentPt,nodeType):  
    createPlot.ax1.annotate(nodeTxt,xy=parentPt,xycoords='axes fraction',xytext=centerPt,textcoords='axes fraction',va="center", ha="center",bbox=nodeType,arrowprops=arrow_args) 
      
    
  
#         
def plotMidText(cntrPt,parentPt,txtString):  
    lens=len(txtString)  
    xMid=(parentPt[0]+cntrPt[0])/2.0-lens*0.002  
    yMid=(parentPt[1]+cntrPt[1])/2.0  
    createPlot.ax1.text(xMid,yMid,txtString)  
      
def plotTree(myTree,parentPt,nodeTxt):  
    numLeafs=getNumLeafs(myTree)  
    depth=getTreeDepth(myTree)  
    firstStr=myTree.keys()[0]  
    cntrPt=(plotTree.x0ff+(1.0+float(numLeafs))/2.0/plotTree.totalW,plotTree.y0ff)  
    plotMidText(cntrPt,parentPt,nodeTxt)  
    plotNode(firstStr,cntrPt,parentPt,decisionNode)  
    secondDict=myTree[firstStr]  
    plotTree.y0ff=plotTree.y0ff-1.0/plotTree.totalD  
    for key in secondDict.keys():  
        if type(secondDict[key]).__name__=='dict':  
            plotTree(secondDict[key],cntrPt,str(key))  
        else:  
            plotTree.x0ff=plotTree.x0ff+1.0/plotTree.totalW  
            plotNode(secondDict[key],(plotTree.x0ff,plotTree.y0ff),cntrPt,leafNode)  
            plotMidText((plotTree.x0ff,plotTree.y0ff),cntrPt,str(key))  
    plotTree.y0ff=plotTree.y0ff+1.0/plotTree.totalD  
  
def createPlot(inTree):  
    fig=plt.figure(1,facecolor='white')  
    fig.clf()  
    axprops=dict(xticks=[],yticks=[])  
    createPlot.ax1=plt.subplot(111,frameon=False,**axprops)  
    plotTree.totalW=float(getNumLeafs(inTree))  
    plotTree.totalD=float(getTreeDepth(inTree))  
    plotTree.x0ff=-0.5/plotTree.totalW  
    plotTree.y0ff=1.0  
    plotTree(inTree,(0.5,1.0),'')  
    plt.show() 
###############    
tree={'navel': {'even': 0L,
  'little_sinking': {'root': {'curl_up': 0L,
    'little_curl_up': {'color': {'black': {'texture': {'blur': 1L,
        'distinct': 0L,
        'little_blur': 1L}},
      'dark_green': 1L,
      'light_white': 1L}},
    'stiff': 1L}},
  'sinking': {'color': {'black': 1L, 'dark_green': 1L, 'light_white': 0L}}}}
createPlot(tree)

結果: