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hoc.py
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hoc.py
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import torch
import torch.nn.functional as F
from utils import *
def get_T_HOC(config, model, train_dataloader_EF, rnd, test_flag=False, max_step=501, T0=None, p0=None, lr=0.1):
config.path, record, c1m_cluster_each = init_feature_set(config, model, train_dataloader_EF, rnd)
sub_clean_dataset_name, sub_noisy_dataset_name = build_dataset_informal(config, record, c1m_cluster_each)
if test_flag:
return 0, 0, 0
if config.loss == 'fw': # forward loss correction
# return one matrix if global
# return a set of matrices + a map between index and matrix
T_est, P_est, T_init, T_err = get_T_P_global(config, sub_noisy_dataset_name, max_step, T0, p0, lr=lr)
# T_est = config.T
if config.local:
T_local, map_index_T, T_err = get_T_P_local(config, sub_noisy_dataset_name, T_est)
return T_local, map_index_T, T_err
else:
return T_est, T_init, T_err
else:
return 0, 0, 0
def get_T_P_global(config, sub_noisy_dataset_name, max_step=501, T0=None, p0=None, lr=0.1):
global GLOBAL_T_REAL
# all_point_cnt = 10000
all_point_cnt = 15000
# all_point_cnt = 2000
NumTest = int(50)
# NumTest = int(20)
# TODO: make the above parameters configurable
print(f'Estimating global T. Sampling {all_point_cnt} examples each time')
KINDS = config.num_classes
data_set = torch.load(f'{sub_noisy_dataset_name}', map_location=torch.device('cpu'))
T_real, P_real = check_T_torch(KINDS, data_set['clean_label'], data_set['noisy_label'])
GLOBAL_T_REAL = T_real
p_real = count_real(KINDS, torch.tensor(T_real), torch.tensor(P_real), -1)
# Build Feature Clusters --------------------------------------
p_estimate = [[] for _ in range(3)]
p_estimate[0] = torch.zeros(KINDS)
p_estimate[1] = torch.zeros(KINDS, KINDS)
p_estimate[2] = torch.zeros(KINDS, KINDS, KINDS)
p_estimate_rec = torch.zeros(NumTest, 3)
for idx in range(NumTest):
print(idx, flush=True)
# global
sample = np.random.choice(range(data_set['feature'].shape[0]), all_point_cnt, replace=False)
final_feat = data_set['feature'][sample]
noisy_label = data_set['noisy_label'][sample]
cnt_y_3 = count_y(KINDS, final_feat, noisy_label, all_point_cnt)
for i in range(3):
cnt_y_3[i] /= all_point_cnt
p_estimate[i] = p_estimate[i] + cnt_y_3[i] if idx != 0 else cnt_y_3[i]
ss = torch.abs(p_estimate[i] / (idx + 1) - p_real[i])
p_estimate_rec[idx, i] = torch.mean(torch.abs(p_estimate[i] / (idx + 1) - p_real[i])) * 100.0 / (
torch.mean(p_real[i])) # Assess the gap between estimation value and real value
print(p_estimate_rec[idx], flush=True)
for j in range(3):
p_estimate[j] = p_estimate[j] / NumTest
loss_min, E_calc, P_calc, T_init = calc_func(KINDS, p_estimate, False, config.device, max_step, T0, p0, lr=lr)
P_calc = P_calc.view(-1).cpu().numpy()
E_calc = E_calc.cpu().numpy()
T_init = T_init.cpu().numpy()
# print("----Real value----------")
# print(f'Real: P = {P_real},\n T = \n{np.round(np.array(T_real),3)}')
# print(f'Sum P = {sum(P_real)},\n sum T = \n{np.sum(np.array(T_real), 1)}')
# print("\n----Calc result----")
# print(f"loss = {loss_min}, \np = {P_calc}, \nT_est = \n{np.round(E_calc, 3)}")
# print(f"sum p = {np.sum(P_calc)}, \nsum T_est = \n{np.sum(E_calc, 1)}")
# print("\n---Error of the estimated T (sum|T_est - T|/N * 100)----", flush=True)
print(f"L11 Error (Global): {np.sum(np.abs(E_calc - np.array(T_real))) * 1.0 / KINDS * 100}")
T_err = np.sum(np.abs(E_calc - np.array(T_real))) * 1.0 / KINDS * 100
rec_global = [[] for _ in range(3)]
rec_global[0], rec_global[1], rec_global[2] = loss_min, T_real, E_calc
path = "./rec_global/" + config.dataset + "_" + config.label_file_path[11:14] + "_" + config.pre_type + ".pt"
torch.save(rec_global, path)
return E_calc, P_calc, T_init, T_err
def get_T_P_local(config, sub_noisy_dataset_name, T_avg=None):
global GLOBAL_T_REAL
rounds = 300
all_point_cnt = 100 # 500 for global 100 for local
NumTest = int(30)
# TODO: make the above parameters configurable
print(f'Estimating local T. Sampling {all_point_cnt} examples each time')
KINDS = config.num_classes
data_set = torch.load(f'{sub_noisy_dataset_name}', map_location=torch.device('cpu'))
next_select_idx = np.random.choice(range(data_set['index'].shape[0]), 1, replace=False)
selected_idx = torch.tensor(range(data_set['index'].shape[0]))
T_rec = []
T_true_rec = []
map_index_T = np.zeros((data_set['index'].shape[0]), dtype='int') - 1
round = 0
T_err_list = []
while (1):
# for round in range(rounds):
if config.local: # Select a picture & nearest 250 pictures: count t_ Real and P_ real
