def train_and_eval(train_data,
val_data,
test_data,
device='cuda',
model_class=MF,
base_model_args: dict = {
'emb_dim': 64,
'learning_rate': 0.05,
'weight_decay': 0.05
},
position_model_args: dict = {
'learning_rate': 0.05,
'weight_decay': 0.05
},
training_args: dict = {
'batch_size': 1024,
'epochs': 100,
'patience': 20,
'block_batch': [1000, 100]
}):
train_position = train_data['position']
train_rating = train_data['rating']
# build data_loader.
train_loader = utils.data_loader.User(
train_position,
train_rating,
u_batch_size=training_args['block_batch'][0],
device=device)
val_loader = utils.data_loader.DataLoader(
utils.data_loader.Interactions(val_data),
batch_size=training_args['batch_size'],
shuffle=False,
num_workers=0)
test_loader = utils.data_loader.DataLoader(
utils.data_loader.Interactions(test_data),
batch_size=training_args['batch_size'],
shuffle=False,
num_workers=0)
n_user, n_item = train_position.shape
n_position = torch.max(train_position._values()).item() + 1
base_model = MF(n_user, n_item, dim=base_model_args['emb_dim']).to(device)
base_optimizer = torch.optim.SGD(base_model.parameters(),
lr=base_model_args['learning_rate'],
weight_decay=0)
position_model = Position(n_position).to(device)
position_optimizer = torch.optim.SGD(
position_model.parameters(),
lr=position_model_args['learning_rate'],
weight_decay=0)
# begin training
stopping_args = Stop_args(patience=training_args['patience'],
max_epochs=training_args['epochs'])
early_stopping = EarlyStopping(base_model, **stopping_args)
none_criterion = nn.MSELoss(reduction='none')
for epo in range(early_stopping.max_epochs):
for u_batch_idx, users in enumerate(train_loader.User_loader):
base_model.train()
position_model.train()
# observation data in this batch
users_train, items_train, positions_train, y_train = train_loader.get_batch(
users)
first_index_row = torch.where(
positions_train == 0)[0] // n_position
first_index_col = torch.where(positions_train == 0)[0] % n_position
y_hat = base_model(users_train, items_train)
p_hat = position_model(positions_train)
# users_train = users_train.view(-1, n_position)
# items_train = items_train.view(-1, n_position)
# positions_train = positions_train.view(-1, n_position)
y_train = y_train.view(-1, n_position)
y_hat = y_hat.view(-1, n_position)
p_hat = p_hat.view(-1, n_position)
y_hat_som = torch.softmax(y_hat, dim=-1) # softmax
p_hat_som = torch.softmax(p_hat, dim=-1)
IRW = torch.detach(
y_hat_som[first_index_row, first_index_col].unsqueeze(dim=-1) *
torch.reciprocal(y_hat_som))
IPW = torch.detach(
p_hat_som[first_index_row, first_index_col].unsqueeze(dim=-1) *
torch.reciprocal(p_hat_som))
cost_base = none_criterion(y_hat, y_train)
# IPW = torch.ones(IPW.shape).to(device)
loss_IPW = torch.sum(IPW * cost_base) + base_model_args[
'weight_decay'] * base_model.l2_norm(users_train, items_train)
cost_position = none_criterion(p_hat, y_train)
loss_IRW = torch.sum(IRW * cost_position) + position_model_args[
'weight_decay'] * position_model.l2_norm(positions_train)
# y_train = y_train == 1
# loss_IRW = - torch.sum(y_train * IRW * torch.log(p_hat_som)) + position_model_args['weight_decay'] * position_model.l2_norm(positions_train)
# loss_IPW = - torch.sum(y_train * IPW * torch.log(y_hat_som)) + base_model_args['weight_decay'] * base_model.l2_norm(users_train, items_train)
base_optimizer.zero_grad()
loss_IPW.backward()
base_optimizer.step()
position_optimizer.zero_grad()
loss_IRW.backward()
position_optimizer.step()
base_model.eval()
with torch.no_grad():
# training metrics
train_pre_ratings = torch.empty(0).to(device)
train_ratings = torch.empty(0).to(device)
for u_batch_idx, users in enumerate(train_loader.User_loader):
users_train, items_train, positions_train, y_train = train_loader.get_batch(
users)
pre_ratings = base_model(users_train, items_train)
train_pre_ratings = torch.cat((train_pre_ratings, pre_ratings))
train_ratings = torch.cat((train_ratings, y_train))
# validation metrics
val_pre_ratings = torch.empty(0).to(device)
val_ratings = torch.empty(0).to(device)
for batch_idx, (users, items, ratings) in enumerate(val_loader):
pre_ratings = base_model(users, items)
val_pre_ratings = torch.cat((val_pre_ratings, pre_ratings))
val_ratings = torch.cat((val_ratings, ratings))
train_results = utils.metrics.evaluate(train_pre_ratings,
train_ratings, ['MSE', 'NLL'])
val_results = utils.metrics.evaluate(val_pre_ratings, val_ratings,
['MSE', 'NLL', 'AUC'])
print('Epoch: {0:2d} / {1}, Traning: {2}, Validation: {3}'.format(
epo, training_args['epochs'], ' '.join([
key + ':' + '%.3f' % train_results[key]
for key in train_results
]), ' '.join([
key + ':' + '%.3f' % val_results[key] for key in val_results
])))
if early_stopping.check([val_results['AUC']], epo):
break
# testing loss
print('Loading {}th epoch'.format(early_stopping.best_epoch))
base_model.load_state_dict(early_stopping.best_state)
# validation metrics
val_pre_ratings = torch.empty(0).to(device)
val_ratings = torch.empty(0).to(device)
for batch_idx, (users, items, ratings) in enumerate(val_loader):
pre_ratings = base_model(users, items)
val_pre_ratings = torch.cat((val_pre_ratings, pre_ratings))
val_ratings = torch.cat((val_ratings, ratings))
# test metrics
test_users = torch.empty(0, dtype=torch.int64).to(device)
test_items = torch.empty(0, dtype=torch.int64).to(device)
test_pre_ratings = torch.empty(0).to(device)
test_ratings = torch.empty(0).to(device)
for batch_idx, (users, items, ratings) in enumerate(test_loader):
pre_ratings = base_model(users, items)
test_users = torch.cat((test_users, users))
test_items = torch.cat((test_items, items))
test_pre_ratings = torch.cat((test_pre_ratings, pre_ratings))
test_ratings = torch.cat((test_ratings, ratings))
val_results = utils.metrics.evaluate(val_pre_ratings, val_ratings,
['MSE', 'NLL', 'AUC'])
test_results = utils.metrics.evaluate(
test_pre_ratings,
test_ratings, ['MSE', 'NLL', 'AUC', 'Recall_Precision_NDCG@'],
users=test_users,
items=test_items)
print('-' * 30)
print('The performance of validation set: {}'.format(' '.join(
[key + ':' + '%.3f' % val_results[key] for key in val_results])))
print('The performance of testing set: {}'.format(' '.join(
[key + ':' + '%.3f' % test_results[key] for key in test_results])))
print('-' * 30)
return val_results, test_results
def train_and_eval(train_data,
val_data,
test_data,
device='cuda',
model_class=MF,
model_args: dict = {
'emb_dim': 64,
'learning_rate': 0.05,
'weight_decay': 0.05
},
training_args: dict = {
'batch_size': 1024,
'epochs': 100,
'patience': 20,
'block_batch': [1000, 100]
}):
# build data_loader.
train_loader = utils.data_loader.Block(
train_data,
u_batch_size=training_args['block_batch'][0],
i_batch_size=training_args['block_batch'][1],
device=device)
val_loader = utils.data_loader.DataLoader(
utils.data_loader.Interactions(val_data),
batch_size=training_args['batch_size'],
shuffle=False,
num_workers=0)
test_loader = utils.data_loader.DataLoader(
utils.data_loader.Interactions(test_data),
batch_size=training_args['batch_size'],
shuffle=False,
num_workers=0)
