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ex1_burgers_super_res.py
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ex1_burgers_super_res.py
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'''
zero-shot super-resolution
train: 2048 grid
val: 8192 grid
'''
from libs_path import *
from libs import *
def main():
args = get_args_1d()
cuda = not args.no_cuda and torch.cuda.is_available()
device = torch.device('cuda' if cuda else 'cpu')
kwargs = {'pin_memory': True} if cuda else {}
get_seed(args.seed, printout=False)
data_path = os.path.join(DATA_PATH, 'burgers_data_R10.mat')
train_dataset = BurgersDataset(subsample=4,
train_data=True,
train_portion=0.5,
data_path=data_path,)
valid_dataset = BurgersDataset(subsample=1,
train_data=False,
valid_portion=100,
data_path=data_path,)
train_loader = DataLoader(train_dataset,
batch_size=args.batch_size,
shuffle=True,
drop_last=True, **kwargs)
valid_loader = DataLoader(valid_dataset,
batch_size=args.val_batch_size,
shuffle=False,
drop_last=False, **kwargs)
sample = next(iter(train_loader))
print('='*20, 'Data loader batch', '='*20)
for key in sample.keys():
print(key, "\t", sample[key].shape)
print('='*(40 + len('Data loader batch')+2))
if is_interactive():
u0 = sample['node']
pos = sample['pos']
u = sample['target']
_, axes = plt.subplots(nrows=4, ncols=1, figsize=(15, 10))
axes = axes.reshape(-1)
indexes = np.random.choice(range(4), size=4, replace=False)
for i, ix in enumerate(indexes):
axes[i].plot(pos[ix], u0[ix], label='input')
axes[i].plot(pos[ix], u[ix, :, 0], label='target')
axes[i].plot(pos[ix, 1:-1], u[ix, 1:-1, 1],
label='target derivative')
axes[i].legend()
with open(os.path.join(SRC_ROOT, 'config.yml')) as f:
config = yaml.full_load(f)
test_name = os.path.basename(__file__).split('.')[0]
config = config['ex1_burgers']
config['attn_norm'] = not args.layer_norm
for arg in vars(args):
if arg in config.keys():
config[arg] = getattr(args, arg)
get_seed(args.seed)
torch.cuda.empty_cache()
model = SimpleTransformer(**config)
model = model.to(device)
print(
f"\nModel: {model.__name__}\t Number of params: {get_num_params(model)}")
model_name, result_name = get_model_name(model='burgers',
num_encoder_layers=config['num_encoder_layers'],
n_hidden=config['n_hidden'],
attention_type=config['attention_type'],
layer_norm=config['layer_norm'],
grid_size=int(
2**13//args.subsample),
additional_str='super_res',
)
print(f"Saving model and result in {MODEL_PATH}/{model_name}\n")
epochs = args.epochs
lr = args.lr
h_train = (1/2**13)*4
h_eval = (1/2**13)
tqdm_mode = 'epoch' if not args.show_batch else 'batch'
optimizer = torch.optim.Adam(model.parameters(), lr=lr)
scheduler = OneCycleLR(optimizer, max_lr=lr, div_factor=1e4, final_div_factor=1e4,
steps_per_epoch=len(train_loader), epochs=epochs)
loss_func = WeightedL2Loss(regularizer=True, h=h_train, gamma=args.gamma)
metric_func = WeightedL2Loss(regularizer=False, h=h_eval)
result = run_train(model, loss_func, metric_func,
train_loader, valid_loader,
optimizer, scheduler,
train_batch=train_batch_burgers,
validate_epoch=validate_epoch_burgers,
epochs=epochs,
patience=None,
tqdm_mode=tqdm_mode,
model_name=model_name,
result_name=result_name,
device=device)
model.load_state_dict(torch.load(os.path.join(MODEL_PATH, model_name)))
model.eval()
val_metric = validate_epoch_burgers(
model, metric_func, valid_loader, device)
print(f"\nBest model's validation metric in this run: {val_metric}")
plt.figure(1)
loss_train = result['loss_train']
loss_val = result['loss_val']
plt.semilogy(loss_train[:, 0], label='train')
plt.semilogy(loss_val, label='valid')
plt.grid(True, which="both", ls="--")
plt.legend()
plt.show()
sample = next(iter(valid_loader))
node = sample['node']
pos = sample['pos']
grid = sample['grid']
u = sample['target']
with torch.no_grad():
model.eval()
out_dict = model(node.to(device), None,
pos.to(device), grid.to(device))
out = out_dict['preds']
preds = out[..., 0].detach().cpu()
_, axes = plt.subplots(nrows=args.val_batch_size,
ncols=1, figsize=(20, 5*args.val_batch_size))
axes = axes.reshape(-1)
for i in range(args.val_batch_size):
grid = pos[i, :, 0]
axes[i].plot(grid, node[i, :, 0], '.',
color='b', linewidth=1, label='f')
axes[i].plot(grid, u[i, :, 0], color='g', linewidth=2, label='u')
axes[i].plot(grid, preds[i, :], '--', color='r',
linewidth=2, label='u_preds')
axes[i].legend()
plt.show()
if __name__ == '__main__':
main()