May-19-2020, 08:37 AM
import sklearn from sklearn.preprocessing import LabelEncoder import pandas as pd import numpy as np data=pd.read_excel('CART.xlsx') le_age=LabelEncoder() le_income=LabelEncoder() le_student=LabelEncoder() le_credit_rating=LabelEncoder() le_buys_computer=LabelEncoder() data['age_n']=le_age.fit_transform(data['age']) data['income_n']=le_income.fit_transform(data['income']) data['student_n']=le_student.fit_transform(data['student']) data['credit_rating_n']=le_credit_rating.fit_transform(data['credit_rating']) data['buys_computer_n']=le_credit_rating.fit_transform(data['buys_computer']) from sklearn.tree import DecisionTreeClassifier clf=DecisionTreeClassifier() dt=clf.fit(x,y) dt DecisionTreeClassifier(class_weight=None,criterion='gini',max_depth=None,max_features=None,max_leaf_nodes=None,min_impurity_decrease=0.0, min_impurity_split=None,min_samples_leaf=1,min_samples_split=2,min_weight_fraction_leaf=0.0,presort=False,random_state=None,splitter='best') from sklearn.tree import export_graphviz from sklearn.externals.six import StringIO from IPython.display import Image import pydotplus dot_data=StringIO() export_graphviz(dt,out_file=dot_data,filled=True,rounded=True,special_characters=True,feature_names=feature_cols, class_names=['0','1']) graph=pydotplus.graph_from_dot_data(dot_data.getvalue()) graph.write_png('buys_computer.png')
Error:---------------------------------------------------------------------------
InvocationException Traceback (most recent call last)
<ipython-input-17-5ddeb7a2766f> in <module>
3 class_names=['0','1'])
4 graph=pydotplus.graph_from_dot_data(dot_data.getvalue())
----> 5 graph.write_png('buys_computer.png')
C:\ProgramData\Anaconda3\lib\site-packages\pydotplus\graphviz.py in <lambda>(path, f, prog)
1808 lambda path,
1809 f=frmt,
-> 1810 prog=self.prog: self.write(path, format=f, prog=prog)
1811 )
1812
C:\ProgramData\Anaconda3\lib\site-packages\pydotplus\graphviz.py in write(self, path, prog, format)
1916
1917 else:
-> 1918 fobj.write(self.create(prog, format))
1919 finally:
1920 if close:
C:\ProgramData\Anaconda3\lib\site-packages\pydotplus\graphviz.py in create(self, prog, format)
1958 if self.progs is None:
1959 raise InvocationException(
-> 1960 'GraphViz\'s executables not found')
1961
1962 if prog not in self.progs:
InvocationException: GraphViz's executables not found
Please help in short out above issue