Os [89] # Import_Decision_tree_classifier from sklearn.tree import DecisionTreeClassifier # Initialize_decision Tree_classifier model Decision Tree Classifier (criterion="gini", random_state=1) # Fit decision tree on the Train_Data model.fit(x train, y train) NameError Traceback (most recent call last) in () 6 7 # Fit decision tree on the_Train_Data ----> 8 model.fit(x_train, y_train) NameError: name 'x_train' is not defined