# data shape
n_user, n_item = train_data.shape
# model and its optimizer.
model = MF(n_user, n_item, dim=model_args['emb_dim'], dropout=0).to(device)
optimizer = torch.optim.SGD(model.parameters(),
lr=model_args['learning_rate'],
weight_decay=0)
# loss_criterion
criterion = nn.MSELoss(reduction='sum')
def complement(u, i, u_all, i_all):
mask_u = np.isin(u_all.cpu().numpy(), u.cpu().numpy())
mask_i = np.isin(i_all.cpu().numpy(), i.cpu().numpy())
mask = torch.tensor(1 - mask_u * mask_i).to('cuda')
return mask
# begin training
stopping_args = Stop_args(patience=training_args['patience'],
max_epochs=training_args['epochs'])
early_stopping = EarlyStopping(model, **stopping_args)
for epo in range(early_stopping.max_epochs):
training_loss = 0
for u_batch_idx, users in enumerate(train_loader.User_loader):
for i_batch_idx, items in enumerate(train_loader.Item_loader):
# loss of training set
model.train()
users_train, items_train, y_train = train_loader.get_batch(
users, items)
y_hat_obs = model(users_train, items_train)
loss_obs = criterion(y_hat_obs, y_train)
all_pair = torch.cartesian_prod(users, items)
users_all, items_all = all_pair[:, 0], all_pair[:, 1]
y_hat_all = model(users_all, items_all)
impu_all = torch.zeros((users_all.shape)).to(device) - 1
# mask = complement(users_train, items_train, users_all, items_all)
# loss_all = criterion(y_hat_all * mask, impu_all * mask)
loss_all = criterion(y_hat_all, impu_all)
loss = loss_obs + model_args[
'imputaion_lambda'] * loss_all + model_args[
'weight_decay'] * model.l2_norm(users_all, items_all)
optimizer.zero_grad()
loss.backward()
optimizer.step()
training_loss += loss.item()
model.eval()
with torch.no_grad():
# train metrics
train_pre_ratings = torch.empty(0).to(device)
train_ratings = torch.empty(0).to(device)
for u_batch_idx, users in enumerate(train_loader.User_loader):
for i_batch_idx, items in enumerate(train_loader.Item_loader):
users_train, items_train, y_train = train_loader.get_batch(
users, items)
pre_ratings = model(users_train, items_train)
train_pre_ratings = torch.cat(
(train_pre_ratings, pre_ratings))
train_ratings = torch.cat((train_ratings, y_train))
# validation metrics
val_pre_ratings = torch.empty(0).to(device)
val_ratings = torch.empty(0).to(device)
for batch_idx, (users, items, ratings) in enumerate(val_loader):
pre_ratings = model(users, items)
val_pre_ratings = torch.cat((val_pre_ratings, pre_ratings))
val_ratings = torch.cat((val_ratings, ratings))
train_results = utils.metrics.evaluate(train_pre_ratings,
train_ratings, ['MSE', 'NLL'])
val_results = utils.metrics.evaluate(val_pre_ratings, val_ratings,
['MSE', 'NLL', 'AUC'])
print('Epoch: {0:2d} / {1}, Traning: {2}, Validation: {3}'.format(
epo, training_args['epochs'], ' '.join([
key + ':' + '%.3f' % train_results[key]
for key in train_results
]), ' '.join([
key + ':' + '%.3f' % val_results[key] for key in val_results
])))
if early_stopping.check([val_results['AUC']], epo):
break
# testing loss
print('Loading {}th epoch'.format(early_stopping.best_epoch))
model.load_state_dict(early_stopping.best_state)
# validation metrics
val_pre_ratings = torch.empty(0).to(device)
val_ratings = torch.empty(0).to(device)
for batch_idx, (users, items, ratings) in enumerate(val_loader):
pre_ratings = model(users, items)
val_pre_ratings = torch.cat((val_pre_ratings, pre_ratings))
val_ratings = torch.cat((val_ratings, ratings))
# test metrics
test_users = torch.empty(0, dtype=torch.int64).to(device)
test_items = torch.empty(0, dtype=torch.int64).to(device)
test_pre_ratings = torch.empty(0).to(device)
test_ratings = torch.empty(0).to(device)
for batch_idx, (users, items, ratings) in enumerate(test_loader):
pre_ratings = model(users, items)
test_users = torch.cat((test_users, users))
test_items = torch.cat((test_items, items))
test_pre_ratings = torch.cat((test_pre_ratings, pre_ratings))
test_ratings = torch.cat((test_ratings, ratings))
val_results = utils.metrics.evaluate(val_pre_ratings, val_ratings,
['MSE', 'NLL', 'AUC'])
test_results = utils.metrics.evaluate(
test_pre_ratings,
test_ratings, ['MSE', 'NLL', 'AUC', 'Recall_Precision_NDCG@'],
users=test_users,
items=test_items)
print('-' * 30)
print('The performance of validation set: {}'.format(' '.join(
[key + ':' + '%.3f' % val_results[key] for key in val_results])))
print('The performance of testing set: {}'.format(' '.join(
[key + ':' + '%.3f' % test_results[key] for key in test_results])))
print('-' * 30)
return val_results, test_results
def train_and_eval(train_data,
unif_train_data,
val_data,
test_data,
device='cuda',
model_args: dict = {
'emb_dim': 64,
'learning_rate': 0.01,
'weight_decay': 0.1
},
training_args: dict = {
'batch_size': 1024,
'epochs': 100,
'patience': 20,
'block_batch': [1000, 100]
}):
# build data_loader.
train_loader = utils.data_loader.Block(
train_data,
u_batch_size=training_args['block_batch'][0],
i_batch_size=training_args['block_batch'][1],
device=device)
val_loader = utils.data_loader.DataLoader(
utils.data_loader.Interactions(val_data),
batch_size=training_args['batch_size'],
shuffle=False,
num_workers=0)
test_loader = utils.data_loader.DataLoader(
utils.data_loader.Interactions(test_data),
batch_size=training_args['batch_size'],
shuffle=False,
num_workers=0)
# Naive Bayes propensity Estimator
def Naive_Bayes_Propensity(train, unif):
# the implementation of naive bayes propensity
P_Oeq1 = train._nnz() / (train.size()[0] * train.size()[1])
y_unique = torch.unique(train._values())
P_y_givenO = torch.zeros(y_unique.shape).to(device)
P_y = torch.zeros(y_unique.shape).to(device)
for i in range(len(y_unique)):
P_y_givenO[i] = torch.sum(
train._values() == y_unique[i]) / torch.sum(
torch.ones(train._values().shape).to(device))
P_y[i] = torch.sum(unif._values() == y_unique[i]) / torch.sum(
torch.ones(unif._values().shape).to(device))
Propensity = P_y_givenO * P_Oeq1 / P_y
return y_unique, Propensity
y_unique, Propensity = Naive_Bayes_Propensity(train_data, unif_train_data)
InvP = torch.reciprocal(Propensity)
