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<div class="section">
<h4 id="template-model-definition">Template model definition</h4>
<p>In 99% of cases you want to just copy this template to start a new lightningModule and change the core of what your model is actually trying to do.</p>
<pre><code class="python">import os
from collections import OrderedDict
import torch.nn as nn
from torchvision.datasets import MNIST
import torchvision.transforms as transforms
import torch
import torch.nn.functional as F
from test_tube import HyperOptArgumentParser
from torch import optim
from pytorch_lightning.root_module.root_module import LightningModule
class LightningTemplateModel(LightningModule):
&quot;&quot;&quot;
Sample model to show how to define a template
&quot;&quot;&quot;
def __init__(self, hparams):
&quot;&quot;&quot;
Pass in parsed HyperOptArgumentParser to the model
:param hparams:
&quot;&quot;&quot;
# init superclass
super(LightningTemplateModel, self).__init__(hparams)
self.batch_size = hparams.batch_size
# build model
self.__build_model()
# ---------------------
# MODEL SETUP
# ---------------------
def __build_model(self):
&quot;&quot;&quot;
Layout model
:return:
&quot;&quot;&quot;
self.c_d1 = nn.Linear(in_features=self.hparams.in_features, out_features=self.hparams.hidden_dim)
self.c_d1_bn = nn.BatchNorm1d(self.hparams.hidden_dim)
self.c_d1_drop = nn.Dropout(self.hparams.drop_prob)
self.c_d2 = nn.Linear(in_features=self.hparams.hidden_dim, out_features=self.hparams.out_features)
# ---------------------
# TRAINING
# ---------------------
def forward(self, x):
&quot;&quot;&quot;
No special modification required for lightning, define as you normally would
:param x:
:return:
&quot;&quot;&quot;
x = self.c_d1(x)
x = torch.tanh(x)
x = self.c_d1_bn(x)
x = self.c_d1_drop(x)
x = self.c_d2(x)
logits = F.log_softmax(x, dim=1)
return logits
def loss(self, labels, logits):
nll = F.nll_loss(logits, labels)
return nll
def training_step(self, data_batch, batch_i):
&quot;&quot;&quot;
Lightning calls this inside the training loop
:param data_batch:
:return:
&quot;&quot;&quot;
# forward pass
x, y = data_batch
x = x.view(x.size(0), -1)
y_hat = self.forward(x)
# calculate loss
loss_val = self.loss(y, y_hat)
output = OrderedDict({
'loss': loss_val,
'tqdm_metrics': {}
})
return output
def validation_step(self, data_batch, batch_i):
&quot;&quot;&quot;
Lightning calls this inside the validation loop
:param data_batch:
:return:
&quot;&quot;&quot;
x, y = data_batch
x = x.view(x.size(0), -1)
y_hat = self.forward(x)
loss_val = self.loss(y, y_hat)
# acc
labels_hat = torch.argmax(y_hat, dim=1)
val_acc = torch.sum(y == labels_hat).item() / (len(y) * 1.0)
output = OrderedDict({
'val_loss': loss_val,
'val_acc': torch.tensor(val_acc),
})
return output
def validation_end(self, outputs):
&quot;&quot;&quot;
Called at the end of validation to aggregate outputs
:param outputs: list of individual outputs of each validation step
:return:
&quot;&quot;&quot;
val_loss_mean = 0
val_acc_mean = 0
for output in outputs:
val_loss_mean += output['val_loss']
val_acc_mean += output['val_acc']
val_loss_mean /= len(outputs)
val_acc_mean /= len(outputs)
tqdm_dic = {'val_loss': val_loss_mean.item(), 'val_acc': val_acc_mean.item()}
return tqdm_dic
def update_tng_log_metrics(self, logs):
return logs
# ---------------------
# MODEL SAVING
# ---------------------
def get_save_dict(self):
checkpoint = {'state_dict': self.state_dict()}
return checkpoint
def load_model_specific(self, checkpoint):
self.load_state_dict(checkpoint['state_dict'])
pass
# ---------------------
# TRAINING SETUP
# ---------------------
def configure_optimizers(self):
&quot;&quot;&quot;
return whatever optimizers we want here
:return: list of optimizers
&quot;&quot;&quot;
optimizer = optim.Adam(self.parameters(), lr=self.hparams.learning_rate)
