def forward(self, p, q, pad_mask=None):
"""
Args:
p(obj:`Tensor`): the first forward logits of training examples.
q(obj:`Tensor`): the second forward logits of training examples.
pad_mask(obj:`Tensor`, optional): The Tensor containing the binary mask to index with, it's data type is bool.
Returns:
loss(obj:`Tensor`): the rdrop loss of p and q
"""
p_loss = F.kl_div(F.log_softmax(p, axis=-1),
F.softmax(q, axis=-1),
reduction=self.reduction)
q_loss = F.kl_div(F.log_softmax(q, axis=-1),
F.softmax(p, axis=-1),
reduction=self.reduction)
# pad_mask is for seq-level tasks
if pad_mask is not None:
p_loss = paddle.masked_select(p_loss, pad_mask)
q_loss = paddle.masked_select(q_loss, pad_mask)
# You can choose whether to use function "sum" and "mean" depending on your task
p_loss = p_loss.sum()
q_loss = q_loss.sum()
loss = (p_loss + q_loss) / 2
return loss
def batch_predict(
model,
data_loader,
rel_vocab,
word_pad_index,
word_bos_index,
word_eos_index,
):
model.eval()
arcs, rels = [], []
for inputs in data_loader():
if args.encoding_model.startswith("ernie") or args.encoding_model == "lstm-pe":
words = inputs[0]
words, feats = flat_words(words)
s_arc, s_rel, words = model(words, feats)
else:
words, feats = inputs
s_arc, s_rel, words = model(words, feats)
mask = paddle.logical_and(
paddle.logical_and(words != word_pad_index, words != word_bos_index),
words != word_eos_index,
)
lens = paddle.sum(paddle.cast(mask, "int32"), axis=-1)
arc_preds, rel_preds = decode(s_arc, s_rel, mask)
arcs.extend(paddle.split(paddle.masked_select(arc_preds, mask), lens.numpy().tolist()))
rels.extend(paddle.split(paddle.masked_select(rel_preds, mask), lens.numpy().tolist()))
arcs = [[str(s) for s in seq.numpy().tolist()] for seq in arcs]
rels = [rel_vocab.to_tokens(seq.numpy().tolist()) for seq in rels]
return arcs, rels
def forward(self, input, target):
"""
Args:
inputs: feature matrix with shape (batch_size, feat_dim)
target: ground truth labels with shape (num_classes)
"""
inputs = input["features"]
if self.normalize_feature:
inputs = 1. * inputs / (paddle.expand_as(
paddle.norm(inputs, p=2, axis=-1, keepdim=True), inputs) +
1e-12)
bs = inputs.shape[0]
# compute distance
dist = paddle.pow(inputs, 2).sum(axis=1, keepdim=True).expand([bs, bs])
dist = dist + dist.t()
dist = paddle.addmm(input=dist,
x=inputs,
y=inputs.t(),
alpha=-2.0,
beta=1.0)
dist = paddle.clip(dist, min=1e-12).sqrt()
# hard negative mining
is_pos = paddle.expand(target, (bs, bs)).equal(
paddle.expand(target, (bs, bs)).t())
is_neg = paddle.expand(target, (bs, bs)).not_equal(
paddle.expand(target, (bs, bs)).t())
# `dist_ap` means distance(anchor, positive)
## both `dist_ap` and `relative_p_inds` with shape [N, 1]
'''
dist_ap, relative_p_inds = paddle.max(
paddle.reshape(dist[is_pos], (bs, -1)), axis=1, keepdim=True)
# `dist_an` means distance(anchor, negative)
# both `dist_an` and `relative_n_inds` with shape [N, 1]
dist_an, relative_n_inds = paddle.min(
paddle.reshape(dist[is_neg], (bs, -1)), axis=1, keepdim=True)
'''
dist_ap = paddle.max(paddle.reshape(paddle.masked_select(dist, is_pos),
(bs, -1)),
axis=1,
keepdim=True)
# `dist_an` means distance(anchor, negative)
# both `dist_an` and `relative_n_inds` with shape [N, 1]
dist_an = paddle.min(paddle.reshape(paddle.masked_select(dist, is_neg),
(bs, -1)),
axis=1,
keepdim=True)
# shape [N]
dist_ap = paddle.squeeze(dist_ap, axis=1)