# data shape
n_user, n_item = train_data.shape
# model and its optimizer.
model = MF(n_user, n_item, dim=model_args['emb_dim'], dropout=0).to(device)
optimizer = torch.optim.SGD(model.parameters(),
lr=model_args['learning_rate'],
weight_decay=0)
# loss_criterion
none_criterion = nn.MSELoss(reduction='none')
# begin training
stopping_args = Stop_args(patience=training_args['patience'],
max_epochs=training_args['epochs'])
early_stopping = EarlyStopping(model, **stopping_args)
for epo in range(early_stopping.max_epochs):
training_loss = 0
for u_batch_idx, users in enumerate(train_loader.User_loader):
for i_batch_idx, items in enumerate(train_loader.Item_loader):
# loss of training set
model.train()
users_train, items_train, y_train = train_loader.get_batch(
users, items)
y_hat = model(users_train, items_train)
cost = none_criterion(y_hat, y_train)
weight = torch.ones(y_train.shape).to(device)
for i in range(len(y_unique)):
weight[y_train == y_unique[i]] = InvP[i]
loss = torch.sum(
weight * cost
) + model_args['weight_decay'] * model.l2_norm(users, items)
optimizer.zero_grad()
loss.backward()
optimizer.step()
training_loss += loss.item()
model.eval()
with torch.no_grad():
# train metrics
train_pre_ratings = torch.empty(0).to(device)
train_ratings = torch.empty(0).to(device)
for u_batch_idx, users in enumerate(train_loader.User_loader):
for i_batch_idx, items in enumerate(train_loader.Item_loader):
users_train, items_train, y_train = train_loader.get_batch(
users, items)
pre_ratings = model(users_train, items_train)
train_pre_ratings = torch.cat(
(train_pre_ratings, pre_ratings))
train_ratings = torch.cat((train_ratings, y_train))
# validation metrics
val_pre_ratings = torch.empty(0).to(device)
val_ratings = torch.empty(0).to(device)
for batch_idx, (users, items, ratings) in enumerate(val_loader):
pre_ratings = model(users, items)
val_pre_ratings = torch.cat((val_pre_ratings, pre_ratings))
val_ratings = torch.cat((val_ratings, ratings))
train_results = utils.metrics.evaluate(train_pre_ratings,
train_ratings, ['MSE', 'NLL'])
val_results = utils.metrics.evaluate(val_pre_ratings, val_ratings,
['MSE', 'NLL', 'AUC'])
print('Epoch: {0:2d} / {1}, Traning: {2}, Validation: {3}'.format(
epo, training_args['epochs'], ' '.join([
key + ':' + '%.3f' % train_results[key]
for key in train_results
]), ' '.join([
key + ':' + '%.3f' % val_results[key] for key in val_results
])))
if early_stopping.check([val_results['AUC']], epo):
break
# testing loss
print('Loading {}th epoch'.format(early_stopping.best_epoch))
model.load_state_dict(early_stopping.best_state)
# validation metrics
val_pre_ratings = torch.empty(0).to(device)
val_ratings = torch.empty(0).to(device)
for batch_idx, (users, items, ratings) in enumerate(val_loader):
pre_ratings = model(users, items)
val_pre_ratings = torch.cat((val_pre_ratings, pre_ratings))
val_ratings = torch.cat((val_ratings, ratings))
# test metrics
test_users = torch.empty(0, dtype=torch.int64).to(device)
test_items = torch.empty(0, dtype=torch.int64).to(device)
test_pre_ratings = torch.empty(0).to(device)
test_ratings = torch.empty(0).to(device)
for batch_idx, (users, items, ratings) in enumerate(test_loader):
pre_ratings = model(users, items)
test_users = torch.cat((test_users, users))
test_items = torch.cat((test_items, items))
test_pre_ratings = torch.cat((test_pre_ratings, pre_ratings))
test_ratings = torch.cat((test_ratings, ratings))
val_results = utils.metrics.evaluate(val_pre_ratings, val_ratings,
['MSE', 'NLL', 'AUC'])
test_results = utils.metrics.evaluate(
test_pre_ratings,
test_ratings, ['MSE', 'NLL', 'AUC', 'Recall_Precision_NDCG@'],
users=test_users,
items=test_items)
print('-' * 30)
print('The performance of validation set: {}'.format(' '.join(
[key + ':' + '%.3f' % val_results[key] for key in val_results])))
print('The performance of testing set: {}'.format(' '.join(
[key + ':' + '%.3f' % test_results[key] for key in test_results])))
print('-' * 30)
return val_results, test_results
def train_and_eval(
train_data,
unif_train_data,
val_data,
test_data,
device='cuda',
base_model_args: dict = {
'emb_dim': 64,
'dropout': 0.0,
'learning_rate': 0.05,
'imputaion_lambda': 0.01,
'weight_decay': 0.05
},
weight1_model_args: dict = {
'learning_rate': 0.1,
'weight_decay': 0.005
},
weight2_model_args: dict = {
'learning_rate': 0.1,
'weight_decay': 0.005
},
imputation_model_args: dict = {
'learning_rate': 0.01,
'weight_decay': 0.5
},
training_args: dict = {
'batch_size': 1024,
'epochs': 100,
'patience': 20,
'block_batch': [1000, 100]
}):
train_position = train_data['position']
train_rating = train_data['rating']
train_dense = train_rating.to_dense()
# uniform data
users_unif = unif_train_data._indices()[0]
items_unif = unif_train_data._indices()[1]
y_unif = unif_train_data._values()
# build data_loader.
train_loader = utils.data_loader.User(
train_position,
train_rating,
u_batch_size=training_args['block_batch'][0],
device=device)
val_loader = utils.data_loader.DataLoader(
utils.data_loader.Interactions(val_data),
batch_size=training_args['batch_size'],
shuffle=False,
num_workers=0)
test_loader = utils.data_loader.DataLoader(
utils.data_loader.Interactions(test_data),
batch_size=training_args['batch_size'],
shuffle=False,
num_workers=0)
n_user, n_item = train_position.shape
n_position = torch.max(train_position._values()).item() + 1
# base model and its optimizer
base_model = MetaMF(n_user,
n_item,
dim=base_model_args['emb_dim'],
dropout=0).to(device)
base_optimizer = torch.optim.SGD(
base_model.params(),
lr=base_model_args['learning_rate'],
weight_decay=0) # todo: other optimizer SGD
# meta models and their optimizer
weight1_model = FourLinear(n_user, n_item, 2,
n_position=n_position).to(device)
weight1_optimizer = torch.optim.Adam(
weight1_model.parameters(),
lr=weight1_model_args['learning_rate'],
weight_decay=weight1_model_args['weight_decay'])
weight2_model = ThreeLinear(n_user, n_item, 2).to(device)
weight2_optimizer = torch.optim.Adam(
weight2_model.parameters(),
lr=weight2_model_args['learning_rate'],
weight_decay=weight2_model_args['weight_decay'])
imputation_model = OneLinear(3).to(device)
imputation_optimizer = torch.optim.Adam(
imputation_model.parameters(),
lr=imputation_model_args['learning_rate'],
weight_decay=imputation_model_args['weight_decay'])
# loss_criterion
sum_criterion = nn.MSELoss(reduction='sum')
none_criterion = nn.MSELoss(reduction='none')
# begin training
stopping_args = Stop_args(patience=training_args['patience'],
max_epochs=training_args['epochs'])
early_stopping = EarlyStopping(base_model, **stopping_args)
for epo in range(early_stopping.max_epochs):
training_loss = 0
for u_batch_idx, users in enumerate(train_loader.User_loader):
users_train, items_train, positions_train, y_train = train_loader.get_batch(
users)
# all pair
all_pair = torch.cartesian_prod(users,
torch.arange(n_item).to(device))
users_all, items_all = all_pair[:, 0], all_pair[:, 1]
# calculate weight1
weight1_model.train()
weight1 = weight1_model(users_train, items_train,
(y_train == 1) * 1, positions_train)
weight1 = torch.exp(weight1 / 5) # for stable training
# calculate weight2
weight2_model.train()
weight2 = weight2_model(users_all, items_all,
(train_dense[users_all, items_all] != 0) *
1)
weight2 = torch.exp(weight2 / 5) #for stable training
# calculate imputation values
imputation_model.train()
impu_f_all = torch.tanh(
imputation_model((train_dense[users_all, items_all]).long() +
1))
# one_step_model: assumed model, just update one step on base model. it is for updating weight parameters
one_step_model = MetaMF(n_user,
n_item,
dim=base_model_args['emb_dim'],
dropout=0)
one_step_model.load_state_dict(base_model.state_dict())
# formal parameter: Using training set to update parameters
one_step_model.train()
# all pair data in this block
y_hat_f_all = one_step_model(users_all, items_all)
cost_f_all = none_criterion(y_hat_f_all, impu_f_all)
loss_f_all = torch.sum(cost_f_all * weight2)
# observation data
y_hat_f_obs = one_step_model(users_train, items_train)
cost_f_obs = none_criterion(y_hat_f_obs, y_train)
loss_f_obs = torch.sum(cost_f_obs * weight1)
loss_f = loss_f_obs + base_model_args[
'imputaion_lambda'] * loss_f_all + base_model_args[
'weight_decay'] * one_step_model.l2_norm(
users_all, items_all)
# update parameters of one_step_model
one_step_model.zero_grad()
grads = torch.autograd.grad(loss_f, (one_step_model.params()),
create_graph=True)
one_step_model.update_params(base_model_args['learning_rate'],
source_params=grads)
# latter hyper_parameter: Using uniform set to update hyper_parameters
y_hat_l = one_step_model(users_unif, items_unif)