return [optimizer]
def __dataloader(self, train):
# init data generators
transform = transforms.Compose([transforms.ToTensor(), transforms.Normalize((0.5,), (1.0,))])
dataset = MNIST(root=self.hparams.data_root, train=train, transform=transform, download=True)
loader = torch.utils.data.DataLoader(
dataset=dataset,
batch_size=self.hparams.batch_size,
shuffle=True
)
return loader
@property
def tng_dataloader(self):
if self._tng_dataloader is None:
try:
self._tng_dataloader = self.__dataloader(train=True)
except Exception as e:
print(e)
raise e
return self._tng_dataloader
@property
def val_dataloader(self):
if self._val_dataloader is None:
try:
self._val_dataloader = self.__dataloader(train=False)
except Exception as e:
print(e)
raise e
return self._val_dataloader
@property
def test_dataloader(self):
if self._test_dataloader is None:
try:
self._test_dataloader = self.__dataloader(train=False)
except Exception as e:
print(e)
raise e
return self._test_dataloader
@staticmethod
def add_model_specific_args(parent_parser, root_dir):
&quot;&quot;&quot;
Parameters you define here will be available to your model through self.hparams
:param parent_parser:
:param root_dir:
:return:
&quot;&quot;&quot;
parser = HyperOptArgumentParser(strategy=parent_parser.strategy, parents=[parent_parser])
# param overwrites
# parser.set_defaults(gradient_clip=5.0)
# network params
parser.opt_list('--drop_prob', default=0.2, options=[0.2, 0.5], type=float, tunable=False)
parser.add_argument('--in_features', default=28*28)
parser.add_argument('--out_features', default=10)
parser.add_argument('--hidden_dim', default=50000) # use 500 for CPU, 50000 for GPU to see speed difference
# data
parser.add_argument('--data_root', default=os.path.join(root_dir, 'mnist'), type=str)
# training params (opt)
parser.opt_list('--learning_rate', default=0.001, type=float, options=[0.0001, 0.0005, 0.001, 0.005],
tunable=False)
parser.opt_list('--batch_size', default=256, type=int, options=[32, 64, 128, 256], tunable=False)
parser.opt_list('--optimizer_name', default='adam', type=str, options=['adam'], tunable=False)
return parser
</code></pre>
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@@ -55,6 +55,11 @@
<li class="toctree-l1">
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@@ -597,7 +602,7 @@ def add_model_specific_args(parent_parser, root_dir):
<a href="../methods/" class="btn btn-neutral float-right" title="Methods">Next <span class="icon icon-circle-arrow-right"></span></a>
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@@ -625,7 +630,7 @@ def add_model_specific_args(parent_parser, root_dir):
<a href="https://github.com/williamFalcon/pytorch-lightning/" class="fa fa-github" style="float: left; color: #fcfcfc"> GitHub</a>
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<li class="toctree-l1">
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<li class="toctree-l1">
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@@ -109,6 +114,9 @@
<li class="toctree-l3"><a href="#force-disable-early-stop">Force disable early stop</a></li>
<li class="toctree-l3"><a href="#gradient-clipping">Gradient Clipping</a></li>
<li class="toctree-l3"><a href="#inspect-gradient-norms">Inspect gradient norms</a></li>
@@ -204,6 +212,13 @@ trainer = Trainer(min_nb_epochs=1, max_nb_epochs=1000)
trainer = Trainer(enable_early_stop=True)
</code></pre>
<hr />
<h4 id="gradient-clipping">Gradient Clipping</h4>
<p>Use this to turn off early stopping and run training to the <a href="#force-training-for-min-or-max-epochs">max_epoch</a></p>
<pre><code class="python"># DEFAULT (ie: don't clip)
trainer = Trainer(gradient_clip=0)
</code></pre>
<hr />
<h4 id="inspect-gradient-norms">Inspect gradient norms</h4>
<p>Looking at grad norms can help you figure out where training might be going wrong.</p>
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<li class="toctree-l1">