dist_an = paddle.squeeze(dist_an, axis=1)
# Compute ranking hinge loss
y = paddle.ones_like(dist_an)
loss = self.ranking_loss(dist_an, dist_ap, y)
return {"TripletLossV2": loss}
def create_loss(self, prediction, mask):
loss_fct = paddle.nn.BCEWithLogitsLoss()
pos_logits, neg_logits = prediction
pos_labels, neg_labels = paddle.ones_like(
pos_logits), paddle.zeros_like(neg_logits)
loss = loss_fct(paddle.masked_select(pos_logits, mask),
paddle.masked_select(pos_labels, mask))
loss += loss_fct(paddle.masked_select(neg_logits, mask),
paddle.masked_select(neg_labels, mask))
return loss
def get_mc_loss(self, feat, inputs):
# feat.shape = [bs, ch_emb, h, w]
assert 'cls_id_map' in inputs and 'cls_tr_ids' in inputs
index = inputs['index']
mask = inputs['index_mask']
cls_id_map = inputs['cls_id_map'] # [bs, h, w]
cls_tr_ids = inputs['cls_tr_ids'] # [bs, num_classes, h, w]
feat = paddle.transpose(feat, perm=[0, 2, 3, 1])
feat_n, feat_h, feat_w, feat_c = feat.shape
feat = paddle.reshape(feat, shape=[feat_n, -1, feat_c])
index = paddle.unsqueeze(index, 2)
batch_inds = list()
for i in range(feat_n):
batch_ind = paddle.full(
shape=[1, index.shape[1], 1], fill_value=i, dtype='int64')
batch_inds.append(batch_ind)
batch_inds = paddle.concat(batch_inds, axis=0)
index = paddle.concat(x=[batch_inds, index], axis=2)
feat = paddle.gather_nd(feat, index=index)
mask = paddle.unsqueeze(mask, axis=2)
mask = paddle.expand_as(mask, feat)
mask.stop_gradient = True
feat = paddle.masked_select(feat, mask > 0)
feat = paddle.reshape(feat, shape=[-1, feat_c])
reid_losses = 0
for cls_id, id_num in self.num_identities_dict.items():
# target
cur_cls_tr_ids = paddle.reshape(
cls_tr_ids[:, cls_id, :, :], shape=[feat_n, -1]) # [bs, h*w]
cls_id_target = paddle.gather_nd(cur_cls_tr_ids, index=index)
mask = inputs['index_mask']
cls_id_target = paddle.masked_select(cls_id_target, mask > 0)
cls_id_target.stop_gradient = True
# feat
cls_id_feat = self.emb_scale_dict[str(cls_id)] * F.normalize(feat)
cls_id_pred = self.classifiers[str(cls_id)](cls_id_feat)
loss = self.reid_loss(cls_id_pred, cls_id_target)
valid = (cls_id_target != self.reid_loss.ignore_index)
valid.stop_gradient = True
count = paddle.sum((paddle.cast(valid, dtype=np.int32)))
count.stop_gradient = True
if count > 0:
loss = loss / count
reid_losses += loss
return reid_losses
def forward(self, node_repr, bond_length_index, bond_length, mask):
node_i, node_j = bond_length_index
node_i_repr = paddle.index_select(node_repr, node_i)
node_j_repr = paddle.index_select(node_repr, node_j)
node_ij_repr = paddle.concat([node_i_repr, node_j_repr], 1)
bond_length_pred = self.bond_length_pred_linear(node_ij_repr)
bond_length_pred = paddle.masked_select(bond_length_pred, mask)
bond_length_pred = paddle.reshape(bond_length_pred, (-1, ))
bond_length = paddle.masked_select(bond_length, mask)
bond_length = paddle.reshape(bond_length, (-1, ))
loss = self.loss(bond_length_pred, bond_length)
loss = paddle.mean(loss)
return loss
def train(model, data_loader, optimizer, lr_scheduler, epoch, LOG):
stages = 4
losses = [AverageMeter() for _ in range(stages)]
length_loader = len(data_loader)
model.train()
for batch_id, data in enumerate(data_loader()):
left_img, right_img, gt = data
mask = paddle.to_tensor(gt.numpy() > 0)
gt_mask = paddle.masked_select(gt, mask)
outputs = model(left_img, right_img)
outputs = [paddle.squeeze(output) for output in outputs]
