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utils.py
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utils.py
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import torch
import numpy as np
import random
import logging
import argparse
from contextlib import contextmanager
import os
import json
from pathlib import Path
import sys
import warnings
def set_seed(seed, cudnn_enabled=True):
"""for reproducibility
:param seed:
:return:
"""
np.random.seed(seed)
random.seed(seed)
torch.manual_seed(seed)
if torch.cuda.is_available():
torch.cuda.manual_seed(seed)
torch.cuda.manual_seed_all(seed)
torch.backends.cudnn.enabled = cudnn_enabled
torch.backends.cudnn.benchmark = False
torch.backends.cudnn.deterministic = True
def set_logger():
logging.basicConfig(
format='%(asctime)s - %(name)s - %(levelname)s - %(message)s',
level=logging.INFO
)
def get_device(cuda=True, gpus='0'):
return torch.device("cuda:" + gpus if torch.cuda.is_available() and cuda else "cpu")
def detach_to_numpy(tensor):
return tensor.detach().cpu().numpy()
def str2bool(v):
if isinstance(v, bool):
return v
if v.lower() in ('yes', 'true', 't', 'y', '1'):
return True
elif v.lower() in ('no', 'false', 'f', 'n', '0'):
return False
else:
raise argparse.ArgumentTypeError('Boolean value expected.')
def take(X, Y, classes):
indices = np.isin(Y, classes)
return X[indices], Y[indices]
def pytorch_take(X, Y, classes):
indices = torch.stack([y_ == Y for y_ in classes]).sum(0).bool()
return X[indices], Y[indices]
def pytorch_take2(X, Y, X_idx, classes):
indices = torch.stack([y_ == Y for y_ in classes]).sum(0).bool()
return X[indices], Y[indices], X_idx[indices]
def lbls1_to_lbls2(Y, l2l):
for (lbls1_class, lbls2_class) in l2l.items():
if isinstance(lbls2_class, list):
for c in lbls2_class:
Y[Y == lbls1_class] = c + 1000
elif isinstance(lbls2_class, int):
Y[Y == lbls1_class] = lbls2_class + 1000
else:
raise NotImplementedError("not a valid type")
return Y - 1000
@contextmanager
def suppress_stdout():
with open(os.devnull, "w") as devnull:
old_stdout = sys.stdout
old_stderr = sys.stderr
sys.stdout = devnull
sys.stderr = devnull
try:
yield
finally:
sys.stdout = old_stdout
sys.stderr = old_stderr
# create folders for saving models and logs
def _init_(out_path, exp_name):
script_path = os.path.dirname(__file__)
script_path = '.' if script_path == '' else script_path
if not os.path.exists(out_path + '/' + exp_name):
os.makedirs(out_path + '/' + exp_name)
# save configurations
os.system('cp -r ' + script_path + '/*.py ' + out_path + '/' + exp_name)
def get_art_dir(args):
art_dir = Path(args.out_dir)
art_dir.mkdir(exist_ok=True, parents=True)
curr = 0
existing = [
int(x.as_posix().split('_')[-1])
for x in art_dir.iterdir() if x.is_dir()
]
if len(existing) > 0:
curr = max(existing) + 1
out_dir = art_dir / f"version_{curr}"
out_dir.mkdir()
return out_dir
def save_experiment(args, results, return_out_dir=False, save_results=True):
out_dir = get_art_dir(args)
json.dump(
vars(args),
open(out_dir / "meta.experiment", "w")
)
# loss curve
if save_results:
json.dump(results, open(out_dir / "results.experiment", "w"))
if return_out_dir:
return out_dir
def topk(true, pred, k):
max_pred = np.argsort(pred, axis=1)[:, -k:] # take top k
two_d_true = np.expand_dims(true, 1) # 1d -> 2d
two_d_true = np.repeat(two_d_true, k, axis=1) # repeat along second axis
return (two_d_true == max_pred).sum()/true.shape[0]
def to_one_hot(y, dtype=torch.double):
# convert a single label into a one-hot vector
y_output_onehot = torch.zeros((y.shape[0], y.max().type(torch.IntTensor) + 1), dtype=dtype, device=y.device)
return y_output_onehot.scatter_(1, y.unsqueeze(1), 1)
def CE_loss(y, y_hat, num_classes):
# convert a single label into a one-hot vector
y_output_onehot = torch.zeros((y.shape[0], num_classes), dtype=y_hat.dtype, device=y.device)
y_output_onehot.scatter_(1, y.unsqueeze(1), 1)
return - torch.sum(y_output_onehot * torch.log(y_hat + 1e-12), dim=1).mean()
def permute_data_lbls(data, labels):
perm = np.random.permutation(data.shape[0])
return data[perm], labels[perm]
def N_vec(y):
"""
Compute the count vector for PG Multinomial inference
:param x:
:return:
"""
if y.dim() == 1:
N = torch.sum(y)
reminder = N - torch.cumsum(y)[:-2]
return torch.cat((torch.tensor([N]).to(y.device), reminder))
elif y.dim() == 2:
N = torch.sum(y, dim=1, keepdim=True)
reminder = N - torch.cumsum(y, dim=1)[:, :-2]
return torch.cat((N, reminder), dim=1)
else:
raise ValueError("x must be 1 or 2D")
def kappa_vec(y):
"""
Compute the kappa vector for PG Multinomial inference
:param x:
:return:
"""
if y.dim() == 1:
return y[:-1] - N_vec(y)/2.0
elif y.dim() == 2:
return y[:, :-1] - N_vec(y)/2.0
else:
raise ValueError("x must be 1 or 2D")
# modified from:
# https://github.com/cornellius-gp/gpytorch/blob/master/gpytorch/utils/cholesky.py
def psd_safe_cholesky(A, upper=False, out=None, jitter=None):
"""Compute the Cholesky decomposition of A. If A is only p.s.d, add a small jitter to the diagonal.
Args:
:attr:`A` (Tensor):
The tensor to compute the Cholesky decomposition of
:attr:`upper` (bool, optional):
See torch.cholesky
:attr:`out` (Tensor, optional):
See torch.cholesky
:attr:`jitter` (float, optional):
The jitter to add to the diagonal of A in case A is only p.s.d. If omitted, chosen
as 1e-6 (float) or 1e-8 (double)
"""
try:
L = torch.cholesky(A, upper=upper, out=out)
return L
except RuntimeError as e:
isnan = torch.isnan(A)
if isnan.any():
raise ValueError(
f"cholesky_cpu: {isnan.sum().item()} of {A.numel()} elements of the {A.shape} tensor are NaN."
)
if jitter is None:
jitter = 1e-6 if A.dtype == torch.float32 else 1e-8
Aprime = A.clone()
jitter_prev = 0
for i in range(5):
jitter_new = jitter * (10 ** i)
Aprime.diagonal(dim1=-2, dim2=-1).add_(jitter_new - jitter_prev)
jitter_prev = jitter_new
try:
L = torch.cholesky(Aprime, upper=upper, out=out)
warnings.warn(
f"A not p.d., added jitter of {jitter_new} to the diagonal",
RuntimeWarning,
)
return L
except RuntimeError:
continue
raise e