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2019-02-01 02:40:20 +11:00
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276
exps-rnn/acc_rnn_search.py
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import os, gc, sys, math, time, glob, random, argparse
import numpy as np
from copy import deepcopy
import torch
import torch.nn as nn
import torch.nn.functional as F
import torchvision.datasets as dset
import torch.backends.cudnn as cudnn
import torchvision.transforms as transforms
from pathlib import Path
lib_dir = (Path(__file__).parent / '..' / '..' / 'lib').resolve()
if str(lib_dir) not in sys.path: sys.path.insert(0, str(lib_dir))
from utils import AverageMeter, time_string, convert_secs2time
from utils import print_log, obtain_accuracy
from utils import count_parameters_in_MB
from datasets import Corpus
from nas_rnn import batchify, get_batch, repackage_hidden
from nas_rnn import DARTSCellSearch, RNNModelSearch
from train_rnn_utils import main_procedure
from scheduler import load_config
parser = argparse.ArgumentParser("RNN")
parser.add_argument('--data_path', type=str, help='Path to dataset')
parser.add_argument('--emsize', type=int, default=300, help='size of word embeddings')
parser.add_argument('--nhid', type=int, default=300, help='number of hidden units per layer')
parser.add_argument('--nhidlast', type=int, default=300, help='number of hidden units for the last rnn layer')
parser.add_argument('--clip', type=float, default=0.25, help='gradient clipping')
parser.add_argument('--epochs', type=int, default=50, help='num of training epochs')
parser.add_argument('--batch_size', type=int, default=256, help='the batch size')
parser.add_argument('--eval_batch_size', type=int, default=10, help='the evaluation batch size')
parser.add_argument('--bptt', type=int, default=35, help='the sequence length')
# DropOut
parser.add_argument('--dropout', type=float, default=0.75, help='dropout applied to layers (0 = no dropout)')
parser.add_argument('--dropouth', type=float, default=0.25, help='dropout for hidden nodes in rnn layers (0 = no dropout)')
parser.add_argument('--dropoutx', type=float, default=0.75, help='dropout for input nodes in rnn layers (0 = no dropout)')
parser.add_argument('--dropouti', type=float, default=0.2, help='dropout for input embedding layers (0 = no dropout)')
parser.add_argument('--dropoute', type=float, default=0, help='dropout to remove words from embedding layer (0 = no dropout)')
# Regularization
parser.add_argument('--lr', type=float, default=20, help='initial learning rate')
parser.add_argument('--alpha', type=float, default=0, help='alpha L2 regularization on RNN activation (alpha = 0 means no regularization)')
parser.add_argument('--beta', type=float, default=1e-3, help='beta slowness regularization applied on RNN activiation (beta = 0 means no regularization)')
parser.add_argument('--wdecay', type=float, default=5e-7, help='weight decay applied to all weights')
# architecture leraning rate
parser.add_argument('--arch_lr', type=float, default=3e-3, help='learning rate for arch encoding')
parser.add_argument('--arch_wdecay', type=float, default=1e-3, help='weight decay for arch encoding')
parser.add_argument('--config_path', type=str, help='the training configure for the discovered model')
# acceleration
parser.add_argument('--tau_max', type=float, help='initial tau')
parser.add_argument('--tau_min', type=float, help='minimum tau')
# log
parser.add_argument('--save_path', type=str, help='Folder to save checkpoints and log.')