loss_l = sum_criterion(y_hat_l, y_unif)
# update weight parameters
weight1_optimizer.zero_grad()
weight2_optimizer.zero_grad()
imputation_optimizer.zero_grad()
loss_l.backward()
if epo >= 20:
weight1_optimizer.step()
weight2_optimizer.step()
imputation_optimizer.step()
# use new weights to update parameters
weight1_model.train()
weight1 = weight1_model(users_train, items_train,
(y_train == 1) * 1, positions_train)
weight1 = torch.exp(weight1 / 5) # for stable training
# calculate weight2
weight2_model.train()
weight2 = weight2_model(users_all, items_all,
(train_dense[users_all, items_all] != 0) *
1)
weight2 = torch.exp(weight2 / 5) # for stable training
# use new imputation to update parameters
imputation_model.train()
impu_all = torch.tanh(
imputation_model((train_dense[users_all, items_all]).long() +
1))
# loss of training set
base_model.train()
# all pair
y_hat_all = base_model(users_all, items_all)
cost_all = none_criterion(y_hat_all, impu_all)
loss_all = torch.sum(cost_all * weight2)
# observation
y_hat_obs = base_model(users_train, items_train)
cost_obs = none_criterion(y_hat_obs, y_train)
loss_obs = torch.sum(cost_obs * weight1)
loss = loss_obs + base_model_args[
'imputaion_lambda'] * loss_all + base_model_args[
'weight_decay'] * base_model.l2_norm(users_all, items_all)
base_optimizer.zero_grad()
loss.backward()
base_optimizer.step()
training_loss += loss.item()
base_model.eval()
with torch.no_grad():
# training metrics
train_pre_ratings = torch.empty(0).to(device)
train_ratings = torch.empty(0).to(device)
for u_batch_idx, users in enumerate(train_loader.User_loader):
users_train, items_train, positions_train, y_train = train_loader.get_batch(
users)
pre_ratings = base_model(users_train, items_train)
train_pre_ratings = torch.cat((train_pre_ratings, pre_ratings))
train_ratings = torch.cat((train_ratings, y_train))
# validation metrics
val_pre_ratings = torch.empty(0).to(device)
val_ratings = torch.empty(0).to(device)
for batch_idx, (users, items, ratings) in enumerate(val_loader):
pre_ratings = base_model(users, items)
val_pre_ratings = torch.cat((val_pre_ratings, pre_ratings))
val_ratings = torch.cat((val_ratings, ratings))
train_results = utils.metrics.evaluate(train_pre_ratings,
train_ratings, ['MSE', 'NLL'])
val_results = utils.metrics.evaluate(val_pre_ratings, val_ratings,
['MSE', 'NLL', 'AUC'])
print('Epoch: {0:2d} / {1}, Traning: {2}, Validation: {3}'.format(
epo, training_args['epochs'], ' '.join([
key + ':' + '%.3f' % train_results[key]
for key in train_results
]), ' '.join([
key + ':' + '%.3f' % val_results[key] for key in val_results
])))
if epo >= 50 and early_stopping.check([val_results['AUC']], epo):
break
# restore best model
print('Loading {}th epoch'.format(early_stopping.best_epoch))
base_model.load_state_dict(early_stopping.best_state)
# validation metrics
val_pre_ratings = torch.empty(0).to(device)
val_ratings = torch.empty(0).to(device)
for batch_idx, (users, items, ratings) in enumerate(val_loader):
pre_ratings = base_model(users, items)
val_pre_ratings = torch.cat((val_pre_ratings, pre_ratings))
val_ratings = torch.cat((val_ratings, ratings))
# test metrics
test_users = torch.empty(0, dtype=torch.int64).to(device)
test_items = torch.empty(0, dtype=torch.int64).to(device)
test_pre_ratings = torch.empty(0).to(device)
test_ratings = torch.empty(0).to(device)
for batch_idx, (users, items, ratings) in enumerate(test_loader):
pre_ratings = base_model(users, items)
test_users = torch.cat((test_users, users))
test_items = torch.cat((test_items, items))
test_pre_ratings = torch.cat((test_pre_ratings, pre_ratings))
test_ratings = torch.cat((test_ratings, ratings))
val_results = utils.metrics.evaluate(val_pre_ratings, val_ratings,
['MSE', 'NLL', 'AUC'])
test_results = utils.metrics.evaluate(
test_pre_ratings,
test_ratings, ['MSE', 'NLL', 'AUC', 'Recall_Precision_NDCG@'],
users=test_users,
items=test_items)
print('-' * 30)
print('The performance of validation set: {}'.format(' '.join(
[key + ':' + '%.3f' % val_results[key] for key in val_results])))
print('The performance of testing set: {}'.format(' '.join(
[key + ':' + '%.3f' % test_results[key] for key in test_results])))
print('-' * 30)
return val_results, test_results
def train_and_eval(train_data,
unif_data,
val_data,
test_data,
device='cuda',
model_class=MF,
base_model_args: dict = {
'emb_dim': 10,
'learning_rate': 0.001,
'weight_decay': 0.0
},
teacher_model_args: dict = {
'emb_dim': 10,
'learning_rate': 0.1,
'weight_decay': 0.0
},
training_args: dict = {
'batch_size': 1024,
'epochs': 100,
'patience': 20,
'block_batch': [1000, 100]
}):
# build data_loader.
train_loader = utils.data_loader.Block(
train_data,
u_batch_size=training_args['block_batch'][0],
i_batch_size=training_args['block_batch'][1],
device=device)
unif_loader = utils.data_loader.Block(
unif_data,
u_batch_size=training_args['block_batch'][0],
i_batch_size=training_args['block_batch'][1],
device=device)
val_loader = utils.data_loader.DataLoader(
utils.data_loader.Interactions(val_data),
batch_size=training_args['batch_size'],
shuffle=False,
num_workers=0)
test_loader = utils.data_loader.DataLoader(
utils.data_loader.Interactions(test_data),
batch_size=training_args['batch_size'],
shuffle=False,
num_workers=0)
# data shape
n_user, n_item = train_data.shape
# base model and its optimizer.
base_model = MF(n_user, n_item, dim=base_model_args['emb_dim'],
dropout=0).to(device)
base_optimizer = torch.optim.SGD(base_model.parameters(),
lr=base_model_args['learning_rate'],
weight_decay=0)
# teacher model and its optimizer.
teacher_model = MF(n_user,
n_item,
dim=teacher_model_args['emb_dim'],
dropout=0).to(device)
teacher_optimizer = torch.optim.SGD(teacher_model.parameters(),
lr=teacher_model_args['learning_rate'],
weight_decay=0)
# loss_criterion
criterion = nn.MSELoss(reduction='sum')
# begin base model training
stopping_args = Stop_args(patience=training_args['patience'],
max_epochs=training_args['epochs'] // 1)
early_stopping = EarlyStopping(base_model, **stopping_args)
for epo in range(early_stopping.max_epochs):
training_loss = 0
for u_batch_idx, users in enumerate(train_loader.User_loader):
for i_batch_idx, items in enumerate(train_loader.Item_loader):
# loss of training set
base_model.train()
users_train, items_train, y_train = train_loader.get_batch(
users, items)
y_hat = base_model(users_train, items_train)
loss = criterion(
y_hat, y_train
) + base_model_args['weight_decay'] * base_model.l2_norm(
users_train, items_train)
base_optimizer.zero_grad()
loss.backward()
base_optimizer.step()
training_loss += loss.item()
base_model.eval()
with torch.no_grad():
# train metrics
train_pre_ratings = torch.empty(0).to(device)
train_ratings = torch.empty(0).to(device)
for u_batch_idx, users in enumerate(train_loader.User_loader):
for i_batch_idx, items in enumerate(train_loader.Item_loader):
users_train, items_train, y_train = train_loader.get_batch(
users, items)
pre_ratings = base_model(users_train, items_train)
train_pre_ratings = torch.cat(
(train_pre_ratings, pre_ratings))
train_ratings = torch.cat((train_ratings, y_train))
# validation metrics
val_pre_ratings = torch.empty(0).to(device)
val_ratings = torch.empty(0).to(device)
for batch_idx, (users, items, ratings) in enumerate(val_loader):
pre_ratings = base_model(users, items)
val_pre_ratings = torch.cat((val_pre_ratings, pre_ratings))
val_ratings = torch.cat((val_ratings, ratings))
train_results = utils.metrics.evaluate(train_pre_ratings,
train_ratings, ['MSE', 'NLL'])
val_results = utils.metrics.evaluate(val_pre_ratings, val_ratings,
['MSE', 'NLL', 'AUC'])
print('Epoch: {0:2d} / {1}, Traning: {2}, Validation: {3}'.format(
epo, training_args['epochs'], ' '.join([
key + ':' + '%.3f' % train_results[key]
for key in train_results
]), ' '.join([
key + ':' + '%.3f' % val_results[key] for key in val_results
])))
if early_stopping.check([val_results['AUC']], epo):
break
# testing loss
print('Loading {}th epoch'.format(early_stopping.best_epoch))
base_model.load_state_dict(early_stopping.best_state)
# validation metrics
val_pre_ratings = torch.empty(0).to(device)
val_ratings = torch.empty(0).to(device)
for batch_idx, (users, items, ratings) in enumerate(val_loader):
pre_ratings = base_model(users, items)
val_pre_ratings = torch.cat((val_pre_ratings, pre_ratings))
val_ratings = torch.cat((val_ratings, ratings))
# test metrics
test_users = torch.empty(0, dtype=torch.int64).to(device)
test_items = torch.empty(0, dtype=torch.int64).to(device)
test_pre_ratings = torch.empty(0).to(device)
test_ratings = torch.empty(0).to(device)