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+5
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@@ -55,6 +55,11 @@
<li class="toctree-l1">
<a class="" href="../../Examples/">Examples</a>
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+5
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@@ -55,6 +55,11 @@
<li class="toctree-l1">
<a class="" href="../../Examples/">Examples</a>
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<span class="caption-text">LightningModule</span>
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+5
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<li class="toctree-l1">
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<li class="toctree-l1">
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@@ -205,10 +210,8 @@
</ul>
<h6 id="computing-cluster-slurm">Computing cluster (SLURM)</h6>
<ul>
<li>Automatic checkpointing </li>
<li>Automatic saving, loading </li>
<li>Running grid search on a cluster </li>
<li>Walltime auto-resubmit </li>
<li><a href="https://williamfalcon.github.io/pytorch-lightning/Trainer/SLURM%20Managed%20Cluster#running-grid-search-on-a-cluster">Running grid search on a cluster</a> </li>
<li><a href="https://williamfalcon.github.io/pytorch-lightning/Trainer/SLURM%20Managed%20Cluster#walltime-auto-resubmit">Walltime auto-resubmit</a> </li>
</ul>
<h6 id="debugging">Debugging</h6>
<ul>
@@ -243,6 +246,7 @@
<li><a href="https://williamfalcon.github.io/pytorch-lightning/Trainer/Training%20Loop/#anneal-learning-rate">Anneal Learning rate</a></li>
<li><a href="https://williamfalcon.github.io/pytorch-lightning/Trainer/Training%20Loop/#force-training-for-min-or-max-epochs">Force training for min or max epochs</a></li>
<li><a href="https://williamfalcon.github.io/pytorch-lightning/Trainer/Training%20Loop/#force-disable-early-stop">Force disable early stop</a></li>
<li><a href="https://williamfalcon.github.io/pytorch-lightning/Trainer/Training%20Loop/#gradient-clipping">Gradient Clipping: DOC TODO</a></li>
<li><a href="https://williamfalcon.github.io/pytorch-lightning/Pytorch-Lightning/LightningModule/#configure_optimizers">Use multiple optimizers (like GANs)</a></li>
<li><a href="https://williamfalcon.github.io/pytorch-lightning/Trainer/Training%20Loop/#set-how-much-of-the-training-set-to-check">Set how much of the training set to check (1-100%)</a></li>
</ul>
@@ -261,7 +265,7 @@
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@@ -291,7 +295,7 @@
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<span style="margin-left: 15px"><a href="Examples/" style="color: #fcfcfc">Next &raquo;</a></span>
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<li class="toctree-l1">
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<lastmod>2019-06-28</lastmod>
<changefreq>daily</changefreq>
</url>
<url>
<loc>None</loc>
<lastmod>2019-06-28</lastmod>
<changefreq>daily</changefreq>
</url>
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from .example_model import ExampleModel
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import os
import sys
from test_tube import HyperOptArgumentParser, Experiment
from pytorch_lightning.models.trainer import Trainer
from pytorch_lightning.utils.arg_parse import add_default_args
from pytorch_lightning.callbacks.pt_callbacks import EarlyStopping, ModelCheckpoint
from docs.source.examples.example_model import ExampleModel
def main(hparams):
"""
Main training routine specific for this project
:param hparams:
:return:
"""
# init experiment
exp = Experiment(
name=hparams.tt_name,
debug=hparams.debug,
save_dir=hparams.tt_save_path,
version=hparams.hpc_exp_number,
autosave=False,
description=hparams.tt_description
)
exp.argparse(hparams)
exp.save()
# build model
model = ExampleModel(hparams)
# callbacks
early_stop = EarlyStopping(
monitor='val_acc',
