import os
import gdown
import zipfile
import numpy as np
from configobj import ConfigObj
from compiam.utils import get_logger, WORKDIR
logger = get_logger(__name__)
[docs]class CAEWrapper:
"""
Wrapper for the Complex Autoencoder found at https://github.com/SonyCSLParis/cae-invar#quick-start
specifically for the task of embedding audio to learnt CAE features.
This wrapper is used for inference and it is not trainable. Please initialize it using
compiam.load_model()
"""
def __init__(self, model_path, conf_path, spec_path, device="cpu"):
"""Initialise wrapper with trained model from original CAE implementation
:param model_path: Path to .save model trained using original CAE implementation.
:param conf_path: Path to .ini conf used to train model at <model_path>.
:param spec_path: Path to .cfg configuration spec.
:param map_location: cpu or gpu [optional, defaults to cpu].
"""
### IMPORTING OPTIONAL DEPENDENCIES
try:
global torch
import torch
global to_cqt_repr, standardize
from compiam.melody.pattern.sancara_search.complex_auto.cqt import (
to_cqt_repr,
standardize,
)
global Complex
from compiam.melody.pattern.sancara_search.complex_auto.complex import (
Complex,
)
global cuda_variable
from compiam.melody.pattern.sancara_search.complex_auto.util import (
cuda_variable,
)
except:
raise ImportError(
"In order to use this tool you need to have torch installed. "
"Please install torch using: pip install torch"
)
###
if not device:
self.device = "cuda" if torch.cuda.is_available() else "cpu"
self.conf_path = conf_path
self.model_path = model_path
self.trained = False
# To prevent CUDNN_STATUS_NOT_INITIALIZED error in case of incompatible GPU
try:
self.load_model(model_path, conf_path, spec_path)
except:
self.device = "cpu"
self.load_model(model_path, conf_path, spec_path)
[docs] def load_conf(self, path, spec):
"""
Load .ini conf at <path>
:param path: path to .ini configuration file
:type path: str
:param spec: path to .cfg configuration spec file
:type spec: str
:returns: dict of parameters
:rtype: dict
"""
configspec = ConfigObj(
spec, interpolation=True, list_values=False, _inspec=True
)
conf = ConfigObj(path, unrepr=True, configspec=configspec)
return dict(conf)
[docs] def validate_conf(self, conf):
"""
Ensure all relevant parameters for feature extraction
are present in <conf>
:param path: dict of parameters
:type path: dict
:returns: True/False, are relevant parameters present
:rtype: bool
"""
for param in [
"n_bins",
"length_ngram",
"n_bases",
"dropout",
"sr",
"bins_per_oct",
"fmin",
"hop_length",
]:
if param not in conf:
raise ValueError(f"{param} not present in conf at <self.conf_path>")
if not isinstance(conf["n_bins"], int):
raise ValueError("n_bins in conf at <conf_path> should be an integer")
if not isinstance(conf["length_ngram"], int):
raise ValueError("length_ngram in conf at <conf_path> should be an integer")
if not isinstance(conf["n_bases"], int):
raise ValueError("n_bases in conf at <conf_path> should be an integer")
if not isinstance(conf["dropout"], float):
raise ValueError("dropout in conf at <conf_path> should be a float")
if not isinstance(conf["sr"], int):
raise ValueError("sr in conf at <conf_path> should be an integer")
if not isinstance(conf["bins_per_oct"], int):
raise ValueError("bins_per_oct in conf at <conf_path> should be an integer")
if not isinstance(conf["fmin"], (float, int)):
raise ValueError("fmin in conf at <conf_path> should be an float/integer")
if not isinstance(conf["hop_length"], int):
raise ValueError("hop_length in conf at <conf_path> should be an integer")
def _build_model(self):
"""
Build de CAE model.
:returns: loaded model
:rtype: torch.nn.Module
"""
in_size = self.n_bins * self.length_ngram
return Complex(in_size, self.n_bases, dropout=self.dropout).to(self.device)
[docs] def load_model(self, model_path, conf_path, spec_path):
"""
Load model at <model_path>. Expects model parameters to correspond
to those found in self.params (loaded from self.conf_path).
:param model_path: path to model
:type model_path: str
"""
if not os.path.exists(model_path):
self.download_model(model_path)
print(conf_path, spec_path)
self.params = self.load_conf(conf_path, spec_path)
self.validate_conf(self.params)
for tp, v in self.params.items():
# unpack parameters to class attributes
setattr(self, tp, v)
self.model = self._build_model()
self.model.load_state_dict(torch.load(model_path), strict=False)
self.trained = True
[docs] def download_model(self, model_path=None):
"""Download pre-trained model."""
url = "https://drive.google.com/uc?id=1WQVgqC4Bu4QQJyfKiP89HqJ2RxHAUmJM&export=download"
unzip_path = (
os.sep + os.path.join(*model_path.split(os.sep)[:-2])
if model_path is not None
else os.path.join(WORKDIR, "models", "melody", "caecarnatic")
)
if not os.path.exists(unzip_path):
os.makedirs(unzip_path)
output = os.path.join(unzip_path, "caecarnatic.zip")
gdown.download(url, output, quiet=False)
# Unzip file
with zipfile.ZipFile(output, "r") as zip_ref:
zip_ref.extractall(unzip_path)
# Delete zip file after extraction
os.remove(output)
logger.warning("Files downloaded and extracted successfully.")
[docs] def get_cqt(self, file_path, sr=None):
"""
Extract CQT representation from audio at <file_path> according
to parameters specified in conf at self.conf_path
:param file_path: path to audio
:type file_path: str
:param sr: sampling rate of audio at <file_path>, if None, use self.sr
:type sr: int
:returns: cqt representation
:rtype: np.ndarray
"""
sr = sr if sr else self.sr
repres = to_cqt_repr(
file_path,
self.n_bins,
self.bins_per_oct,
self.fmin,
self.hop_length,
use_nr_samples=-1,
sr=sr,
standard=True,
mult=1.0,
)
return repres.transpose()
[docs] def to_amp_phase(self, cqt):
"""
Extract amplitude and phase vector from model
on <cqt> representation
:param cqt: CQT representation of audio
:type cqt: np.ndarray
:returns: amplitude vector, phases vector
:rtype: np.ndarray, np.ndarray
"""
self.model.to(self.device)
self.model.eval()
ngrams = []
for i in range(0, len(cqt) - self.length_ngram, 1):
curr_ngram = cqt[i : i + self.length_ngram].reshape((-1,))
curr_ngram = standardize(curr_ngram)
ngrams.append(curr_ngram)
x = cuda_variable(torch.FloatTensor(np.vstack(ngrams)))
ampl, phase = self.model(x)
return ampl, phase