parser.add_argument('--print_freq', type=int, help='print frequency (default: 200)')
parser.add_argument('--manualSeed', type=int, help='manual seed')
args = parser.parse_args()
assert torch.cuda.is_available(), 'torch.cuda is not available'
if args.manualSeed is None:
args.manualSeed = random.randint(1, 10000)
if args.nhidlast < 0:
args.nhidlast = args.emsize
random.seed(args.manualSeed)
cudnn.benchmark = True
cudnn.enabled = True
torch.manual_seed(args.manualSeed)
torch.cuda.manual_seed_all(args.manualSeed)
def main():
# Init logger
args.save_path = os.path.join(args.save_path, 'seed-{:}'.format(args.manualSeed))
if not os.path.isdir(args.save_path):
os.makedirs(args.save_path)
log = open(os.path.join(args.save_path, 'log-seed-{:}.txt'.format(args.manualSeed)), 'w')
print_log('save path : {}'.format(args.save_path), log)
state = {k: v for k, v in args._get_kwargs()}
print_log(state, log)
print_log("Random Seed: {}".format(args.manualSeed), log)
print_log("Python version : {}".format(sys.version.replace('\n', ' ')), log)
print_log("Torch version : {}".format(torch.__version__), log)
print_log("CUDA version : {}".format(torch.version.cuda), log)
print_log("cuDNN version : {}".format(cudnn.version()), log)
print_log("Num of GPUs : {}".format(torch.cuda.device_count()), log)
# Dataset
corpus = Corpus(args.data_path)
train_data = batchify(corpus.train, args.batch_size, True)
search_data = batchify(corpus.valid, args.batch_size, True)
valid_data = batchify(corpus.valid, args.eval_batch_size, True)
print_log("Train--Data Size : {:}".format(train_data.size()), log)
print_log("Search-Data Size : {:}".format(search_data.size()), log)
print_log("Valid--Data Size : {:}".format(valid_data.size()), log)
ntokens = len(corpus.dictionary)
model = RNNModelSearch(ntokens, args.emsize, args.nhid, args.nhidlast,
args.dropout, args.dropouth, args.dropoutx, args.dropouti, args.dropoute,
DARTSCellSearch, None)
model = model.cuda()
print_log('model ==>> : {:}'.format(model), log)
print_log('Parameter size : {:} MB'.format(count_parameters_in_MB(model)), log)
base_optimizer = torch.optim.SGD(model.base_parameters(), lr=args.lr, weight_decay=args.wdecay)
arch_optimizer = torch.optim.Adam(model.arch_parameters(), lr=args.arch_lr, weight_decay=args.arch_wdecay)
config = load_config(args.config_path)
print_log('Load config from {:} ==>>\n {:}'.format(args.config_path, config), log)
# snapshot
checkpoint_path = os.path.join(args.save_path, 'checkpoint-search.pth')
if os.path.isfile(checkpoint_path):
checkpoint = torch.load(checkpoint_path)
start_epoch = checkpoint['epoch']
model.load_state_dict( checkpoint['state_dict'] )
base_optimizer.load_state_dict( checkpoint['base_optimizer'] )
arch_optimizer.load_state_dict( checkpoint['arch_optimizer'] )
genotypes = checkpoint['genotypes']
valid_losses = checkpoint['valid_losses']
print_log('Load checkpoint from {:} with start-epoch = {:}'.format(checkpoint_path, start_epoch), log)
else:
start_epoch, genotypes, valid_losses = 0, {}, {-1:1e8}
print_log('Train model-search from scratch.', log)
model.set_gumbel(True, False)
# Main loop
start_time, epoch_time, total_train_time = time.time(), AverageMeter(), 0
for epoch in range(start_epoch, args.epochs):
model.set_tau( args.tau_max - epoch*1.0/args.epochs*(args.tau_max-args.tau_min) )
need_time = convert_secs2time(epoch_time.val * (args.epochs-epoch), True)
print_log('\n==>>{:s} [Epoch={:03d}/{:03d}] {:s} || tau={:}'.format(time_string(), epoch, args.epochs, need_time, model.get_tau()), log)
# training
data_time, train_time = train(model, base_optimizer, arch_optimizer, corpus, train_data, search_data, epoch, log)
total_train_time += train_time
# evaluation
# validation
valid_loss = infer(model, corpus, valid_data, args.eval_batch_size)
# save genotype
if valid_loss < min( valid_losses.values() ): is_best = True
else : is_best = False
print_log('-'*10 + ' [Epoch={:03d}/{:03d}] : is-best={:}, validation-loss={:}, validation-PPL={:}'.format(epoch, args.epochs, is_best, valid_loss, math.exp(valid_loss)), log)
print_log('{:}'.format(F.softmax(model.arch_weights, dim=-1)), log)
print_log('genotype : {:}'.format(model.genotype()), log)
valid_losses[epoch] = valid_loss
genotypes[epoch] = model.genotype()
print_log(' the {:}-th genotype = {:}'.format(epoch, genotypes[epoch]), log)
# save checkpoint
if is_best:
genotypes['best'] = model.genotype()
torch.save({'epoch' : epoch + 1,
'args' : deepcopy(args),
'state_dict': model.state_dict(),
'genotypes' : genotypes,
'valid_losses' : valid_losses,
'base_optimizer' : base_optimizer.state_dict(),
'arch_optimizer' : arch_optimizer.state_dict()},
checkpoint_path)
print_log('----> Save into {:}'.format(checkpoint_path), log)
# measure elapsed time
epoch_time.update(time.time() - start_time)
start_time = time.time()
print_log('Finish with training time = {:}'.format( convert_secs2time(total_train_time, True) ), log)
# clear GPU cache
torch.cuda.empty_cache()
main_procedure(config, genotypes['best'], args.save_path, args.print_freq, log)
log.close()
def train(model, base_optimizer, arch_optimizer, corpus, train_data, search_data, epoch, log):
data_time, batch_time = AverageMeter(), AverageMeter()
