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Q4_2.py
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Q4_2.py
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#!/usr/bin/python
# -*- coding:utf-8 -*-
from glob import glob
from collections import defaultdict
import librosa
import numpy as np
from scipy.stats import pearsonr
# %%
import utils # self-defined utils.py file
DB = 'GTZAN'
if DB == 'GTZAN': # dataset with genre label classify at parent directory
FILES = glob(DB + '/wav/*/*.wav')
# print(FILES)
else:
FILES = glob(DB + '/wav/*.wav')
# print(FILES)
GENRE = [g.split('/')[2] for g in glob(DB + '/wav/*')]
print(GENRE)
n_fft = 100 # (ms)
hop_length = 25 # (ms)
# %% Q4_2
if DB == 'GTZAN':
label, pred = defaultdict(list), defaultdict(list)
else:
label, pred = list(), list()
chromagram = list()
gens = list()
for f in FILES:
f = f.replace('\\', '/')
print("file: ", f)
content = utils.read_keyfile(f, '*.lerch.txt')
if (int(content) < 0): continue # skip saving if key not found
if DB == 'GTZAN':
gen = f.split('/')[2]
label[gen].append(utils.LABEL[int(content)])
gens.append(gen)
else:
label.append(utils.LABEL[content])
sr, y = utils.read_wav(f)
gamma = 1000
# gamma = input("gamma (1, 10, 100, 1000): ")
cxx = np.log(1 + gamma * np.abs(librosa.feature.chroma_stft(y=y, sr=sr)))
chromagram.append(cxx) # store into list for further use
chroma_vector = np.sum(cxx, axis=1)
key_ind = np.where(chroma_vector == np.amax(chroma_vector))
key_ind = int(key_ind[0])
# print('key index: ', key_ind)
chroma_vector = utils.rotate(chroma_vector.tolist(), 12 - key_ind)
# print('chroma_vector: ', chroma_vector)
KS = {"major": [6.35, 2.23, 3.48, 2.33, 4.38, 4.09, 2.52, 5.19, 2.39, 3.66, 2.29, 2.88],
"minor": [6.33, 2.68, 3.52, 5.38, 2.60, 3.53, 2.54, 4.75, 3.98, 2.69, 3.34, 3.17]}
r_co_major = pearsonr(chroma_vector, KS["major"])
r_co_minor = pearsonr(chroma_vector, KS["minor"])
# print(r_co_major[0])
# print(r_co_minor[0])
mode = ''
if (r_co_major[0] > r_co_minor[0]):
mode = key_ind
else:
mode = key_ind + 12
mode = utils.lerch_to_str(mode)
# print('mode', mode)
if DB == 'GTZAN':
pred[gen].append(mode)
else:
pred.append('?') # you may ignore this when starting with GTZAN dataset
# print(pred[gen])
print("***** Q4_2 *****")
if DB == 'GTZAN':
label_list, pred_list = list(), list()
print("Genre \taccuracy")
for g in GENRE:
# TODO: Calculate the accuracy for each genre
# Hint: Use label[g] and pred[g]
correct = 0
for acc_len in range(len(label[g])):
if label[g][acc_len] == pred[g][acc_len]:
correct += 1
try:
acc = correct / len(label[g])
except ZeroDivisionError:
acc = 0
print("{:9s}\t{:8.2f}%".format(g, acc))
label_list += label[g]
pred_list += pred[g]
else:
label_list = label
pred_list = pred
# TODO: Calculate the accuracy for all file.
# Hint1: Use label_list and pred_list.
correct_all = 0
for acc_len in range(len(label_list)):
if label_list[acc_len] == pred_list[acc_len]:
correct_all += 1
try:
acc_all = correct_all / len(label_list)
except ZeroDivisionError:
acc_all = 0
##########
print("----------")
print("Overall accuracy:\t{:.2f}%".format(acc_all))
'''
GTZAN
***** Q4_2 *****
----------
gamma = 1
Genre accuracy
pop 0.43%
metal 0.26%
disco 0.32%
blues 0.17%
reggae 0.35%
classical -
rock 0.34%
hiphop 0.12%
country 0.31%
jazz 0.15%
Overall accuracy: 0.28%
----------
gamma = 10
Genre accuracy
pop 0.40%
metal 0.25%
disco 0.27%
blues 0.17%
reggae 0.31%
classical -
rock 0.33%
hiphop 0.15%
country 0.28%
jazz 0.14%
Overall accuracy: 0.26%
----------
gamma = 100
Genre accuracy
pop 0.37%
metal 0.25%
disco 0.27%
blues 0.20%
reggae 0.28%
classical -
rock 0.32%
hiphop 0.12%
country 0.28%
jazz 0.15%
Overall accuracy: 0.25%
----------
gamma = 1000
Genre accuracy
pop 0.37%
metal 0.25%
disco 0.26%
blues 0.21%
reggae 0.30%
classical -
rock 0.32%
hiphop 0.11%
country 0.29%
jazz 0.15%
Overall accuracy: 0.26%
----------
'''