def sample(self, root, sample_num, sample_for_dis: bool):
all_score = self.all_score
if sample_for_dis:
root_neighbor = self.graph[root]
k = min(int(0.1 * len(self.root_nodes)),
sample_num * len(root_neighbor))
sampled_nodes = [
i for i in random.sample(self.root_nodes, k=k)
if i not in root_neighbor
]
if len(sampled_nodes) == 0:
return []
prob = softmax(all_score[root, sampled_nodes])
sample = np.random.choice(sampled_nodes, size=sample_num,
p=prob).tolist()
return sample
else:
trace = [root]
node_select = root
while True:
node_neighbor = self.graph[node_select]
prob = softmax(all_score[node_select, node_neighbor])
node_select = np.random.choice(node_neighbor, size=1,
p=prob)[0]
trace.append(node_select)
if len(trace) == sample_num:
return trace
def find_top10(self, img_path):
# img = []
# for i in range(100):
# img.append(dataloader.loaddata(ground_img[i][0][0]))
img = self.img_list
# print('For {}'.format(img_path))
input_img = dataloader.loaddata(img_path)
img.append(input_img)
test_emb = image_encoder.embed_shoe(img)
simi, ans = self.similarity_class2(self.truth_table, test_emb)
# print(ans)
cand = [{"name": self.ground_img[index],
"similarity": -1*simi[index] }
for index in ans[:6]]
trans_simi = list(utils.softmax(np.array([info.get('similarity') for info in cand[3:]] ))) # length 6
high_cand = [{"name": cand_info.get('name'), "similarity": str(round(simi,2) ) } for
cand_info, simi in zip(cand[:3], trans_simi)]
low_cand = cand[3:]
for cand_info in high_cand:
cand_info['img'] = utils.crawl_img_url(cand_info.get('name'))
cand = {"high": high_cand, "low": low_cand}
return cand
def get_recs(g,
h,
model,
embed_dim,
k,
user_ids,
already_bought_dict,
remove_already_bought=True,
cuda=False,
device=None,
pred: str = 'cos',
use_popularity: bool = False,
weight_popularity=1):
"""
Computes K recommendation for all users, given hidden states, the model and what they already bought.
"""
if cuda: # model is already in cuda?
model = model.to(device)
print('Computing recommendations on {} users, for {} items'.format(
len(user_ids), g.num_nodes('item')))
recs = {}
for user in user_ids:
user_emb = h['user'][user]
already_bought = already_bought_dict[user]
user_emb_rpt = torch.cat(g.num_nodes('item') * [user_emb]).reshape(
-1, embed_dim)
if pred == 'cos':
cos = nn.CosineSimilarity(dim=1, eps=1e-6)
ratings = cos(user_emb_rpt, h['item'])
elif pred == 'nn':
cat_embed = torch.cat((user_emb_rpt, h['item']), 1)
ratings = model.pred_fn.layer_nn(cat_embed)
else:
raise KeyError(f'Prediction function {pred} not recognized.')