tem_stage_loss = []
for index in range(stages):
temp_loss = args.loss_weights[index] * F.smooth_l1_loss(
paddle.masked_select(outputs[index], mask),
gt_mask,
reduction='mean')
tem_stage_loss.append(temp_loss)
losses[index].update(
float(temp_loss.numpy() / args.loss_weights[index]))
sum_loss = paddle.add_n(tem_stage_loss)
sum_loss.backward()
optimizer.step()
optimizer.clear_grad()
if batch_id % 5 == 0:
info_str = [
'Stage {} = {:.2f}({:.2f})'.format(x, losses[x].val,
losses[x].avg)
for x in range(stages)
]
info_str = '\t'.join(info_str)
info_str = 'Train Epoch{} [{}/{}] lr:{:.5f}\t{}'.format(
epoch, batch_id, length_loader, optimizer.get_lr(), info_str)
LOG.info(info_str)
lr_scheduler.step()
info_str = '\t'.join(
['Stage {} = {:.2f}'.format(x, losses[x].avg) for x in range(stages)])
LOG.info('Average train loss: ' + info_str)
def ohem_single(self, score, gt_text, training_mask, ohem_ratio=3):
pos_num = int(paddle.sum((gt_text > 0.5).astype('float32'))) - int(
paddle.sum(
paddle.logical_and((gt_text > 0.5), (training_mask <= 0.5))
.astype('float32')))
if pos_num == 0:
selected_mask = training_mask
selected_mask = selected_mask.reshape(
[1, selected_mask.shape[0], selected_mask.shape[1]]).astype(
'float32')
return selected_mask
neg_num = int(paddle.sum((gt_text <= 0.5).astype('float32')))
neg_num = int(min(pos_num * ohem_ratio, neg_num))
if neg_num == 0:
selected_mask = training_mask
selected_mask = selected_mask.view(
1, selected_mask.shape[0],
selected_mask.shape[1]).astype('float32')
return selected_mask
neg_score = paddle.masked_select(score, gt_text <= 0.5)
neg_score_sorted = paddle.sort(-neg_score)
threshold = -neg_score_sorted[neg_num - 1]
selected_mask = paddle.logical_and(
paddle.logical_or((score >= threshold), (gt_text > 0.5)),
(training_mask > 0.5))
selected_mask = selected_mask.reshape(
[1, selected_mask.shape[0], selected_mask.shape[1]]).astype(
'float32')
return selected_mask
def _shard_edges_by_dst(self, edges, edge_feat):
"""Shard Edges by dst
Args:
edges: list of (u, v) tuples, 2D numpy.ndarry or 2D paddle.Tensor
edge_feat (optional): a dict of numpy array as edge features (should
have consistent order with edges)
Returns:
Return a tuple (shard_edges, shard_edge_feat) as the shard results.
"""
shard_flag = edges[:, 1]
mask = (shard_flag % dist.get_world_size()) == dist.get_rank()
if type(mask) == paddle.Tensor:
eid = paddle.masked_select(paddle.arange(edges.shape[0]), mask)
shard_edges = paddle.gather(edges, eid)
shard_edge_feat = {}
for key, value in edge_feat.items():
shard_edge_feat[key] = paddle.gather(value, eid)
else:
eid = np.arange(edges.shape[0])[mask]
shard_edges = edges[eid]
shard_edge_feat = {}
for key, value in edge_feat.items():
shard_edge_feat[key] = value[eid]
return shard_edges, shard_edge_feat
def __call__(self, s_arc, s_rel, arcs, rels, mask):
arcs = paddle.masked_select(arcs, mask)
rels = paddle.masked_select(rels, mask)
select = paddle.nonzero(mask)
s_arc = paddle.gather_nd(s_arc, select)
s_rel = paddle.gather_nd(s_rel, select)
s_rel = index_sample(s_rel, paddle.unsqueeze(arcs, axis=1))
arc_cost = F.cross_entropy(s_arc, arcs)
rel_cost = F.cross_entropy(s_rel, rels)
avg_cost = paddle.mean(arc_cost + rel_cost)
return avg_cost
def _selected_pixel(ref_labels_flat, ref_emb_flat):
index_list = paddle.arange(len(ref_labels_flat))
index_list = index_list