patience=3,
mode='min',
verbose=True,
)
model_save_path = '{}/{}/{}'.format(hparams.model_save_path, exp.name, exp.version)
checkpoint = ModelCheckpoint(
filepath=model_save_path,
save_function=None,
save_best_only=True,
verbose=True,
monitor='val_acc',
mode='min'
)
# configure trainer
trainer = Trainer(
experiment=exp,
checkpoint_callback=checkpoint,
early_stop_callback=early_stop,
)
# train model
trainer.fit(model)
if __name__ == '__main__':
# use default args given by lightning
root_dir = os.path.split(os.path.dirname(sys.modules['__main__'].__file__))[0]
parent_parser = HyperOptArgumentParser(strategy='random_search', add_help=False)
add_default_args(parent_parser, root_dir)
# allow model to overwrite or extend args
parser = ExampleModel.add_model_specific_args(parent_parser)
hyperparams = parser.parse_args()
# train model
main(hyperparams)
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@@ -1,211 +0,0 @@
import torch.nn as nn
import numpy as np
from pytorch_lightning.root_module.root_module import LightningModule
from test_tube import HyperOptArgumentParser
from torchvision.datasets import MNIST
import torchvision.transforms as transforms
import torch
import torch.nn.functional as F
import os, pdb
from collections import OrderedDict
class ExampleModel(LightningModule):
"""
Sample model to show how to define a template
"""
def __init__(self, hparams):
# init superclass
super(ExampleModel, self).__init__(hparams)
self.batch_size = hparams.batch_size
# build model
self.__build_model()
# ---------------------
# MODEL SETUP
# ---------------------
def __build_model(self):
"""
Layout model
:return:
"""
self.c_d1 = nn.Linear(in_features=self.hparams.in_features, out_features=self.hparams.hidden_dim)
self.c_d1_bn = nn.BatchNorm1d(self.hparams.hidden_dim)
self.c_d1_drop = nn.Dropout(self.hparams.drop_prob)
self.c_d2 = nn.Linear(in_features=self.hparams.hidden_dim, out_features=self.hparams.out_features)
# ---------------------
# TRAINING
# ---------------------
def forward(self, x):
x = self.c_d1(x)
x = torch.tanh(x)
x = self.c_d1_bn(x)
x = self.c_d1_drop(x)
x = self.c_d2(x)
logits = F.log_softmax(x, dim=1)
return logits
def loss(self, labels, logits):
nll = F.nll_loss(logits, labels)
return nll
def training_step(self, data_batch, batch_i):
"""
Called inside the training loop
:param data_batch:
:return:
"""
# forward pass
x, y = data_batch
x = x.view(x.size(0), -1)
y_hat = self.forward(x)
# calculate loss
loss_val = self.loss(y, y_hat)
output = OrderedDict({
'loss': loss_val,
'tqdm_metrics': {}
})
return output
def validation_step(self, data_batch, batch_i):
"""
Called inside the validation loop
:param data_batch:
:return:
"""
x, y = data_batch
x = x.view(x.size(0), -1)
y_hat = self.forward(x)
loss_val = self.loss(y, y_hat)
# acc
labels_hat = torch.argmax(y_hat, dim=1)
val_acc = torch.sum(y == labels_hat).item() / (len(y) * 1.0)
output = OrderedDict({
'val_loss': loss_val,
'val_acc': torch.tensor(val_acc),
})
return output
def validation_end(self, outputs):
"""
Called at the end of validation to aggregate outputs
:param outputs: list of individual outputs of each validation step
:return:
"""
val_loss_mean = 0
val_acc_mean = 0
for output in outputs:
val_loss_mean += output['val_loss']
val_acc_mean += output['val_acc']
val_loss_mean /= len(outputs)
val_acc_mean /= len(outputs)
tqdm_dic = {'val_loss': val_loss_mean.item(), 'val_acc': val_acc_mean.item()}
return tqdm_dic
def update_tng_log_metrics(self, logs):
return logs
# ---------------------
# MODEL SAVING
# ---------------------
def get_save_dict(self):
checkpoint = {'state_dict': self.state_dict()}
return checkpoint
def load_model_specific(self, checkpoint):
self.load_state_dict(checkpoint['state_dict'])
pass
# ---------------------
# TRAINING SETUP
# ---------------------
def configure_optimizers(self):
"""
