import numpy as np
import matplotlib.pyplot as plt
import pandas as pd
dataset = pd.read_csv('iris.csv')
X = dataset.iloc[:,:4]
y = dataset.iloc[:,4]
from sklearn.preprocessing import OneHotEncoder
encoder = OneHotEncoder(sparse=False)
y=encoder.fit_transform(y.values.reshape(-1,1))
from sklearn.model_selection import train_test_split
X_train, X_test, y_train, y_test = train_test_split(X, y, test_size = 0.25, random_state = 0)
from sklearn.preprocessing import StandardScaler
sc = StandardScaler()
X_train = sc.fit_transform(X_train)
X_test = sc.transform(X_test)
from sklearn.naive_bayes import GaussianNB
classifier = GaussianNB()
classifier.fit(X_train, y_train)
I am getting these small errors which hinder my projects. Can you please provide a solution to this error? Also how can I avoid these mistakes?