index_ = paddle.masked_select(index_list, ref_labels_flat != -1)
index_ = long_(index_)
ref_labels_flat = paddle.index_select(ref_labels_flat, index_, 0)
ref_emb_flat = paddle.index_select(ref_emb_flat, index_, 0)
return ref_labels_flat, ref_emb_flat
def forward(self, node_repr, bond_angle_index, bond_angle, mask):
node_i, node_j, node_k = bond_angle_index
node_i_repr = paddle.index_select(node_repr, node_i)
node_j_repr = paddle.index_select(node_repr, node_j)
node_k_repr = paddle.index_select(node_repr, node_k)
node_ijk_repr = paddle.concat([node_i_repr, node_j_repr, node_k_repr],
axis=1)
bond_angle_pred = self.bond_angle_pred_linear(node_ijk_repr)
bond_angle_pred = paddle.masked_select(bond_angle_pred, mask)
bond_angle_pred = paddle.reshape(bond_angle_pred, [
-1,
])
bond_angle = paddle.masked_select(bond_angle, mask)
bond_angle = paddle.reshape(bond_angle, [
-1,
])
loss = self.loss(bond_angle_pred, bond_angle)
loss = paddle.mean(loss)
return loss
def test_imperative_mode(self):
paddle.disable_static()
shape = (88, 6, 8)
np_x = np.random.random(shape).astype('float32')
np_mask = np.array(np.random.randint(2, size=shape, dtype=bool))
x = paddle.to_tensor(np_x)
mask = paddle.to_tensor(np_mask)
out = paddle.masked_select(x, mask)
np_out = np_masked_select(np_x, np_mask)
self.assertEqual(np.allclose(out.numpy(), np_out), True)
paddle.enable_static()
def evaluate(model, loader, criterion, evaluator):
model.eval()
total_loss = []
y_true = []
y_pred = []
is_valid = []
for idx, batch_data in enumerate(loader):
g, mh_graphs, labels, unmask = batch_data
g = g.tensor()
multihop_graphs = []
for item in mh_graphs:
multihop_graphs.append(item.tensor())
g.multi_hop_graphs = multihop_graphs
labels = paddle.to_tensor(labels)
unmask = paddle.to_tensor(unmask)
pred = model(g)
eval_loss = criterion(paddle.masked_select(pred, unmask),
paddle.masked_select(labels, unmask))
total_loss.append(eval_loss.numpy())
y_pred.append(pred.numpy())
y_true.append(labels.numpy())
is_valid.append(unmask.numpy())
y_pred = np.concatenate(y_pred)
y_true = np.concatenate(y_true)
is_valid = np.concatenate(is_valid)
is_valid = is_valid.astype("bool")
y_true = y_true.astype("float32")
y_true[~is_valid] = np.nan
input_dict = {'y_true': y_true, 'y_pred': y_pred}
result = evaluator.eval(input_dict)
total_loss = np.mean(total_loss)
model.train()
return {"loss": total_loss, config.metrics: result[config.metrics]}
def get_loss(self, feat, inputs):
index = inputs['index']
mask = inputs['index_mask']
target = inputs['reid']
target = paddle.masked_select(target, mask > 0)
target = paddle.unsqueeze(target, 1)
feat = paddle.transpose(feat, perm=[0, 2, 3, 1])
feat_n, feat_h, feat_w, feat_c = feat.shape
feat = paddle.reshape(feat, shape=[feat_n, -1, feat_c])
index = paddle.unsqueeze(index, 2)
batch_inds = list()
for i in range(feat_n):
batch_ind = paddle.full(
shape=[1, index.shape[1], 1], fill_value=i, dtype='int64')
batch_inds.append(batch_ind)
batch_inds = paddle.concat(batch_inds, axis=0)
index = paddle.concat(x=[batch_inds, index], axis=2)
feat = paddle.gather_nd(feat, index=index)
mask = paddle.unsqueeze(mask, axis=2)
mask = paddle.expand_as(mask, feat)
mask.stop_gradient = True
feat = paddle.masked_select(feat, mask > 0)
feat = paddle.reshape(feat, shape=[-1, feat_c])
feat = F.normalize(feat)
feat = self.emb_scale * feat
logit = self.classifier(feat)
target.stop_gradient = True
