CART implemented

app.py

@@ -1,4 +1,106 @@
 import streamlit as st
+import pandas as pd
+from sklearn.model_selection import train_test_split
+from sklearn.pipeline import Pipeline
+from sklearn.preprocessing import StandardScaler, OneHotEncoder
+from sklearn.impute import SimpleImputer
+from sklearn.compose import ColumnTransformer
+from sklearn import tree
+from sklearn.tree import DecisionTreeClassifier, plot_tree
+import matplotlib as plt
+from sklearn import metrics
+import graphviz as graphviz
 
-x = st.slider('Select a value')
-st.write(x, 'squared is', x * x)
+# load data
+data = pd.read_csv('german_credit.csv')
+data.drop('Unnamed: 0', axis=1, inplace=True)
+
+# recode label
+data['Credit_risk'] = data['Credit_risk'].map({1: 'low', 2: 'high'})
+
+# replace missing values
+data['Saving_accounts'].fillna('unknown', inplace=True)
+data['Checking_account'].fillna('unknown', inplace=True)
+
+# extract variable names
+vars = data.columns.tolist()
+vars.remove('Credit_risk')
+
+# train/test split of data
+X = data[vars]
+y = data['Credit_risk']
+X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.2, random_state=42)
+
+# page title
+st.title('Classification of Credit Risk')
+st.divider()
+
+# header: variables
+st.header('Variables')
+st.markdown(
+"""
+The dataset contains the following variables:
+- Variable 1
+- Variable 2
+- Variable 3
+"""
+)
+st.divider()
+
+# header: data
+st.header('Data')
+data
+st.divider()
+
+# header: predictors
+st.header('Predictors')
+st.write('Please select up to 3 predictors:')
+selected = st.multiselect(
+    '', vars, max_selections=3)
+st.divider()
+
+# header: model
+st.header('Model')
+
+X_train_f = X_train.loc[:, selected]
+
+numeric_features = ["Age", "Job", "Credit_amount", "Duration"]
+numeric_features_selected = list(set(selected) & set(numeric_features))
+numeric_transformer = Pipeline(
+    steps=[("imputer", SimpleImputer())]
+)
+
+categorical_features = ["Sex", "Housing", "Saving_accounts", "Checking_account", "Purpose"]
+categorical_features_selected = list(set(selected) & set(categorical_features))
+categorical_transformer = Pipeline(
+    steps=[
+        ("encoder", OneHotEncoder(handle_unknown="ignore"))
+    ]
+)
+preprocessor = ColumnTransformer(
+    transformers=[
+        ("num", numeric_transformer, numeric_features_selected),
+        ("cat", categorical_transformer, categorical_features_selected),
+    ]
+)
+
+if selected == []:
+    st.write('Please select at least 1 predictor.')
+else:
+    pipe = Pipeline([("preprocessor", preprocessor), ('classifier', tree.DecisionTreeClassifier(max_depth=2))])
+    pipe.fit(X_train_f, y_train)
+    mytree = tree.export_graphviz(pipe.named_steps["classifier"], out_file=None)
+    st.graphviz_chart(mytree)
+
+st.divider()
+
+# header: accuracy
+st.header('Accuracy')
+
+try:
+    score = pipe.score(X_test, y_test)
+    score
+except:
+    st.write('Please select at least 1 predictor.')
+
+st.divider()

german_credit.csv

@@ -0,0 +1,955 @@
+,Age,Sex,Job,Housing,Saving_accounts,Checking_account,Credit_amount,Duration,Purpose,Credit_risk
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