for batch_idx, (users, items, ratings) in enumerate(test_loader):
pre_ratings = base_model(users, items)
test_users = torch.cat((test_users, users))
test_items = torch.cat((test_items, items))
test_pre_ratings = torch.cat((test_pre_ratings, pre_ratings))
test_ratings = torch.cat((test_ratings, ratings))
val_results = utils.metrics.evaluate(val_pre_ratings, val_ratings,
['MSE', 'NLL', 'AUC'])
test_results = utils.metrics.evaluate(
test_pre_ratings,
test_ratings, ['MSE', 'NLL', 'AUC', 'Recall_Precision_NDCG@'],
users=test_users,
items=test_items)
print('-' * 30)
print('The performance of validation set: {}'.format(' '.join(
[key + ':' + '%.3f' % val_results[key] for key in val_results])))
print('The performance of testing set: {}'.format(' '.join(
[key + ':' + '%.3f' % test_results[key] for key in test_results])))
print('-' * 30)
# begin teacher model training
stopping_args = Stop_args(patience=training_args['patience'],
max_epochs=training_args['epochs'] // 1)
early_stopping = EarlyStopping(teacher_model, **stopping_args)
for epo in range(early_stopping.max_epochs):
training_loss = 0
for u_batch_idx, users in enumerate(unif_loader.User_loader):
for i_batch_idx, items in enumerate(unif_loader.Item_loader):
# loss of training set
teacher_model.train()
users_train, items_train, y_train = unif_loader.get_batch(
users, items)
y_hat = teacher_model(users_train, items_train)
loss = criterion(
y_hat, y_train
) + teacher_model_args['weight_decay'] * teacher_model.l2_norm(
users_train, items_train)
teacher_optimizer.zero_grad()
loss.backward()
teacher_optimizer.step()
training_loss += loss.item()
teacher_model.eval()
with torch.no_grad():
# train metrics
train_pre_ratings = torch.empty(0).to(device)
train_ratings = torch.empty(0).to(device)
for u_batch_idx, users in enumerate(unif_loader.User_loader):
for i_batch_idx, items in enumerate(unif_loader.Item_loader):
users_train, items_train, y_train = unif_loader.get_batch(
users, items)
pre_ratings = teacher_model(users_train, items_train)
train_pre_ratings = torch.cat(
(train_pre_ratings, pre_ratings))
train_ratings = torch.cat((train_ratings, y_train))
# validation metrics
val_pre_ratings = torch.empty(0).to(device)
val_ratings = torch.empty(0).to(device)
for batch_idx, (users, items, ratings) in enumerate(val_loader):
pre_ratings = teacher_model(users, items)
val_pre_ratings = torch.cat((val_pre_ratings, pre_ratings))
val_ratings = torch.cat((val_ratings, ratings))
train_results = utils.metrics.evaluate(train_pre_ratings,
train_ratings, ['MSE', 'NLL'])
val_results = utils.metrics.evaluate(val_pre_ratings, val_ratings,
['MSE', 'NLL', 'AUC'])
print('Epoch: {0:2d} / {1}, Traning: {2}, Validation: {3}'.format(
epo, training_args['epochs'], ' '.join([
key + ':' + '%.3f' % train_results[key]
for key in train_results
]), ' '.join([
key + ':' + '%.3f' % val_results[key] for key in val_results
])))
if early_stopping.check([val_results['AUC']], epo):
break
# testing loss
print('Loading {}th epoch'.format(early_stopping.best_epoch))
teacher_model.load_state_dict(early_stopping.best_state)
# validation metrics
val_pre_ratings = torch.empty(0).to(device)
val_ratings = torch.empty(0).to(device)
for batch_idx, (users, items, ratings) in enumerate(val_loader):
pre_ratings = teacher_model(users, items)
val_pre_ratings = torch.cat((val_pre_ratings, pre_ratings))
val_ratings = torch.cat((val_ratings, ratings))
# test metrics
test_users = torch.empty(0, dtype=torch.int64).to(device)
test_items = torch.empty(0, dtype=torch.int64).to(device)
test_pre_ratings = torch.empty(0).to(device)
test_ratings = torch.empty(0).to(device)
for batch_idx, (users, items, ratings) in enumerate(test_loader):
pre_ratings = teacher_model(users, items)
test_users = torch.cat((test_users, users))
test_items = torch.cat((test_items, items))
test_pre_ratings = torch.cat((test_pre_ratings, pre_ratings))
test_ratings = torch.cat((test_ratings, ratings))
val_results = utils.metrics.evaluate(val_pre_ratings, val_ratings,
['MSE', 'NLL', 'AUC'])
test_results = utils.metrics.evaluate(
test_pre_ratings,
test_ratings, ['MSE', 'NLL', 'AUC', 'Recall_Precision_NDCG@'],
users=test_users,
items=test_items)
print('-' * 30)
print('The performance of validation set: {}'.format(' '.join(
[key + ':' + '%.3f' % val_results[key] for key in val_results])))
print('The performance of testing set: {}'.format(' '.join(
[key + ':' + '%.3f' % test_results[key] for key in test_results])))
print('-' * 30)
# base model re-tune
stopping_args = Stop_args(patience=training_args['patience'],
max_epochs=training_args['epochs'] // 1)
early_stopping = EarlyStopping(base_model, **stopping_args)
for epo in range(early_stopping.max_epochs):
training_loss = 0
for u_batch_idx, users in enumerate(train_loader.User_loader):
for i_batch_idx, items in enumerate(train_loader.Item_loader):
# loss of training set
base_model.train()
users_train, items_train, y_train = train_loader.get_batch(
users, items)
y_hat = base_model(users_train, items_train)
y_res = teacher_model(users_train, items_train)
y_res = (y_res - torch.min(y_res)) / (torch.max(y_res) -
torch.min(y_res))
y_train = y_train + y_res
loss = criterion(
y_hat, y_train
) + base_model_args['weight_decay'] * base_model.l2_norm(
users_train, items_train)
base_optimizer.zero_grad()
loss.backward()
base_optimizer.step()
training_loss += loss.item()
base_model.eval()
with torch.no_grad():
# train metrics
train_pre_ratings = torch.empty(0).to(device)
train_ratings = torch.empty(0).to(device)
for u_batch_idx, users in enumerate(train_loader.User_loader):
for i_batch_idx, items in enumerate(train_loader.Item_loader):
users_train, items_train, y_train = train_loader.get_batch(
users, items)
pre_ratings = base_model(users_train, items_train)
train_pre_ratings = torch.cat(
(train_pre_ratings, pre_ratings))
train_ratings = torch.cat((train_ratings, y_train))
# validation metrics
val_pre_ratings = torch.empty(0).to(device)
val_ratings = torch.empty(0).to(device)
for batch_idx, (users, items, ratings) in enumerate(val_loader):
pre_ratings = base_model(users, items)
val_pre_ratings = torch.cat((val_pre_ratings, pre_ratings))
val_ratings = torch.cat((val_ratings, ratings))
train_results = utils.metrics.evaluate(train_pre_ratings,
train_ratings, ['MSE', 'NLL'])
val_results = utils.metrics.evaluate(val_pre_ratings, val_ratings,
['MSE', 'NLL', 'AUC'])
print('Epoch: {0:2d} / {1}, Traning: {2}, Validation: {3}'.format(
epo, training_args['epochs'], ' '.join([
key + ':' + '%.3f' % train_results[key]
for key in train_results
]), ' '.join([
key + ':' + '%.3f' % val_results[key] for key in val_results
])))
if early_stopping.check([val_results['AUC']], epo):
break
# testing loss
print('Loading {}th epoch'.format(early_stopping.best_epoch))
base_model.load_state_dict(early_stopping.best_state)
# validation metrics
val_pre_ratings = torch.empty(0).to(device)
val_ratings = torch.empty(0).to(device)
for batch_idx, (users, items, ratings) in enumerate(val_loader):
pre_ratings = base_model(users, items)
val_pre_ratings = torch.cat((val_pre_ratings, pre_ratings))
val_ratings = torch.cat((val_ratings, ratings))
# test metrics
test_users = torch.empty(0, dtype=torch.int64).to(device)
test_items = torch.empty(0, dtype=torch.int64).to(device)
test_pre_ratings = torch.empty(0).to(device)
test_ratings = torch.empty(0).to(device)
for batch_idx, (users, items, ratings) in enumerate(test_loader):
pre_ratings = base_model(users, items)
test_users = torch.cat((test_users, users))
test_items = torch.cat((test_items, items))
test_pre_ratings = torch.cat((test_pre_ratings, pre_ratings))
test_ratings = torch.cat((test_ratings, ratings))
val_results = utils.metrics.evaluate(val_pre_ratings, val_ratings,
['MSE', 'NLL', 'AUC'])
test_results = utils.metrics.evaluate(
test_pre_ratings,
test_ratings, ['MSE', 'NLL', 'AUC', 'Recall_Precision_NDCG@'],
users=test_users,
items=test_items)
print('-' * 30)
print('The performance of validation set: {}'.format(' '.join(
[key + ':' + '%.3f' % val_results[key] for key in val_results])))
print('The performance of testing set: {}'.format(' '.join(
[key + ':' + '%.3f' % test_results[key] for key in test_results])))
print('-' * 30)
return val_results, test_results
def train_and_eval(train_data, unif_train_data, val_data, test_data, device = 'cuda',
base_model_args: dict = {'emb_dim': 64, 'learning_rate': 0.01, 'weight_decay': 0.1},
imputation_model_args: dict = {'emb_dim': 10, 'learning_rate': 0.1, 'weight_decay': 0.1},
training_args: dict = {'batch_size': 1024, 'epochs': 100, 'patience': 20, 'block_batch': [1000, 100]}):