loss = self.reid_loss(logit, target)
valid = (target != self.reid_loss.ignore_index)
valid.stop_gradient = True
count = paddle.sum((paddle.cast(valid, dtype=np.int32)))
count.stop_gradient = True
if count > 0:
loss = loss / count
return loss
def convert_key_to_inttensor(key):
if isinstance(key, np.ndarray):
# print(max(args),min(args),self.shape,len(args),len(set(args)) )
key=paddorch.from_numpy(key).long()
# print("converted numpy", type(args))
if isinstance(key,paddle.Tensor):
if key.dtype==paddle.fluid.core.VarDesc.VarType.BOOL:
key = paddle.masked_select(paddle.arange(len(key)), key)
elif key.dtype==paddle.fluid.core.VarDesc.VarType.INT32 or key.dtype==paddle.fluid.core.VarDesc.VarType.INT64:
return key
else:
return key.astype("int32")
if isinstance(key,int):
return paddorch.LongTensor(np.array([key]))
if isinstance(key,list):
key = paddorch.from_numpy(key).long()
return key
def forward(self, bond_types_batch, type_count_batch, bond_feat):
"""
Input example:
bond_types_batch: [0,0,2,0,1,2] + [0,0,2,0,1,2] + [2]
type_count_batch: [[3, 3, 0], [1, 1, 0], [2, 2, 1]] # [num_type, batch_size]
"""
bond_feat = self.fc_1(
paddle.reshape(bond_feat, [-1, self.num_angle * self.bond_dim]))
inter_mat_list = []
for type_i in range(self.num_type):
type_i_index = paddle.masked_select(paddle.arange(len(bond_feat)),
bond_types_batch == type_i)
if paddle.sum(type_count_batch[type_i]) == 0:
inter_mat_list.append(
paddle.to_tensor(np.array([0.] *
len(type_count_batch[type_i])),
dtype='float32'))
continue
bond_feat_type_i = paddle.gather(bond_feat, type_i_index)
graph_bond_index = op.get_index_from_counts(
type_count_batch[type_i])
# graph_bond_id = generate_segment_id_from_index(graph_bond_index)
graph_bond_id = generate_segment_id(graph_bond_index)
graph_feat_type_i = math.segment_pool(bond_feat_type_i,
graph_bond_id,
pool_type='sum')
mat_flat_type_i = self.fc_2(graph_feat_type_i).squeeze(1)
# print(graph_bond_id)
# print(graph_bond_id.shape, graph_feat_type_i.shape, mat_flat_type_i.shape)
my_pad = nn.Pad1D(padding=[
0, len(type_count_batch[type_i]) - len(mat_flat_type_i)
],
value=-1e9)
mat_flat_type_i = my_pad(mat_flat_type_i)
inter_mat_list.append(mat_flat_type_i)
inter_mat_batch = paddle.stack(inter_mat_list,
axis=1) # [batch_size, num_type]
inter_mat_mask = paddle.ones_like(inter_mat_batch) * -1e9
inter_mat_batch = paddle.where(
type_count_batch.transpose([1, 0]) > 0, inter_mat_batch,
inter_mat_mask)
inter_mat_batch = self.softmax(inter_mat_batch)
return inter_mat_batch
def test_static_mode(self):
shape = [8, 9, 6]
x = paddle.data(shape=shape, dtype='float32', name='x')
mask = paddle.data(shape=shape, dtype='bool', name='mask')
np_x = np.random.random(shape).astype('float32')
np_mask = np.array(np.random.randint(2, size=shape, dtype=bool))
out = paddle.masked_select(x, mask)
np_out = np_masked_select(np_x, np_mask)
exe = paddle.static.Executor(place=paddle.CPUPlace())
res = exe.run(paddle.static.default_main_program(),
feed={
"x": np_x,
"mask": np_mask
},
fetch_list=[out])
self.assertEqual(np.allclose(res, np_out), True)
def forward(self, graph, feature, norm=None):
"""
Args:
graph: `pgl.Graph` instance.
feature: A tensor with shape (num_nodes, input_size)
norm: (default None). If :code:`norm` is not None, then the feature will be normalized by given norm. If :code:`norm` is None, then we use `lapacian degree norm`.