# Turn on training mode which enables dropout.
total_loss = 0
start_time = time.time()
ntokens = len(corpus.dictionary)
hidden_train, hidden_valid = model.init_hidden(args.batch_size), model.init_hidden(args.batch_size)
batch, i = 0, 0
while i < train_data.size(0) - 1 - 1:
seq_len = int( args.bptt if np.random.random() < 0.95 else args.bptt / 2. )
# Prevent excessively small or negative sequence lengths
# seq_len = max(5, int(np.random.normal(bptt, 5)))
# # There's a very small chance that it could select a very long sequence length resulting in OOM
# seq_len = min(seq_len, args.bptt + args.max_seq_len_delta)
for param_group in base_optimizer.param_groups:
param_group['lr'] *= float( seq_len / args.bptt )
model.train()
data_valid, targets_valid = get_batch(search_data, i % (search_data.size(0) - 1), args.bptt)
data_train, targets_train = get_batch(train_data , i, seq_len)
hidden_train = repackage_hidden(hidden_train)
hidden_valid = repackage_hidden(hidden_valid)
data_time.update(time.time() - start_time)
# validation loss
targets_valid = targets_valid.contiguous().view(-1)
arch_optimizer.step()
log_prob, hidden_valid = model(data_valid, hidden_valid, return_h=False)
arch_loss = nn.functional.nll_loss(log_prob.view(-1, log_prob.size(2)), targets_valid)
arch_loss.backward()
arch_optimizer.step()
# model update
base_optimizer.zero_grad()
targets_train = targets_train.contiguous().view(-1)
log_prob, hidden_train, rnn_hs, dropped_rnn_hs = model(data_train, hidden_train, return_h=True)
raw_loss = nn.functional.nll_loss(log_prob.view(-1, log_prob.size(2)), targets_train)
loss = raw_loss
# Activiation Regularization
if args.alpha > 0:
loss = loss + sum(args.alpha * dropped_rnn_h.pow(2).mean() for dropped_rnn_h in dropped_rnn_hs[-1:])
# Temporal Activation Regularization (slowness)
loss = loss + sum(args.beta * (rnn_h[1:] - rnn_h[:-1]).pow(2).mean() for rnn_h in rnn_hs[-1:])
loss.backward()