ratings_formatted = ratings.cpu().detach().numpy().reshape(
g.num_nodes('item'), )
if use_popularity:
softmax_ratings = softmax(ratings_formatted)
popularity_scores = g.ndata['popularity']['item'].numpy().reshape(
g.num_nodes('item'), )
ratings_formatted = np.add(softmax_ratings,
popularity_scores * weight_popularity)
order = np.argsort(-ratings_formatted)
if remove_already_bought:
order = [item for item in order if item not in already_bought]
rec = order[:k]
recs[user] = rec
return recs
def sample(self, root, tree, sample_num, for_d):
""" sample nodes from BFS-tree
Args:
root: int, root node
tree: dict, BFS-tree
sample_num: the number of required samples
for_d: bool, whether the samples are used for the generator or the discriminator
Returns:
samples: list, the indices of the sampled nodes
paths: list, paths from the root to the sampled nodes
"""
all_score = self.sess.run(self.generator.all_score)
samples = []
paths = []
n = 0
while len(samples) < sample_num:
current_node = root
previous_node = -1
paths.append([])
is_root = True
paths[n].append(current_node)
while True:
node_neighbor = tree[current_node][1:] if is_root else tree[
current_node]
is_root = False
if len(node_neighbor) == 0: # the tree only has a root
return None, None
if for_d: # skip 1-hop nodes (positive samples)
if node_neighbor == [root]:
# in current version, None is returned for simplicity
return None, None
if root in node_neighbor:
node_neighbor.remove(root)
relevance_probability = all_score[current_node, node_neighbor]
relevance_probability = utils.softmax(relevance_probability)
next_node = np.random.choice(
node_neighbor, size=1,
p=relevance_probability)[0] # select next node
paths[n].append(next_node)
if next_node == previous_node: # terminating condition
samples.append(current_node)
break
previous_node = current_node
current_node = next_node
n = n + 1
return samples, paths
def sample(self, root, tree, sample_num, for_d):
"""从 BFS-tree 中采样节点
Args:
root: int, 根节点
tree: dict, BFS-tree
sample_num: 需要采样的数量
for_d : bool, 样本是用在生成器还是判别器
Return:
samples: list，采样节点的索引
paths: list, 从根节点到采样节点的路径
"""
all_score = self.generator.all_score
samples = []
paths = []
n = 0
while len(samples) < sample_num:
current_node = root
previous_node = -1
paths.append([])
is_root = True
paths[n].append(current_node)
while True:
node_neighbor = tree[current_node][1:] if is_root else tree[current_node]
is_root = False
if len(node_neighbor) == 0: # 当树只有一个节点(根)时
return None, None
if for_d: # 跳过单跳节点（正采样）
if node_neighbor == [root]:
# 在当前的版本 None 被返回
return None, None
if root in node_neighbor:
node_neighbr.remove(root)
relevance_probability = all_score[current_node, node_neighbor]
relevance_probability = utils.softmax(relevance_probability)
next_node = np.random.choice(node_neighbor, size=1, p=relevance_probability)[0] # 选择下一个节点
paths[n].append(next_node)
if next_node == previous_node: # 结束条件
samples.append(current_node)
break
previous_node = current_node
current_node = next_node
n = n + 1
return samples, paths
def perform_predict(predictor,
loader,
model_weight,
label_weight,
weights,
save_weights=True):
temp_weight = {}
total_true_output = []
total_pred_output = []
total_pred_idx = []
total_true_idx = []
right_count = 0
n_labels = np.zeros((3, )) + 1e-5
n_right_labels = np.zeros((3, ))
with torch.no_grad():
for i, (input, target) in enumerate(tqdm(loader)):
test_pred_tta = []
for j in range(8):
output = predictor(input.cuda())
output = output.data.cpu().numpy()
test_pred_tta.append(output)
output_data = softmax(np.mean(test_pred_tta, axis=0))
# output = predictor(input.cuda())
# output_data = test_pred_tta.cpu().numpy()
if save_weights:
predict_idx = np.argmax(output, axis=-1)
target_idx = target.cpu().numpy()
total_pred_idx.extend(predict_idx)
total_true_idx.extend(target_idx)
for j in range(len(target_idx)):
# 统计预测中预测对的数量，相当于precision
n_labels[predict_idx[j]] += 1
# 统计真实中预测对的数量，相当于recall
# n_labels[target_idx[j]] += 1
if predict_idx[j] == target_idx[j]:
right_count += 1
n_right_labels[predict_idx[j]] += 1