Return:
A tensor with shape (num_nodes, output_size)
"""
if self.self_loop:
index = paddle.arange(start=0, end=graph.num_nodes, dtype="int64")
self_loop_edges = paddle.transpose(paddle.stack((index, index)),
[1, 0])
mask = graph.edges[:, 0] != graph.edges[:, 1]
mask_index = paddle.masked_select(
paddle.arange(end=graph.num_edges), mask)
edges = paddle.gather(graph.edges, mask_index) # remove self loop
edges = paddle.concat((self_loop_edges, edges), axis=0)
graph = pgl.Graph(num_nodes=graph.num_nodes, edges=edges)
if norm is None:
norm = GF.degree_norm(graph)
h0 = feature
for _ in range(self.k_hop):
feature = feature * norm
feature = graph.send_recv(feature)
feature = feature * norm
feature = self.alpha * h0 + (1 - self.alpha) * feature
return feature
def process_by_class(self, bboxes, embedding, bbox_inds, topk_clses):
pred_dets, pred_embs = [], []
for cls_id in range(self.num_classes):
inds_masks = topk_clses == cls_id
inds_masks = paddle.cast(inds_masks, 'float32')
pos_num = inds_masks.sum().numpy()
if pos_num == 0:
continue
cls_inds_mask = inds_masks > 0
bbox_mask = paddle.nonzero(cls_inds_mask)
cls_bboxes = paddle.gather_nd(bboxes, bbox_mask)
pred_dets.append(cls_bboxes)
cls_inds = paddle.masked_select(bbox_inds, cls_inds_mask)
cls_inds = cls_inds.unsqueeze(-1)
cls_embedding = paddle.gather_nd(embedding, cls_inds)
pred_embs.append(cls_embedding)
return paddle.concat(pred_dets), paddle.concat(pred_embs)
def forward(self, inputs, mask):
"""
forward
"""
x = paddle.masked_select(inputs, mask)
return x
def main(config):
if dist.get_world_size() > 1:
dist.init_parallel_env()
if dist.get_rank() == 0:
timestamp = datetime.now().strftime("%Hh%Mm%Ss")
log_path = os.path.join(config.log_dir,
"tensorboard_log_%s" % timestamp)
writer = SummaryWriter(log_path)
log.info("loading data")
raw_dataset = GraphPropPredDataset(name=config.dataset_name)
config.num_class = raw_dataset.num_tasks
config.eval_metric = raw_dataset.eval_metric
config.task_type = raw_dataset.task_type
mol_dataset = MolDataset(config,
raw_dataset,
transform=make_multihop_edges)
splitted_index = raw_dataset.get_idx_split()
train_ds = Subset(mol_dataset, splitted_index['train'], mode='train')
valid_ds = Subset(mol_dataset, splitted_index['valid'], mode="valid")
test_ds = Subset(mol_dataset, splitted_index['test'], mode="test")
log.info("Train Examples: %s" % len(train_ds))
log.info("Val Examples: %s" % len(valid_ds))
log.info("Test Examples: %s" % len(test_ds))
fn = CollateFn(config)
train_loader = Dataloader(train_ds,
batch_size=config.batch_size,
shuffle=True,
num_workers=config.num_workers,
collate_fn=fn)
valid_loader = Dataloader(valid_ds,
batch_size=config.batch_size,
num_workers=config.num_workers,
collate_fn=fn)
test_loader = Dataloader(test_ds,
batch_size=config.batch_size,
num_workers=config.num_workers,
collate_fn=fn)
model = ClassifierNetwork(config.hidden_size, config.out_dim,
config.num_layers, config.dropout_prob,
config.virt_node, config.K, config.conv_type,
config.appnp_hop, config.alpha)
model = paddle.DataParallel(model)
optim = Adam(learning_rate=config.lr, parameters=model.parameters())
criterion = nn.loss.BCEWithLogitsLoss()
evaluator = Evaluator(config.dataset_name)
best_valid = 0
global_step = 0
for epoch in range(1, config.epochs + 1):
model.train()
for idx, batch_data in enumerate(train_loader):
g, mh_graphs, labels, unmask = batch_data
g = g.tensor()