# `clip_grad_norm` helps prevent the exploding gradient problem in RNNs.
nn.utils.clip_grad_norm_(model.base_parameters(), args.clip)
base_optimizer.step()
for param_group in base_optimizer.param_groups:
param_group['lr'] /= float( seq_len / args.bptt )
total_loss += raw_loss.item()
gc.collect()
batch_time.update(time.time() - start_time)
start_time = time.time()
batch, i = batch + 1, i + seq_len
if batch % args.print_freq == 0 or i >= train_data.size(0) - 1 - 1:
print_log(' || Epoch: {:03d} :: {:03d}/{:03d} '.format(epoch, batch, len(train_data) // args.bptt), log)
#print_log(' || Epoch: {:03d} :: {:03d}/{:03d} = {:}'.format(epoch, batch, len(train_data) // args.bptt, model.genotype()), log)
cur_loss = total_loss / args.print_freq
print_log(' [TRAIN] Time : data {:.3f} ({:.3f}) batch {:.3f} ({:.3f}) Loss : {:}, PPL : {:}'.format(data_time.val, data_time.avg, batch_time.val, batch_time.avg, cur_loss, math.exp(cur_loss)), log)
#print(F.softmax(model.arch_weights, dim=-1))
total_loss = 0
return data_time.sum, batch_time.sum
def infer(model, corpus, data_source, batch_size):
model.eval()
with torch.no_grad():
total_loss = 0
ntokens = len(corpus.dictionary)
hidden = model.init_hidden(batch_size)
for i in range(0, data_source.size(0) - 1, args.bptt):
data, targets = get_batch(data_source, i, args.bptt)
targets = targets.view(-1)
log_prob, hidden = model(data, hidden)
loss = nn.functional.nll_loss(log_prob.view(-1, log_prob.size(2)), targets)
total_loss += loss.item() * len(data)
hidden = repackage_hidden(hidden)
return total_loss / len(data_source)
if __name__ == '__main__':
main()

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exps-rnn/debug_test.py
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import os, gc, sys, time, math
import numpy as np
from copy import deepcopy
import torch
import torch.nn as nn
from pathlib import Path
lib_dir = (Path(__file__).parent / '..' / '..' / 'lib').resolve()
if str(lib_dir) not in sys.path: sys.path.insert(0, str(lib_dir))
from utils import print_log, obtain_accuracy, AverageMeter
from utils import time_string, convert_secs2time
from utils import count_parameters_in_MB
from datasets import Corpus
from nas_rnn import batchify, get_batch, repackage_hidden
from nas_rnn import DARTS
from nas_rnn import DARTSCell, RNNModel
from nas_rnn import basemodel as model
from scheduler import load_config
def main_procedure(config, genotype, print_freq, log):
print_log('-'*90, log)
print_log('genotype : {:}'.format(genotype), log)
print_log('config : {:}'.format(config.bptt), log)
corpus = Corpus(config.data_path)
train_data = batchify(corpus.train, config.train_batch, True)
valid_data = batchify(corpus.valid, config.eval_batch , True)
test_data = batchify(corpus.test, config.test_batch , True)
ntokens = len(corpus.dictionary)
print_log("Train--Data Size : {:}".format(train_data.size()), log)
print_log("Valid--Data Size : {:}".format(valid_data.size()), log)
print_log("Test---Data Size : {:}".format( test_data.size()), log)
print_log("ntokens = {:}".format(ntokens), log)
model = RNNModel(ntokens, config.emsize, config.nhid, config.nhidlast,
config.dropout, config.dropouth, config.dropoutx, config.dropouti, config.dropoute,
cell_cls=DARTSCell, genotype=genotype)
model = model.cuda()
print_log('Network =>\n{:}'.format(model), log)
print_log('Genotype : {:}'.format(genotype), log)
print_log('Parameters : {:.3f} MB'.format(count_parameters_in_MB(model)), log)
print_log('--------------------- Finish Training ----------------', log)
test_loss = evaluate(model, corpus, test_data , config.test_batch, config.bptt)
print_log('| End of training | test loss {:5.2f} | test ppl {:8.2f}'.format(test_loss, math.exp(test_loss)), log)
vali_loss = evaluate(model, corpus, valid_data, config.eval_batch, config.bptt)
print_log('| End of training | valid loss {:5.2f} | valid ppl {:8.2f}'.format(vali_loss, math.exp(vali_loss)), log)
def evaluate(model, corpus, data_source, batch_size, bptt):