# double robust model
# build data_loader.
train_loader = utils.data_loader.Block(train_data, u_batch_size=training_args['block_batch'][0], i_batch_size=training_args['block_batch'][1], device=device)
val_loader = utils.data_loader.DataLoader(utils.data_loader.Interactions(val_data), batch_size=training_args['batch_size'], shuffle=False, num_workers=0)
test_loader = utils.data_loader.DataLoader(utils.data_loader.Interactions(test_data), batch_size=training_args['batch_size'], shuffle=False, num_workers=0)
# Naive Bayes propensity Estimator
def Naive_Bayes_Propensity(train, unif):
# the implementation of naive bayes propensity
P_Oeq1 = train._nnz() / (train.size()[0] * train.size()[1])
y_unique = torch.unique(train._values())
P_y_givenO = torch.zeros(y_unique.shape).to(device)
P_y = torch.zeros(y_unique.shape).to(device)
for i in range(len(y_unique)):
P_y_givenO[i] = torch.sum(train._values() == y_unique[i]) / torch.sum(torch.ones(train._values().shape).to(device))
P_y[i] = torch.sum(unif._values() == y_unique[i]) / torch.sum(torch.ones(unif._values().shape).to(device))
Propensity = P_y_givenO / P_y * P_Oeq1
return y_unique, Propensity
y_unique, Propensity = Naive_Bayes_Propensity(train_data, unif_train_data)
InvP = torch.reciprocal(Propensity)
# data shape
n_user, n_item = train_data.shape
# model and its optimizer.
base_model = MF(n_user, n_item, dim=base_model_args['emb_dim'], dropout=0).to(device)
base_optimizer = torch.optim.SGD(base_model.parameters(), lr=base_model_args['learning_rate'], weight_decay=0)
imputation_model = MF(n_user, n_item, dim=imputation_model_args['emb_dim'], dropout=0).to(device)
imputation_optimizer = torch.optim.SGD(imputation_model.parameters(), lr=imputation_model_args['learning_rate'], weight_decay=0)
# loss_criterion
none_criterion = nn.MSELoss(reduction='none')
sum_criterion = nn.MSELoss(reduction='sum')
# begin training
stopping_args = Stop_args(patience=training_args['patience'], max_epochs=training_args['epochs'])
early_stopping = EarlyStopping(base_model, **stopping_args)
for epo in range(early_stopping.max_epochs):
for u_batch_idx, users in enumerate(train_loader.User_loader):
for i_batch_idx, items in enumerate(train_loader.Item_loader):
# observation data in this batch
users_train, items_train, y_train = train_loader.get_batch(users, items)
weight = torch.ones(y_train.shape).to(device)
for i in range(len(y_unique)):
weight[y_train == y_unique[i]] = InvP[i]
# step 1: update imptation error model
imputation_model.train()
e_hat = imputation_model(users_train, items_train) # imputation error
e = y_train - base_model(users_train, items_train) # prediction error
cost_e = none_criterion(e_hat, e) # the cost of error, i.e., the difference between imputaiton error and prediction error
loss_imp = torch.sum(weight * cost_e) + imputation_model_args['weight_decay'] * imputation_model.l2_norm(users_train, items_train)
imputation_optimizer.zero_grad()
loss_imp.backward()
imputation_optimizer.step()
# step 2: update predition model
base_model.train()
# all pair data in this block
all_pair = torch.cartesian_prod(users, items)
users_all, items_all = all_pair[:,0], all_pair[:,1]
y_hat_all = base_model(users_all, items_all)
y_hat_all_detach = torch.detach(y_hat_all)
g_all = imputation_model(users_all, items_all)
loss_all = sum_criterion(y_hat_all, g_all + y_hat_all_detach) # sum(e_hat)
# observation data
y_hat_obs = base_model(users_train, items_train)
y_hat_obs_detach = torch.detach(y_hat_obs)
g_obs = imputation_model(users_train, items_train)
e_obs = none_criterion(y_hat_obs, y_train)
e_hat_obs = none_criterion(y_hat_obs, g_obs + y_hat_obs_detach)
cost_obs = e_obs - e_hat_obs
loss_obs = torch.sum(weight * cost_obs)
loss_base = loss_all + loss_obs + base_model_args['weight_decay'] * base_model.l2_norm(users_all, items_all)
base_optimizer.zero_grad()
loss_base.backward()
base_optimizer.step()
base_model.eval()
with torch.no_grad():
# training metrics
train_pre_ratings = torch.empty(0).to(device)
train_ratings = torch.empty(0).to(device)
for u_batch_idx, users in enumerate(train_loader.User_loader):
for i_batch_idx, items in enumerate(train_loader.Item_loader):
users_train, items_train, y_train = train_loader.get_batch(users, items)
pre_ratings = base_model(users_train, items_train)
train_pre_ratings = torch.cat((train_pre_ratings, pre_ratings))
train_ratings = torch.cat((train_ratings, y_train))
# validation metrics
val_pre_ratings = torch.empty(0).to(device)
val_ratings = torch.empty(0).to(device)
for batch_idx, (users, items, ratings) in enumerate(val_loader):
pre_ratings = base_model(users, items)
val_pre_ratings = torch.cat((val_pre_ratings, pre_ratings))
val_ratings = torch.cat((val_ratings, ratings))
train_results = utils.metrics.evaluate(train_pre_ratings, train_ratings, ['MSE', 'NLL'])
val_results = utils.metrics.evaluate(val_pre_ratings, val_ratings, ['MSE', 'NLL', 'AUC'])
print('Epoch: {0:2d} / {1}, Traning: {2}, Validation: {3}'.
