def train(subject_id):
subject_range = [subject_id]
##### subject_range = [x for x in range(1, 10)]
dataset = MOABBDataset(dataset_name="BNCI2014001",
subject_ids=subject_range)
######################################################################
# Preprocessing
low_cut_hz = 4. # low cut frequency for filtering
high_cut_hz = 38. # high cut frequency for filtering
# Parameters for exponential moving standardization
factor_new = 1e-3
init_block_size = 1000
preprocessors = [
Preprocessor('pick_types', eeg=True, eog=False, meg=False,
stim=False), # Keep EEG sensors
Preprocessor(lambda x: x * 1e6), # Convert from V to uV
Preprocessor('filter', l_freq=low_cut_hz,
h_freq=high_cut_hz), # Bandpass filter
Preprocessor('set_eeg_reference',
ref_channels='average',
ch_type='eeg'),
Preprocessor('resample', sfreq=125),
## Preprocessor(exponential_moving_standardize, # Exponential moving standardization
## factor_new=factor_new, init_block_size=init_block_size)
## Preprocessor('pick_channels', ch_names=short_ch_names, ordered=True),
]
# Transform the data
preprocess(dataset, preprocessors)
######################################################################
# Cut Compute Windows
# ~~~~~~~~~~~~~~~~~~~
trial_start_offset_seconds = -0.0
# Extract sampling frequency, check that they are same in all datasets
sfreq = dataset.datasets[0].raw.info['sfreq']
assert all([ds.raw.info['sfreq'] == sfreq for ds in dataset.datasets])
# Calculate the trial start offset in samples.
trial_start_offset_samples = int(trial_start_offset_seconds * sfreq)
# Create windows using braindecode function for this. It needs parameters to define how
# trials should be used.
windows_dataset = create_windows_from_events(
dataset,
# picks=["Fz", "FC3", "FC1", "FCz", "FC2", "FC4", "C5", "C3", "C1", "Cz", "C2", "C4", "C6", "CP3", "CP1", "CPz", "CP2", "CP4", "P1", "Pz", "P2", "POz"],
trial_start_offset_samples=trial_start_offset_samples,
trial_stop_offset_samples=0,
preload=True,
)
######################################################################
# Split dataset into train and valid
splitted = windows_dataset.split('session')
train_set = splitted['session_T']
valid_set = splitted['session_E']
######################################################################
# Create model
cuda = torch.cuda.is_available(
) # check if GPU is available, if True chooses to use it
device = 'cuda' if cuda else 'cpu'
if cuda:
torch.backends.cudnn.benchmark = True
seed = 20200220 # random seed to make results reproducible
# Set random seed to be able to reproduce results
set_random_seeds(seed=seed, cuda=cuda)
n_classes = 4
# Extract number of chans and time steps from dataset
n_chans = train_set[0][0].shape[0]
input_window_samples = train_set[0][0].shape[1]
model = ShallowFBCSPNet(n_chans,
n_classes,
input_window_samples=input_window_samples,
final_conv_length='auto')
"""
model = EEGNetv1(
n_chans,
n_classes,
input_window_samples=input_window_samples,
final_conv_length="auto",
pool_mode="mean",
second_kernel_size=(2, 32),
third_kernel_size=(8, 4),
drop_prob=0.25)
"""
"""
model = HybridNet(n_chans, n_classes,
input_window_samples=input_window_samples)
"""
"""
model = TCN(n_chans, n_classes,
n_blocks=6,
n_filters=32,
kernel_size=9,
drop_prob=0.0,
add_log_softmax=True)
"""
"""
model = EEGNetv4(n_chans,
n_classes,
input_window_samples=input_window_samples,
final_conv_length="auto",
pool_mode="mean",
F1=8,
D=2,
F2=16, # usually set to F1*D (?)
kernel_length=64,
third_kernel_size=(8, 4),
drop_prob=0.2)
"""
if cuda:
model.cuda()
######################################################################
# Training
# These values we found good for shallow network:
lr = 0.01 # 0.0625 * 0.01
weight_decay = 0.0005
# For deep4 they should be:
# lr = 1 * 0.01
# weight_decay = 0.5 * 0.001
batch_size = 64
n_epochs = 80
clf = EEGClassifier(
model,
criterion=torch.nn.NLLLoss,
optimizer=torch.optim.SGD, #AdamW,
train_split=predefined_split(
valid_set), # using valid_set for validation
optimizer__lr=lr,
optimizer__momentum=0.9,
optimizer__weight_decay=weight_decay,
batch_size=batch_size,
callbacks=[
"accuracy", #("lr_scheduler", LRScheduler('CosineAnnealingLR', T_max=n_epochs - 1)),
],
device=device,
)
# Model training for a specified number of epochs. `y` is None as it is already supplied
# in the dataset.
clf.fit(train_set, y=None, epochs=n_epochs)
results_columns = [
'train_loss', 'valid_loss', 'train_accuracy', 'valid_accuracy'
]
df = pd.DataFrame(clf.history[:, results_columns],
columns=results_columns,
index=clf.history[:, 'epoch'])
val_accs = df['valid_accuracy'].values
max_val_acc = 100.0 * np.max(val_accs)
return max_val_acc