# Turn on evaluation mode which disables dropout.
model.eval()
total_loss, total_length = 0.0, 0.0
with torch.no_grad():
ntokens = len(corpus.dictionary)
hidden = model.init_hidden(batch_size)
for i in range(0, data_source.size(0) - 1, bptt):
data, targets = get_batch(data_source, i, bptt)
targets = targets.view(-1)
log_prob, hidden = model(data, hidden)
loss = nn.functional.nll_loss(log_prob.view(-1, log_prob.size(2)), targets)
total_loss += loss.item() * len(data)
total_length += len(data)
hidden = repackage_hidden(hidden)
return total_loss / total_length
if __name__ == '__main__':
path = './configs/NAS-PTB-BASE.config'
config = load_config(path)
main_procedure(config, DARTS, 10, None)

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exps-rnn/train_rnn_search.py
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import os, gc, sys, math, time, glob, random, argparse
import numpy as np
from copy import deepcopy
import torch
import torch.nn as nn
import torch.nn.functional as F
import torchvision.datasets as dset
import torch.backends.cudnn as cudnn
import torchvision.transforms as transforms
from pathlib import Path
lib_dir = (Path(__file__).parent / '..' / '..' / 'lib').resolve()
if str(lib_dir) not in sys.path: sys.path.insert(0, str(lib_dir))
from utils import AverageMeter, time_string, convert_secs2time
from utils import print_log, obtain_accuracy
from utils import count_parameters_in_MB
from datasets import Corpus
from nas_rnn import batchify, get_batch, repackage_hidden
from nas_rnn import DARTSCellSearch, RNNModelSearch
from train_rnn_utils import main_procedure
from scheduler import load_config
parser = argparse.ArgumentParser("RNN")
parser.add_argument('--data_path', type=str, help='Path to dataset')
parser.add_argument('--emsize', type=int, default=300, help='size of word embeddings')
parser.add_argument('--nhid', type=int, default=300, help='number of hidden units per layer')
parser.add_argument('--nhidlast', type=int, default=300, help='number of hidden units for the last rnn layer')
parser.add_argument('--clip', type=float, default=0.25, help='gradient clipping')
parser.add_argument('--epochs', type=int, default=50, help='num of training epochs')
parser.add_argument('--batch_size', type=int, default=256, help='the batch size')
parser.add_argument('--eval_batch_size', type=int, default=10, help='the evaluation batch size')
parser.add_argument('--bptt', type=int, default=35, help='the sequence length')
# DropOut
parser.add_argument('--dropout', type=float, default=0.75, help='dropout applied to layers (0 = no dropout)')
parser.add_argument('--dropouth', type=float, default=0.25, help='dropout for hidden nodes in rnn layers (0 = no dropout)')
parser.add_argument('--dropoutx', type=float, default=0.75, help='dropout for input nodes in rnn layers (0 = no dropout)')
parser.add_argument('--dropouti', type=float, default=0.2, help='dropout for input embedding layers (0 = no dropout)')
parser.add_argument('--dropoute', type=float, default=0, help='dropout to remove words from embedding layer (0 = no dropout)')
# Regularization
parser.add_argument('--lr', type=float, default=20, help='initial learning rate')
parser.add_argument('--alpha', type=float, default=0, help='alpha L2 regularization on RNN activation (alpha = 0 means no regularization)')
parser.add_argument('--beta', type=float, default=1e-3, help='beta slowness regularization applied on RNN activiation (beta = 0 means no regularization)')
parser.add_argument('--wdecay', type=float, default=5e-7, help='weight decay applied to all weights')
# architecture leraning rate
parser.add_argument('--arch_lr', type=float, default=3e-3, help='learning rate for arch encoding')
parser.add_argument('--arch_wdecay', type=float, default=1e-3, help='weight decay for arch encoding')
parser.add_argument('--config_path', type=str, help='the training configure for the discovered model')
# log
parser.add_argument('--save_path', type=str, help='Folder to save checkpoints and log.')
parser.add_argument('--print_freq', type=int, help='print frequency (default: 200)')
parser.add_argument('--manualSeed', type=int, help='manual seed')
args = parser.parse_args()
assert torch.cuda.is_available(), 'torch.cuda is not available'
if args.manualSeed is None:
args.manualSeed = random.randint(1, 10000)
if args.nhidlast < 0:
args.nhidlast = args.emsize
random.seed(args.manualSeed)
cudnn.benchmark = True
cudnn.enabled = True
torch.manual_seed(args.manualSeed)