total_true_output.append(target_idx[j])
total_pred_output.append(output_data[j])
else:
total_pred_output.extend(output_data)
model_name = model.default_cfg['model_name'].split('-')[1]
if save_weights:
# model_weight[predictor.default_cfg['model_name']] = np.array([float(right_count) / len(total_true_output)])
# label_weight[predictor.default_cfg['model_name']] = n_right_labels / n_labels
#
# temp_weight['model_weight'] = float(right_count) / len(total_true_output)
# temp_weight['label_weight'] = list(n_right_labels / n_labels)
# weights[predictor.default_cfg['model_name']] = temp_weight
#
# with open('./weights/fusion_weights_tta.json', 'w') as json_file:
# json.dump(weights, json_file, indent=4)
with open("./txts/v-info-new.json", 'r', encoding="utf-8") as f:
shape_dict = json.load(f)
filenames = dataset.filenames()
dets_info = {}
class_2_index = {0: 'normal', 1: 'phone', 2: 'smoke'}
probs = np.max(softmax(np.array(total_pred_output)), axis=-1)
for i, filename in enumerate(filenames):
name = filename.split('/')[-1].split('.')[0]
dets_info[name] = [
class_2_index[int(total_pred_idx[i])], probs[i],
shape_dict[name][1], shape_dict[name][2]
]
with open("fusions/fv.json", "w", encoding="utf-8") as f:
json.dump(dets_info, f, cls=MyEncoder)
accuracy = round(accuracy_score(total_true_idx, total_pred_idx), 4)
test_map, ap_list = eval_map(detFolder="fusions/fv.json",
gtFolder="txts/v-info-new.json",
return_each_ap=True)
print("Accuracy: %s, map: %.4f" % (accuracy, test_map))
with open("weights/fusion_weights_map.json", 'w',
encoding="utf-8") as f:
weights[predictor.default_cfg['model_name']] = {}
weights[
predictor.default_cfg['model_name']]["model_weight"] = test_map
weights[
predictor.default_cfg['model_name']]["label_weight"] = ap_list
json.dump(weights, f, cls=MyEncoder, indent=2)
model_weight[predictor.default_cfg['model_name']] = test_map
label_weight[predictor.default_cfg['model_name']] = ap_list
else:
with open('./weights/fusion_weights_tta.json', 'r') as json_file:
json_data = json.load(json_file)
model_weight[predictor.default_cfg['model_name']] = np.array(
[json_data[predictor.default_cfg['model_name']]['model_weight']])
label_weight[predictor.default_cfg['model_name']] = np.array(
[json_data[predictor.default_cfg['model_name']]['label_weight']])
return total_pred_output, total_true_output
def sample_taxo(self, data_size, update_ratio, sample_for_dis: bool):
taxo_all_score = self.taxo_all_score
if sample_for_dis:
nodes = []
cates = []
labels = []
while len(nodes) < data_size:
node = random.choice(self.root_nodes)
paths = self.nodeid2path.get(node, None)
if paths is None:
continue
true_category = self.nodeid2category[node]
true_path = random.choice(paths)
p = self.taxo_rootid
fake_path = []
for c in true_path:
siblings = [
i for i in self.taxo_parent2children[p]
if i not in true_category
]
if not siblings:
true_path = true_path[:len(fake_path)]
break
prob = softmax(taxo_all_score[node, siblings])
category_select = np.random.choice(siblings, p=prob)
fake_path.append(category_select)
p = c
n_pos, n_neg = len(true_path), len(fake_path)
cates.extend(true_path)
labels.extend([1] * n_pos)
cates.extend(fake_path)
labels.extend([0] * n_neg)
nodes.extend([node] * (n_pos + n_neg))
levels = [self.taxo_child2parents[c] for c in cates]
return nodes, cates, labels, levels
else:
nodes = []
cates = []
while len(nodes) < data_size:
node = random.choice(self.root_nodes)
paths = self.nodeid2path.get(node, None)
if paths is None:
continue
true_category = self.nodeid2category[node]
true_path = random.choice(paths)
p = self.taxo_rootid
for c in true_path:
siblings = [
i for i in self.taxo_parent2children[p]
if i not in true_category
]
if not siblings:
break
if len(siblings) > 1:
prob = softmax(taxo_all_score[node, siblings])
siblings = np.random.choice(siblings, size=1,
p=prob).tolist()
siblings.append(c)
cates.extend(siblings)
nodes.extend([node] * len(siblings))
p = c
levels = [self.taxo_child2parents[c] for c in cates]
return nodes, cates, levels
