Update app.py

app.py

@@ -7,7 +7,7 @@ import numpy as np
 import matplotlib.pyplot as plt
 from sklearn.ensemble import RandomForestClassifier
 from sklearn.tree import DecisionTreeClassifier
-from sklearn.preprocessing import StandardScaler, MinMaxScaler
+from sklearn.preprocessing import StandardScaler, MinMaxScaler,LabelEncoder
 from sklearn.decomposition import PCA
 from sklearn.metrics import accuracy_score, confusion_matrix
 from scipy.signal import savgol_filter