# Full bayes classifier

I have been working on coding bayes classifier. I managed to bring out a working model of naive bayes classifier. Any suggestions on how to convert it to full bayes classifier? I have written down various functions for printing means, covariance matrix and probabilities.

The current model works well and I am able to train and predict various values from csv files. But I would need to convert this to full bayes for fitting my needs better.

``````import csv
import random
import math

import pandas as pd
from sklearn.preprocessing import LabelEncoder

import numpy as np
means = df.groupby([4]).mean()[[0, 1, 2, 3]]
means.columns = ['Feature 1', 'Feature 2', 'Feature 3', 'Feature 4']
print('Means: \n', means, '\n')

le = LabelEncoder()
df[4] = le.fit_transform(df[4])
dataset = df.values.tolist()
print('Covariance matrix: \n', np.cov(df[[0, 1, 2, 3]].T), '\n')

print('Class probabilities: \n', df[4].value_counts()/df.shape[0], '\n')
le = LabelEncoder()
df[4] = le.fit_transform(df[4])
dataset = df.values.tolist()
return dataset

def splitDataset(dataset, splitRatio):
trainSize = int(len(dataset) * splitRatio)
trainSet = []
copy = list(dataset)
while len(trainSet) < trainSize:
index = random.randrange(len(copy))
trainSet.append(copy.pop(index))
return [trainSet, copy]

def separateByClass(dataset):
separated = {}
for i in range(len(dataset)):
vector = dataset[i]
if (vector[-1] not in separated):
separated[vector[-1]] = []
separated[vector[-1]].append(vector)
return separated

def mean(numbers):
return sum(numbers)/float(len(numbers))

def stdev(numbers):
avg = mean(numbers)
variance = sum([pow(x-avg,2) for x in numbers])/float(len(numbers)-1)
return math.sqrt(variance)

def summarize(dataset):
summaries = [(mean(attribute), stdev(attribute)) for attribute in zip(*dataset)]
del summaries[-1]
return summaries

def summarizeByClass(dataset):
separated = separateByClass(dataset)
summaries = {}
for classValue, instances in zip(separated.keys(), separated.values()):
summaries[classValue] = summarize(instances)
return summaries

def calculateProbability(x, mean, stdev):
exponent = math.exp(-(math.pow(x-mean,2)/(2*math.pow(stdev,2))))
return (1 / (math.sqrt(2*math.pi) * stdev)) * exponent

def calculateClassProbabilities(summaries, inputVector):
probabilities = {}
for classValue, classSummaries in zip(summaries.keys(), summaries.values()):
probabilities[classValue] = 1
for i in range(len(classSummaries)):
mean, stdev = classSummaries[i]
x = inputVector[i]
probabilities[classValue] *= calculateProbability(x, mean, stdev)
return probabilities

def predict(summaries, inputVector):
probabilities = calculateClassProbabilities(summaries, inputVector)
bestLabel, bestProb = None, -1
for classValue, probability in zip(probabilities.keys(), probabilities.values()):
if bestLabel is None or probability > bestProb:
bestProb = probability
bestLabel = classValue
return bestLabel

def getPredictions(summaries, testSet):
predictions = []
for i in range(len(testSet)):
result = predict(summaries, testSet[i])
predictions.append(result)
return predictions

def getAccuracy(testSet, predictions):
correct = 0
for i in range(len(testSet)):
if testSet[i][-1] == predictions[i]:
correct += 1
return (correct/float(len(testSet))) * 100.0

def main():
filename = 'iris'
splitRatio = 0.80