multihop_graphs = []
for item in mh_graphs:
multihop_graphs.append(item.tensor())
g.multi_hop_graphs = multihop_graphs
labels = paddle.to_tensor(labels)
unmask = paddle.to_tensor(unmask)
pred = model(g)
pred = paddle.masked_select(pred, unmask)
labels = paddle.masked_select(labels, unmask)
train_loss = criterion(pred, labels)
train_loss.backward()
optim.step()
optim.clear_grad()
if global_step % 80 == 0:
message = "train: epoch %d | step %d | " % (epoch, global_step)
message += "loss %.6f" % (train_loss.numpy())
log.info(message)
if dist.get_rank() == 0:
writer.add_scalar("loss", train_loss.numpy(), global_step)
global_step += 1
valid_result = evaluate(model, valid_loader, criterion, evaluator)
message = "valid: epoch %d | step %d | " % (epoch, global_step)
for key, value in valid_result.items():
message += " | %s %.6f" % (key, value)
if dist.get_rank() == 0:
writer.add_scalar("valid_%s" % key, value, global_step)
log.info(message)
test_result = evaluate(model, test_loader, criterion, evaluator)
message = "test: epoch %d | step %d | " % (epoch, global_step)
for key, value in test_result.items():
message += " | %s %.6f" % (key, value)
if dist.get_rank() == 0:
writer.add_scalar("test_%s" % key, value, global_step)
log.info(message)
if best_valid < valid_result[config.metrics]:
best_valid = valid_result[config.metrics]
best_valid_result = valid_result
best_test_result = test_result
message = "best result: epoch %d | " % (epoch)
message += "valid %s: %.6f | " % (config.metrics,
best_valid_result[config.metrics])
message += "test %s: %.6f | " % (config.metrics,
best_test_result[config.metrics])
log.info(message)
message = "final eval best result:%.6f" % best_valid_result[config.metrics]
log.info(message)
message = "final test best result:%.6f" % best_test_result[config.metrics]
log.info(message)
def forward(self, x, y):
"""
forward
"""
x = paddle.masked_select(x, y)
return x
def get_loss(self, head_outs, targets):
pred_cls, pred_bboxes, pred_obj,\
anchor_points, stride_tensor, num_anchors_list = head_outs
gt_labels = targets['gt_class']
gt_bboxes = targets['gt_bbox']
pred_scores = (pred_cls * pred_obj).sqrt()
# label assignment
center_and_strides = paddle.concat(
[anchor_points, stride_tensor, stride_tensor], axis=-1)
pos_num_list, label_list, bbox_target_list = [], [], []
for pred_score, pred_bbox, gt_box, gt_label in zip(
pred_scores.detach(),
pred_bboxes.detach() * stride_tensor, gt_bboxes, gt_labels):
pos_num, label, _, bbox_target = self.assigner(
pred_score, center_and_strides, pred_bbox, gt_box, gt_label)
pos_num_list.append(pos_num)
label_list.append(label)
bbox_target_list.append(bbox_target)
labels = paddle.to_tensor(np.stack(label_list, axis=0))
bbox_targets = paddle.to_tensor(np.stack(bbox_target_list, axis=0))
bbox_targets /= stride_tensor # rescale bbox
# 1. obj score loss
mask_positive = (labels != self.num_classes)
loss_obj = F.binary_cross_entropy(pred_obj,
mask_positive.astype(
pred_obj.dtype).unsqueeze(-1),
reduction='sum')
num_pos = sum(pos_num_list)
if num_pos > 0:
num_pos = paddle.to_tensor(num_pos, dtype=self._dtype).clip(min=1)
loss_obj /= num_pos
# 2. iou loss
bbox_mask = mask_positive.unsqueeze(-1).tile([1, 1, 4])
pred_bboxes_pos = paddle.masked_select(pred_bboxes,
bbox_mask).reshape([-1, 4])
assigned_bboxes_pos = paddle.masked_select(
bbox_targets, bbox_mask).reshape([-1, 4])
bbox_iou = bbox_overlaps(pred_bboxes_pos, assigned_bboxes_pos)