return whatever optimizers we want here
:return: list of optimizers
"""
optimizer = self.choose_optimizer(self.hparams.optimizer_name, self.parameters(), {'lr': self.hparams.learning_rate}, 'optimizer')
self.optimizers = [optimizer]
return self.optimizers
def __dataloader(self, train):
# init data generators
transform = transforms.Compose([transforms.ToTensor(), transforms.Normalize((0.5,), (1.0,))])
dataset = MNIST(root=self.hparams.data_root, train=train, transform=transform, download=True)
loader = torch.utils.data.DataLoader(
dataset=dataset,
batch_size=self.hparams.batch_size,
shuffle=True
)
return loader
@property
def tng_dataloader(self):
if self._tng_dataloader is None:
try:
self._tng_dataloader = self.__dataloader(train=True)
except Exception as e:
print(e)
raise e
return self._tng_dataloader
@property
def val_dataloader(self):
if self._val_dataloader is None:
try:
self._val_dataloader = self.__dataloader(train=False)
except Exception as e:
print(e)
raise e
return self._val_dataloader
@property
def test_dataloader(self):
if self._test_dataloader is None:
try:
self._test_dataloader = self.__dataloader(train=False)
except Exception as e:
print(e)
raise e
return self._test_dataloader
@staticmethod
def add_model_specific_args(parent_parser, root_dir):
parser = HyperOptArgumentParser(strategy=parent_parser.strategy, parents=[parent_parser])
# param overwrites
# parser.set_defaults(gradient_clip=5.0)
# network params
parser.opt_list('--drop_prob', default=0.2, options=[0.2, 0.5], type=float, tunable=False)
parser.add_argument('--in_features', default=28*28)
parser.add_argument('--out_features', default=10)
parser.add_argument('--hidden_dim', default=50000) # use 500 for CPU, 50000 for GPU to see speed difference
# data
parser.add_argument('--data_root', default=os.path.join(root_dir, 'mnist'), type=str)
# training params (opt)
parser.opt_list('--learning_rate', default=0.001, type=float, options=[0.0001, 0.0005, 0.001, 0.005],
tunable=False)
parser.opt_list('--batch_size', default=256, type=int, options=[32, 64, 128, 256], tunable=False)
parser.opt_list('--optimizer_name', default='adam', type=str, options=['adam'], tunable=False)
return parser
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import os
import sys
import numpy as np
from time import sleep
import torch
from test_tube import HyperOptArgumentParser, Experiment, SlurmCluster
from pytorch_lightning.models.trainer import Trainer
from pytorch_lightning.utils.arg_parse import add_default_args
from pytorch_lightning.callbacks import EarlyStopping, ModelCheckpoint
SEED = 2334
torch.manual_seed(SEED)
np.random.seed(SEED)
# ---------------------
# DEFINE MODEL HERE
# ---------------------
from docs.source.examples.example_model import ExampleModel
# ---------------------
AVAILABLE_MODELS = {
'model_template': ExampleModel
}
"""
Allows training by using command line arguments
Run by:
# TYPE YOUR RUN COMMAND HERE
"""
def main_local(hparams):
main(hparams, None, None)
def main(hparams, cluster, results_dict):
"""
Main training routine specific for this project
:param hparams:
:return:
"""
on_gpu = hparams.gpus is not None and torch.cuda.is_available()
device = 'cuda' if on_gpu else 'cpu'
hparams.__setattr__('device', device)
hparams.__setattr__('on_gpu', on_gpu)
hparams.__setattr__('nb_gpus', torch.cuda.device_count())
hparams.__setattr__('inference_mode', hparams.model_load_weights_path is not None)
# delay each training start to not overwrite logs
process_position, current_gpu = TRAINING_MODEL.get_process_position(hparams.gpus)
sleep(process_position + 1)
# init experiment
log_dir = os.path.dirname(os.path.realpath(__file__))
exp = Experiment(
name='test_tube_exp',
debug=True,
save_dir=log_dir,
version=0,
autosave=False,
description='test demo'
)
exp.argparse(hparams)
exp.save()
# build model
print('loading model...')