format(epo, training_args['epochs'], ' '.join([key+':'+'%.3f'%train_results[key] for key in train_results]),
' '.join([key+':'+'%.3f'%val_results[key] for key in val_results])))
if early_stopping.check([val_results['AUC']], epo):
break
# testing loss
print('Loading {}th epoch'.format(early_stopping.best_epoch))
base_model.load_state_dict(early_stopping.best_state)
# validation metrics
val_pre_ratings = torch.empty(0).to(device)
val_ratings = torch.empty(0).to(device)
for batch_idx, (users, items, ratings) in enumerate(val_loader):
pre_ratings = base_model(users, items)
val_pre_ratings = torch.cat((val_pre_ratings, pre_ratings))
val_ratings = torch.cat((val_ratings, ratings))
# test metrics
test_users = torch.empty(0, dtype=torch.int64).to(device)
test_items = torch.empty(0, dtype=torch.int64).to(device)
test_pre_ratings = torch.empty(0).to(device)
test_ratings = torch.empty(0).to(device)
for batch_idx, (users, items, ratings) in enumerate(test_loader):
pre_ratings = base_model(users, items)
test_users = torch.cat((test_users, users))
test_items = torch.cat((test_items, items))
test_pre_ratings = torch.cat((test_pre_ratings, pre_ratings))
test_ratings = torch.cat((test_ratings, ratings))
val_results = utils.metrics.evaluate(val_pre_ratings, val_ratings, ['MSE', 'NLL', 'AUC'])
test_results = utils.metrics.evaluate(test_pre_ratings, test_ratings, ['MSE', 'NLL', 'AUC', 'Recall_Precision_NDCG@'], users=test_users, items=test_items)
print('-'*30)
print('The performance of validation set: {}'.format(' '.join([key+':'+'%.3f'%val_results[key] for key in val_results])))
print('The performance of testing set: {}'.format(' '.join([key+':'+'%.3f'%test_results[key] for key in test_results])))
print('-'*30)
return val_results,test_results
def train_and_eval(train_data,
val_data,
test_data,
device='cuda',
model_class=MF,
base_model_args: dict = {
'emb_dim': 64,
'learning_rate': 0.05,
'weight_decay': 0.05
},
position_model_args: dict = {
'learning_rate': 0.05,
'weight_decay': 0.05
},
training_args: dict = {
'batch_size': 1024,
'epochs': 100,
'patience': 20,
'block_batch': [1000, 100]
}):
train_position = train_data['position']
train_rating = train_data['rating']
# build data_loader.
train_loader = utils.data_loader.User(
train_position,
train_rating,
u_batch_size=training_args['block_batch'][0],
device=device)
val_loader = utils.data_loader.DataLoader(
utils.data_loader.Interactions(val_data),
batch_size=training_args['batch_size'],
shuffle=False,
num_workers=0)
test_loader = utils.data_loader.DataLoader(
utils.data_loader.Interactions(test_data),
batch_size=training_args['batch_size'],
shuffle=False,
num_workers=0)
n_user, n_item = train_position.shape
n_position = torch.max(train_position._values()).item() + 1
criterion = nn.MSELoss(reduction='sum')
# train Heckman model
heckman_model = MF(n_user, n_item,
dim=base_model_args['emb_dim']).to(device)
heckman_optimizer = torch.optim.SGD(heckman_model.parameters(),
lr=base_model_args['learning_rate'],
weight_decay=0)
stopping_args = Stop_args(patience=training_args['patience'],
max_epochs=training_args['epochs'])
early_stopping = EarlyStopping(heckman_model, **stopping_args)
for epo in range(early_stopping.max_epochs):
training_loss = 0
for u_batch_idx, users in enumerate(train_loader.User_loader):
heckman_model.train()
# observation data in this batch
users_train, items_train, positions_train, y_train = train_loader.get_batch(
users)
y_hat_obs = heckman_model(users_train, items_train)
loss_obs = torch.sum((y_hat_obs - 1)**2)
all_pair = torch.cartesian_prod(users,
torch.arange(n_item).to(device))
users_all, items_all = all_pair[:, 0], all_pair[:, 1]
y_hat_all = heckman_model(users_all, items_all)
loss_all = torch.sum((y_hat_all + 1)**2)
loss = loss_obs + base_model_args[
'imputaion_lambda'] * loss_all # + 0.000 * heckman_model.l2_norm(users_all, items_all)
heckman_optimizer.zero_grad()
loss.backward()
heckman_optimizer.step()
training_loss += loss.item()
# print('Epoch: {0:2d} / {1}, Traning: {2}'.
# format(epo, training_args['epochs'], training_loss))
if early_stopping.check([-training_loss], epo):
break
print('Loading {}th epoch for heckman model'.format(
early_stopping.best_epoch))
heckman_model.load_state_dict(early_stopping.best_state)
heckman_model.eval()
# train click model
click_model = MF_heckman(n_user, n_item,
dim=base_model_args['emb_dim']).to(device)
click_optimizer = torch.optim.SGD(click_model.parameters(),
lr=base_model_args['learning_rate'],
weight_decay=0)
stopping_args = Stop_args(patience=training_args['patience'],
max_epochs=training_args['epochs'])
early_stopping = EarlyStopping(click_model, **stopping_args)
for epo in range(early_stopping.max_epochs):
training_loss = 0
for u_batch_idx, users in enumerate(train_loader.User_loader):
click_model.train()
# observation data in this batch
users_train, items_train, positions_train, y_train = train_loader.get_batch(
users)
heckman_train = heckman_model(users_train, items_train)
lam_train = (2 * math.pi)**(-0.5) * torch.exp(
-heckman_train**2 / 2) / torch.sigmoid(1.7 * heckman_train)
y_hat = click_model(users_train, items_train, lam_train)
loss = criterion(y_hat, y_train) + base_model_args[
'weight_decay'] * click_model.l2_norm(users_train, items_train)
click_optimizer.zero_grad()
loss.backward()
click_optimizer.step()
training_loss += loss.item()
click_model.eval()
with torch.no_grad():
# training metrics
train_pre_ratings = torch.empty(0).to(device)
train_ratings = torch.empty(0).to(device)
for u_batch_idx, users in enumerate(train_loader.User_loader):
users_train, items_train, positions_train, y_train = train_loader.get_batch(
users)
heckman_train = heckman_model(users_train, items_train)
lams = (2 * math.pi)**(-0.5) * torch.exp(
-heckman_train**2 / 2) / torch.sigmoid(1.7 * heckman_train)
pre_ratings = click_model(users_train, items_train, lams)
train_pre_ratings = torch.cat((train_pre_ratings, pre_ratings))
train_ratings = torch.cat((train_ratings, y_train))
# validation metrics
val_pre_ratings = torch.empty(0).to(device)
val_ratings = torch.empty(0).to(device)
for batch_idx, (users, items, ratings) in enumerate(val_loader):
heckman_train = heckman_model(users, items)
lams = (2 * math.pi)**(-0.5) * torch.exp(
-heckman_train**2 / 2) / torch.sigmoid(1.7 * heckman_train)
pre_ratings = click_model(users, items, lams)
val_pre_ratings = torch.cat((val_pre_ratings, pre_ratings))
val_ratings = torch.cat((val_ratings, ratings))
train_results = utils.metrics.evaluate(train_pre_ratings,
train_ratings, ['MSE', 'NLL'])
val_results = utils.metrics.evaluate(val_pre_ratings, val_ratings,
['MSE', 'NLL', 'AUC'])
print('Epoch: {0:2d} / {1}, Traning: {2}, Validation: {3}'.format(
epo, training_args['epochs'], ' '.join([
key + ':' + '%.3f' % train_results[key]
for key in train_results
]), ' '.join([
key + ':' + '%.3f' % val_results[key] for key in val_results
])))
if early_stopping.check([val_results['AUC']], epo):
break
print('Loading {}th epoch for click model'.format(
early_stopping.best_epoch))
click_model.load_state_dict(early_stopping.best_state)
# validation metrics
val_pre_ratings_1 = torch.empty(0).to(device)
val_ratings_1 = torch.empty(0).to(device)
for batch_idx, (users, items, ratings) in enumerate(val_loader):
heckman_train = heckman_model(users, items)
lams = (2 * math.pi)**(-0.5) * torch.exp(
-heckman_train**2 / 2) / torch.sigmoid(1.7 * heckman_train)
pre_ratings = click_model(users, items, lams)
val_pre_ratings_1 = torch.cat((val_pre_ratings_1, pre_ratings))