torch.cuda.manual_seed_all(args.manualSeed)
def main():
# Init logger
args.save_path = os.path.join(args.save_path, 'seed-{:}'.format(args.manualSeed))
if not os.path.isdir(args.save_path):
os.makedirs(args.save_path)
log = open(os.path.join(args.save_path, 'log-seed-{:}.txt'.format(args.manualSeed)), 'w')
print_log('save path : {}'.format(args.save_path), log)
state = {k: v for k, v in args._get_kwargs()}
print_log(state, log)
print_log("Random Seed: {}".format(args.manualSeed), log)
print_log("Python version : {}".format(sys.version.replace('\n', ' ')), log)
print_log("Torch version : {}".format(torch.__version__), log)
print_log("CUDA version : {}".format(torch.version.cuda), log)
print_log("cuDNN version : {}".format(cudnn.version()), log)
print_log("Num of GPUs : {}".format(torch.cuda.device_count()), log)
# Dataset
corpus = Corpus(args.data_path)
train_data = batchify(corpus.train, args.batch_size, True)
search_data = batchify(corpus.valid, args.batch_size, True)
valid_data = batchify(corpus.valid, args.eval_batch_size, True)
print_log("Train--Data Size : {:}".format(train_data.size()), log)
print_log("Search-Data Size : {:}".format(search_data.size()), log)
print_log("Valid--Data Size : {:}".format(valid_data.size()), log)
ntokens = len(corpus.dictionary)
model = RNNModelSearch(ntokens, args.emsize, args.nhid, args.nhidlast,
args.dropout, args.dropouth, args.dropoutx, args.dropouti, args.dropoute,
DARTSCellSearch, None)
model = model.cuda()
print_log('model ==>> : {:}'.format(model), log)
print_log('Parameter size : {:} MB'.format(count_parameters_in_MB(model)), log)
base_optimizer = torch.optim.SGD(model.base_parameters(), lr=args.lr, weight_decay=args.wdecay)
arch_optimizer = torch.optim.Adam(model.arch_parameters(), lr=args.arch_lr, weight_decay=args.arch_wdecay)
config = load_config(args.config_path)
print_log('Load config from {:} ==>>\n {:}'.format(args.config_path, config), log)
# snapshot
checkpoint_path = os.path.join(args.save_path, 'checkpoint-search.pth')
if os.path.isfile(checkpoint_path):
checkpoint = torch.load(checkpoint_path)
start_epoch = checkpoint['epoch']
model.load_state_dict( checkpoint['state_dict'] )
base_optimizer.load_state_dict( checkpoint['base_optimizer'] )
arch_optimizer.load_state_dict( checkpoint['arch_optimizer'] )
genotypes = checkpoint['genotypes']
valid_losses = checkpoint['valid_losses']
print_log('Load checkpoint from {:} with start-epoch = {:}'.format(checkpoint_path, start_epoch), log)
else:
start_epoch, genotypes, valid_losses = 0, {}, {-1:1e8}
print_log('Train model-search from scratch.', log)
# Main loop
start_time, epoch_time, total_train_time = time.time(), AverageMeter(), 0
for epoch in range(start_epoch, args.epochs):
need_time = convert_secs2time(epoch_time.val * (args.epochs-epoch), True)
print_log('\n==>>{:s} [Epoch={:03d}/{:03d}] {:s}'.format(time_string(), epoch, args.epochs, need_time), log)
# training
data_time, train_time = train(model, base_optimizer, arch_optimizer, corpus, train_data, search_data, epoch, log)
total_train_time += train_time
# evaluation
# validation
valid_loss = infer(model, corpus, valid_data, args.eval_batch_size)
# save genotype
if valid_loss < min( valid_losses.values() ): is_best = True
else : is_best = False
print_log('-'*10 + ' [Epoch={:03d}/{:03d}] : is-best={:}, validation-loss={:}, validation-PPL={:}'.format(epoch, args.epochs, is_best, valid_loss, math.exp(valid_loss)), log)
valid_losses[epoch] = valid_loss
genotypes[epoch] = model.genotype()
print_log(' the {:}-th genotype = {:}'.format(epoch, genotypes[epoch]), log)
# save checkpoint
if is_best:
genotypes['best'] = model.genotype()
torch.save({'epoch' : epoch + 1,
'args' : deepcopy(args),
'state_dict': model.state_dict(),
'genotypes' : genotypes,
'valid_losses' : valid_losses,
'base_optimizer' : base_optimizer.state_dict(),
'arch_optimizer' : arch_optimizer.state_dict()},
checkpoint_path)
print_log('----> Save into {:}'.format(checkpoint_path), log)
# measure elapsed time
epoch_time.update(time.time() - start_time)
start_time = time.time()
print_log('Finish with training time = {:}'.format( convert_secs2time(total_train_time, True) ), log)
# clear GPU cache
torch.cuda.empty_cache()
main_procedure(config, genotypes['best'], args.save_path, args.print_freq, log)
log.close()
def train(model, base_optimizer, arch_optimizer, corpus, train_data, search_data, epoch, log):
data_time, batch_time = AverageMeter(), AverageMeter()