model = TRAINING_MODEL(hparams)
print('model built')
# callbacks
early_stop = EarlyStopping(
monitor=hparams.early_stop_metric,
patience=hparams.early_stop_patience,
verbose=True,
mode=hparams.early_stop_mode
)
model_save_path = '{}/{}/{}'.format(hparams.model_save_path, exp.name, exp.version)
checkpoint = ModelCheckpoint(
filepath=model_save_path,
save_function=None,
save_best_only=True,
verbose=True,
monitor=hparams.model_save_monitor_value,
mode=hparams.model_save_monitor_mode
)
# gpus are ; separated for inside a node and , within nodes
gpu_list = None
if hparams.gpus is not None:
gpu_list = [int(x) for x in hparams.gpus.split(';')]
# configure trainer
trainer = Trainer(
experiment=exp,
cluster=cluster,
checkpoint_callback=checkpoint,
early_stop_callback=early_stop,
gpus=gpu_list
)
# train model
trainer.fit(model)
def get_default_parser(strategy, root_dir):
possible_model_names = list(AVAILABLE_MODELS.keys())
parser = HyperOptArgumentParser(strategy=strategy, add_help=False)
add_default_args(parser, root_dir, possible_model_names=possible_model_names, rand_seed=SEED)
return parser
def get_model_name(args):
for i, arg in enumerate(args):
if 'model_name' in arg:
return args[i+1]
def optimize_on_cluster(hyperparams):
# enable cluster training
cluster = SlurmCluster(
hyperparam_optimizer=hyperparams,
log_path=hyperparams.tt_save_path,
test_tube_exp_name=hyperparams.tt_name
)
# email for cluster coms
cluster.notify_job_status(email='add_email_here', on_done=True, on_fail=True)
# configure cluster
cluster.per_experiment_nb_gpus = hyperparams.per_experiment_nb_gpus
cluster.job_time = '48:00:00'
cluster.gpu_type = '1080ti'
cluster.memory_mb_per_node = 48000
# any modules for code to run in env
cluster.add_command('source activate pytorch_lightning')
# name of exp
job_display_name = hyperparams.tt_name.split('_')[0]
job_display_name = job_display_name[0:3]
# run hopt
print('submitting jobs...')
cluster.optimize_parallel_cluster_gpu(
main,
nb_trials=hyperparams.nb_hopt_trials,
job_name=job_display_name
)
if __name__ == '__main__':
model_name = get_model_name(sys.argv)
if model_name is None:
model_name = 'model_template'
# use default args
root_dir = os.path.dirname(os.path.realpath(__file__))
parent_parser = get_default_parser(strategy='random_search', root_dir=root_dir)
# allow model to overwrite or extend args
TRAINING_MODEL = AVAILABLE_MODELS[model_name]
parser = TRAINING_MODEL.add_model_specific_args(parent_parser, root_dir)
hyperparams = parser.parse_args()
# format GPU layout
os.environ["CUDA_DEVICE_ORDER"] = "PCI_BUS_ID"
# ---------------------
# RUN TRAINING
# ---------------------
# cluster and CPU
if hyperparams.on_cluster:
# run on HPC cluster
print('RUNNING ON SLURM CLUSTER')
gpu_ids = hyperparams.gpus.split(';')
os.environ["CUDA_VISIBLE_DEVICES"] = ','.join(gpu_ids)
optimize_on_cluster(hyperparams)
elif hyperparams.gpus is None:
# run on cpu
print('RUNNING ON CPU')
main(hyperparams, None, None)
# single or multiple GPUs on same machine
gpu_ids = hyperparams.gpus.split(';')
if hyperparams.interactive:
# run on 1 gpu
print(f'RUNNING INTERACTIVE MODE ON GPUS. gpu ids: {gpu_ids}')
os.environ["CUDA_VISIBLE_DEVICES"] = ','.join(gpu_ids)
main(hyperparams, None, None)
else:
# multiple GPUs on same machine
print(f'RUNNING MULTI GPU. GPU ids: {gpu_ids}')
hyperparams.optimize_parallel_gpu(
main_local,
gpu_ids=gpu_ids,
nb_trials=hyperparams.nb_hopt_trials,
nb_workers=len(gpu_ids)
)
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