val_ratings_1 = torch.cat((val_ratings_1, ratings))
# test metrics
test_users_1 = torch.empty(0, dtype=torch.int64).to(device)
test_items_1 = torch.empty(0, dtype=torch.int64).to(device)
test_pre_ratings_1 = torch.empty(0).to(device)
test_ratings_1 = torch.empty(0).to(device)
for batch_idx, (users, items, ratings) in enumerate(test_loader):
heckman_train = heckman_model(users, items)
lams = (2 * math.pi)**(-0.5) * torch.exp(
-heckman_train**2 / 2) / torch.sigmoid(1.7 * heckman_train)
pre_ratings = click_model(users, items, lams)
test_users_1 = torch.cat((test_users_1, users))
test_items_1 = torch.cat((test_items_1, items))
test_pre_ratings_1 = torch.cat((test_pre_ratings_1, pre_ratings))
test_ratings_1 = torch.cat((test_ratings_1, ratings))
val_results_1 = utils.metrics.evaluate(val_pre_ratings_1, val_ratings_1,
['MSE', 'NLL', 'AUC'])
test_results_1 = utils.metrics.evaluate(
test_pre_ratings_1,
test_ratings_1, ['MSE', 'NLL', 'AUC', 'Recall_Precision_NDCG@'],
users=test_users_1,
items=test_items_1)
print('-' * 30)
print('The performance of validation set: {}'.format(' '.join(
[key + ':' + '%.3f' % val_results_1[key] for key in val_results_1])))
print('The performance of testing set: {}'.format(' '.join(
[key + ':' + '%.3f' % test_results_1[key] for key in test_results_1])))
print('-' * 30)
# train position model (DLA)
base_model = MF(n_user, n_item, dim=base_model_args['emb_dim']).to(device)
base_optimizer = torch.optim.SGD(base_model.parameters(),
lr=base_model_args['learning_rate'],
weight_decay=0)
position_model = Position(n_position).to(device)
position_optimizer = torch.optim.SGD(
position_model.parameters(),
lr=position_model_args['learning_rate'],
weight_decay=0)
# begin training
stopping_args = Stop_args(patience=training_args['patience'],
max_epochs=training_args['epochs'])
early_stopping = EarlyStopping(base_model, **stopping_args)
none_criterion = nn.MSELoss(reduction='none')
for epo in range(early_stopping.max_epochs):
for u_batch_idx, users in enumerate(train_loader.User_loader):
base_model.train()
position_model.train()
# observation data in this batch
users_train, items_train, positions_train, y_train = train_loader.get_batch(
users)
first_index_row = torch.where(
positions_train == 0)[0] // n_position
first_index_col = torch.where(positions_train == 0)[0] % n_position
y_hat = base_model(users_train, items_train)
p_hat = position_model(positions_train)
# users_train = users_train.view(-1, n_position)
# items_train = items_train.view(-1, n_position)
# positions_train = positions_train.view(-1, n_position)
y_train = y_train.view(-1, n_position)
y_hat = y_hat.view(-1, n_position)
p_hat = p_hat.view(-1, n_position)
y_hat_som = torch.softmax(y_hat, dim=-1) # softmax
p_hat_som = torch.softmax(p_hat, dim=-1)
IRW = torch.detach(
y_hat_som[first_index_row, first_index_col].unsqueeze(dim=-1) *
torch.reciprocal(y_hat_som))
IPW = torch.detach(
p_hat_som[first_index_row, first_index_col].unsqueeze(dim=-1) *
torch.reciprocal(p_hat_som))
cost_base = none_criterion(y_hat, y_train)
# IPW = torch.ones(IPW.shape).to(device)
loss_IPW = torch.sum(IPW * cost_base) + 5 * base_model_args[
'weight_decay'] * base_model.l2_norm(users_train, items_train)
cost_position = none_criterion(p_hat, y_train)
loss_IRW = torch.sum(IRW * cost_position) + position_model_args[
'weight_decay'] * position_model.l2_norm(positions_train)
# y_train = y_train == 1
# loss_IRW = - torch.sum(y_train * IRW * torch.log(p_hat_som)) + position_model_args['weight_decay'] * position_model.l2_norm(positions_train)
# loss_IPW = - torch.sum(y_train * IPW * torch.log(y_hat_som)) + base_model_args['weight_decay'] * base_model.l2_norm(users_train, items_train)
base_optimizer.zero_grad()
loss_IPW.backward()
base_optimizer.step()
position_optimizer.zero_grad()
loss_IRW.backward()
position_optimizer.step()
base_model.eval()
with torch.no_grad():
# training metrics
train_pre_ratings = torch.empty(0).to(device)
train_ratings = torch.empty(0).to(device)
for u_batch_idx, users in enumerate(train_loader.User_loader):
users_train, items_train, positions_train, y_train = train_loader.get_batch(
users)
pre_ratings = base_model(users_train, items_train)
train_pre_ratings = torch.cat((train_pre_ratings, pre_ratings))
train_ratings = torch.cat((train_ratings, y_train))
# validation metrics
val_pre_ratings = torch.empty(0).to(device)
val_ratings = torch.empty(0).to(device)
for batch_idx, (users, items, ratings) in enumerate(val_loader):
pre_ratings = base_model(users, items)
val_pre_ratings = torch.cat((val_pre_ratings, pre_ratings))
val_ratings = torch.cat((val_ratings, ratings))
train_results = utils.metrics.evaluate(train_pre_ratings,
train_ratings, ['MSE', 'NLL'])
val_results = utils.metrics.evaluate(val_pre_ratings, val_ratings,
['MSE', 'NLL', 'AUC'])
print('Epoch: {0:2d} / {1}, Traning: {2}, Validation: {3}'.format(
epo, training_args['epochs'], ' '.join([
key + ':' + '%.3f' % train_results[key]
for key in train_results
]), ' '.join([
key + ':' + '%.3f' % val_results[key] for key in val_results
])))
if early_stopping.check([val_results['AUC']], epo):
break
# testing loss
print('Loading {}th epoch'.format(early_stopping.best_epoch))
base_model.load_state_dict(early_stopping.best_state)
# validation metrics
val_pre_ratings_2 = torch.empty(0).to(device)
val_ratings_2 = torch.empty(0).to(device)
for batch_idx, (users, items, ratings) in enumerate(val_loader):
pre_ratings = base_model(users, items)
val_pre_ratings_2 = torch.cat((val_pre_ratings_2, pre_ratings))
val_ratings_2 = torch.cat((val_ratings_2, ratings))
# test metrics
test_users_2 = torch.empty(0, dtype=torch.int64).to(device)
test_items_2 = torch.empty(0, dtype=torch.int64).to(device)
test_pre_ratings_2 = torch.empty(0).to(device)
test_ratings_2 = torch.empty(0).to(device)
for batch_idx, (users, items, ratings) in enumerate(test_loader):
pre_ratings = base_model(users, items)
test_users_2 = torch.cat((test_users_2, users))
test_items_2 = torch.cat((test_items_2, items))
test_pre_ratings_2 = torch.cat((test_pre_ratings_2, pre_ratings))
test_ratings_2 = torch.cat((test_ratings_2, ratings))
val_results_2 = utils.metrics.evaluate(val_pre_ratings_2, val_ratings_2,
['MSE', 'NLL', 'AUC'])
test_results_2 = utils.metrics.evaluate(
test_pre_ratings_2,
test_ratings_2, ['MSE', 'NLL', 'AUC', 'Recall_Precision_NDCG@'],
users=test_users_2,
items=test_items_2)
print('-' * 30)
print('The performance of validation set: {}'.format(' '.join(
[key + ':' + '%.3f' % val_results_2[key] for key in val_results_2])))
print('The performance of testing set: {}'.format(' '.join(
[key + ':' + '%.3f' % test_results_2[key] for key in test_results_2])))
print('-' * 30)
alp = 0.4
val_ratings = val_ratings_1
val_pre_ratings = alp * val_pre_ratings_1 + (1 - alp) * val_pre_ratings_2
test_users = test_users_1
test_items = test_items_1
test_ratings = test_ratings_1
test_pre_ratings = alp * test_pre_ratings_1 + (1 -
alp) * test_pre_ratings_2
val_results = utils.metrics.evaluate(val_pre_ratings, val_ratings,
['MSE', 'NLL', 'AUC'])
test_results = utils.metrics.evaluate(
test_pre_ratings,
test_ratings, ['MSE', 'NLL', 'AUC', 'Recall_Precision_NDCG@'],
users=test_users,
items=test_items)
print('-' * 30)
print('The performance of validation set: {}'.format(' '.join(
[key + ':' + '%.3f' % val_results[key] for key in val_results])))
print('The performance of testing set: {}'.format(' '.join(
[key + ':' + '%.3f' % test_results[key] for key in test_results])))
print('-' * 30)
return val_results, test_results