bbox_iou = paddle.diag(bbox_iou)
loss_iou = self.iou_loss(pred_bboxes_pos.split(4, axis=-1),
assigned_bboxes_pos.split(4, axis=-1))
loss_iou = loss_iou.sum() / num_pos
# 3. cls loss
cls_mask = mask_positive.unsqueeze(-1).tile(
[1, 1, self.num_classes])
pred_cls_pos = paddle.masked_select(pred_cls, cls_mask).reshape(
[-1, self.num_classes])
assigned_cls_pos = paddle.masked_select(labels, mask_positive)
assigned_cls_pos = F.one_hot(assigned_cls_pos,
self.num_classes + 1)[..., :-1]
assigned_cls_pos *= bbox_iou.unsqueeze(-1)
loss_cls = F.binary_cross_entropy(pred_cls_pos,
assigned_cls_pos,
reduction='sum')
loss_cls /= num_pos
# 4. l1 loss
if targets['epoch_id'] >= self.l1_epoch:
loss_l1 = F.l1_loss(pred_bboxes_pos,
assigned_bboxes_pos,
reduction='sum')
loss_l1 /= num_pos
else:
loss_l1 = paddle.zeros([1])
loss_l1.stop_gradient = False
else:
loss_cls = paddle.zeros([1])
loss_iou = paddle.zeros([1])
loss_l1 = paddle.zeros([1])
loss_cls.stop_gradient = False
loss_iou.stop_gradient = False
loss_l1.stop_gradient = False
loss = self.loss_weight['obj'] * loss_obj + \
self.loss_weight['cls'] * loss_cls + \
self.loss_weight['iou'] * loss_iou
if targets['epoch_id'] >= self.l1_epoch:
loss += (self.loss_weight['l1'] * loss_l1)
yolox_losses = {
'loss': loss,
'loss_cls': loss_cls,
'loss_obj': loss_obj,
'loss_iou': loss_iou,
'loss_l1': loss_l1,
}
return yolox_losses
def get_loss(self, head_outs, gt_meta):
pred_scores, pred_bboxes, anchors, \
num_anchors_list, stride_tensor = head_outs
gt_labels = gt_meta['gt_class']
gt_bboxes = gt_meta['gt_bbox']
pad_gt_mask = gt_meta['pad_gt_mask']
# label assignment
if gt_meta['epoch_id'] < self.static_assigner_epoch:
assigned_labels, assigned_bboxes, assigned_scores = self.static_assigner(
anchors,
num_anchors_list,
gt_labels,
gt_bboxes,
pad_gt_mask,
bg_index=self.num_classes)
alpha_l = 0.25
else:
assigned_labels, assigned_bboxes, assigned_scores = self.assigner(
pred_scores.detach(),
pred_bboxes.detach() * stride_tensor,
bbox_center(anchors),
num_anchors_list,
gt_labels,
gt_bboxes,
pad_gt_mask,
bg_index=self.num_classes)
alpha_l = -1
# rescale bbox
assigned_bboxes /= stride_tensor
# classification loss
loss_cls = self._focal_loss(pred_scores,
assigned_scores,
alpha=alpha_l)
# select positive samples mask
mask_positive = (assigned_labels != self.num_classes)
num_pos = mask_positive.astype(paddle.float32).sum()
# bbox regression loss
if num_pos > 0:
bbox_mask = mask_positive.unsqueeze(-1).tile([1, 1, 4])
pred_bboxes_pos = paddle.masked_select(pred_bboxes,
bbox_mask).reshape([-1, 4])
assigned_bboxes_pos = paddle.masked_select(
assigned_bboxes, bbox_mask).reshape([-1, 4])
bbox_weight = paddle.masked_select(assigned_scores.sum(-1),
mask_positive).unsqueeze(-1)
# iou loss
loss_iou = self.giou_loss(pred_bboxes_pos,
assigned_bboxes_pos) * bbox_weight
loss_iou = loss_iou.sum() / bbox_weight.sum()
# l1 loss
loss_l1 = F.l1_loss(pred_bboxes_pos, assigned_bboxes_pos)
else:
loss_iou = paddle.zeros([1])
loss_l1 = paddle.zeros([1])
loss_cls /= assigned_scores.sum().clip(min=1)
loss = self.loss_weight['class'] * loss_cls + self.loss_weight[
'iou'] * loss_iou
return {
'loss': loss,
'loss_class': loss_cls,
'loss_iou': loss_iou,
'loss_l1': loss_l1
}
def test_mask_dtype():
paddle.masked_select(x, mask_float)
def test_mask_type():
paddle.masked_select(x, np_mask)
def test_x_type():
paddle.masked_select(np_x, mask)