# Turn on training mode which enables dropout.
total_loss = 0
start_time = time.time()
ntokens = len(corpus.dictionary)
hidden_train, hidden_valid = model.init_hidden(args.batch_size), model.init_hidden(args.batch_size)
batch, i = 0, 0
while i < train_data.size(0) - 1 - 1:
seq_len = int( args.bptt if np.random.random() < 0.95 else args.bptt / 2. )
# Prevent excessively small or negative sequence lengths
# seq_len = max(5, int(np.random.normal(bptt, 5)))
# # There's a very small chance that it could select a very long sequence length resulting in OOM
# seq_len = min(seq_len, args.bptt + args.max_seq_len_delta)
for param_group in base_optimizer.param_groups:
param_group['lr'] *= float( seq_len / args.bptt )
model.train()
data_valid, targets_valid = get_batch(search_data, i % (search_data.size(0) - 1), args.bptt)
data_train, targets_train = get_batch(train_data , i, seq_len)
hidden_train = repackage_hidden(hidden_train)
hidden_valid = repackage_hidden(hidden_valid)
data_time.update(time.time() - start_time)
# validation loss
targets_valid = targets_valid.contiguous().view(-1)
arch_optimizer.step()
log_prob, hidden_valid = model(data_valid, hidden_valid, return_h=False)
arch_loss = nn.functional.nll_loss(log_prob.view(-1, log_prob.size(2)), targets_valid)
arch_loss.backward()
arch_optimizer.step()
# model update
base_optimizer.zero_grad()
targets_train = targets_train.contiguous().view(-1)
log_prob, hidden_train, rnn_hs, dropped_rnn_hs = model(data_train, hidden_train, return_h=True)
raw_loss = nn.functional.nll_loss(log_prob.view(-1, log_prob.size(2)), targets_train)
loss = raw_loss
# Activiation Regularization
if args.alpha > 0:
loss = loss + sum(args.alpha * dropped_rnn_h.pow(2).mean() for dropped_rnn_h in dropped_rnn_hs[-1:])
# Temporal Activation Regularization (slowness)
loss = loss + sum(args.beta * (rnn_h[1:] - rnn_h[:-1]).pow(2).mean() for rnn_h in rnn_hs[-1:])
loss.backward()
# `clip_grad_norm` helps prevent the exploding gradient problem in RNNs.
nn.utils.clip_grad_norm_(model.base_parameters(), args.clip)
base_optimizer.step()
for param_group in base_optimizer.param_groups:
param_group['lr'] /= float( seq_len / args.bptt )
total_loss += raw_loss.item()
gc.collect()
batch_time.update(time.time() - start_time)
start_time = time.time()
batch, i = batch + 1, i + seq_len
if batch % args.print_freq == 0 or i >= train_data.size(0) - 1 - 1:
print_log(' || Epoch: {:03d} :: {:03d}/{:03d}'.format(epoch, batch, len(train_data) // args.bptt), log)
#print_log(' || Epoch: {:03d} :: {:03d}/{:03d} = {:}'.format(epoch, batch, len(train_data) // args.bptt, model.genotype()), log)
cur_loss = total_loss / args.print_freq
print_log(' ---> Time : data {:.3f} ({:.3f}) batch {:.3f} ({:.3f}) Loss : {:}, PPL : {:}'.format(data_time.val, data_time.avg, batch_time.val, batch_time.avg, cur_loss, math.exp(cur_loss)), log)
print(F.softmax(model.arch_weights, dim=-1))
total_loss = 0
return data_time.sum, batch_time.sum
def infer(model, corpus, data_source, batch_size):
model.eval()
with torch.no_grad():
total_loss, total_length = 0, 0
ntokens = len(corpus.dictionary)
hidden = model.init_hidden(batch_size)
for i in range(0, data_source.size(0) - 1, args.bptt):
data, targets = get_batch(data_source, i, args.bptt)
targets = targets.view(-1)
log_prob, hidden = model(data, hidden)
loss = nn.functional.nll_loss(log_prob.view(-1, log_prob.size(2)), targets)
total_loss += loss.item() * len(data)
total_length += len(data)
hidden = repackage_hidden(hidden)
return total_loss / total_length
if __name__ == '__main__':
main()