# Start a cycle here and run about 300 * numtest times to the end
# One center is extracted each time, and numLocal adjacent points are taken as cluster, which are recorded as selected_ idx
idx_sel = torch.tensor(
extract_sub_dataset_local(data_set['feature'], next_select_idx, numLocal=config.numLocal))
# assign round value to the locations with value -1
map_index_T[idx_sel[map_index_T[idx_sel] == -1]] = round
next_select_idx, selected_idx = select_next_idx(selected_idx, idx_sel)
T_real, P_real = check_T_torch(KINDS, data_set['clean_label'][idx_sel],
data_set['noisy_label'][idx_sel]) # focus on 250 samples
# T and P of local cluster
p_real = count_real(KINDS, torch.tensor(T_real), torch.tensor(P_real), -1) if config.local else count_real(
KINDS, torch.tensor(config.T), torch.tensor(config.P), -1)
# Build Feature Clusters --------------------------------------
p_estimate = [[] for _ in range(3)]
p_estimate[0] = torch.zeros(KINDS)
p_estimate[1] = torch.zeros(KINDS, KINDS)
p_estimate[2] = torch.zeros(KINDS, KINDS, KINDS)
p_estimate_rec = torch.zeros(NumTest, 3)
for idx in range(NumTest):
# local
sample = np.random.choice(idx_sel, all_point_cnt,
replace=False) # test: extract 100 samples from local cluster
final_feat = data_set['feature'][sample]
noisy_label = data_set['noisy_label'][sample]
#
cnt_y_3 = count_y(KINDS, final_feat, noisy_label, all_point_cnt)
for i in range(3):
cnt_y_3[i] /= all_point_cnt
p_estimate[i] = p_estimate[i] + cnt_y_3[i] if idx != 0 else cnt_y_3[i]
p_estimate_rec[idx, i] = torch.mean(torch.abs(p_estimate[i] / (idx + 1) - p_real[i])) * 100.0 / (
torch.mean(p_real[i]))
# Calculate T & P -------------------------------------------------------------
for j in range(3):
p_estimate[j] = p_estimate[j] / NumTest
loss_min, E_calc, P_calc, _ = calc_func(KINDS, p_estimate, True,
config.device) # E_calc, P_calc = calc_func(p_real)
P_calc = P_calc.view(-1).cpu().numpy()
E_calc = E_calc.cpu().numpy()
center_label = np.argmax(P_real)
T_rec += [P_calc.reshape(-1, 1) * E_calc + (1 - P_calc).reshape(-1, 1) * T_avg] # estimated local T
T_true_rec += [P_real.reshape(-1, 1) * T_real + (1 - P_real).reshape(-1, 1) * GLOBAL_T_REAL]
# print("\n---Error of the estimated T (sum|T_est - T|/N * 100)----", flush=True)
# print("----T_rec[round]", np.array(T_rec[round]))
# print("----T_true_rec[round]", np.array(T_true_rec[round]))
T_err = np.sum(np.abs(np.array(T_rec[round]) - np.array(T_true_rec[round]))) * 1.0 / KINDS * 100
print(f"L11 Error (Local): {T_err}")
T_err_list.append(T_err)
print(f'round {round}, remaining {np.sum(map_index_T == -1)}')
round += 1
if round == rounds:
print(
f'Only get local transition matrices for the first {np.sum(map_index_T != -1)} examples in {rounds} rounds',
flush=True)
T_rec += [T_avg]
map_index_T[map_index_T == -1] = round # use T_avg for the remaining matrices
return T_rec, map_index_T, T_err_list
if selected_idx[selected_idx > -1].size(0) == 0:
return T_rec, map_index_T, T_err_list
# did not use P currently
def func(KINDS, p_estimate, T_out, P_out, N, step, LOCAL, _device):
eps = 1e-2
eps2 = 1e-8
eps3 = 1e-5
loss = torch.tensor(0.0).to(_device) # define the loss
P = smp(P_out)
T = smt(T_out)
mode = random.randint(0, KINDS - 1)
mode = -1
# Borrow p_ The calculation method of real is to calculate the temporary values of T and P at this time: N, N*N, N*N*N
p_temp = count_real(KINDS, T.to(torch.device("cpu")), P.to(torch.device("cpu")), mode, _device)
weight = [1.0, 1.0, 1.0]
# weight = [2.0,1.0,1.0]
for j in range(3): # || P1 || + || P2 || + || P3 ||
p_temp[j] = p_temp[j].to(_device)
loss += weight[j] * torch.norm(p_estimate[j] - p_temp[j]) # / np.sqrt(N**j)
if step > 100 and LOCAL and KINDS != 100:
loss += torch.mean(torch.log(P + eps)) / 10
return loss
def calc_func(KINDS, p_estimate, LOCAL, _device, max_step=501, T0=None, p0=None, lr=0.1):
# init
# _device = torch.device("cpu")
N = KINDS
eps = 1e-8
if T0 is None:
T = 5 * torch.eye(N) - torch.ones((N, N))
else:
T = T0
if p0 is None:
P = torch.ones((N, 1), device=None) / N + torch.rand((N, 1), device=None) * 0.1 # P:0-9 distribution
else:
P = p0
T = T.to(_device)
P = P.to(_device)
p_estimate = [item.to(_device) for item in p_estimate]
print(f'using {_device} to solve equations')
T.requires_grad = True
P.requires_grad = True
optimizer = torch.optim.Adam([T, P], lr=lr)
# train
loss_min = 100.0
T_rec = T.detach()
P_rec = P.detach()
time1 = time.time()
for step in range(max_step):
if step:
optimizer.zero_grad()
loss.backward()
optimizer.step()
loss = func(KINDS, p_estimate, T, P, N, step, LOCAL, _device)
if loss < loss_min and step > 5:
loss_min = loss.detach()
T_rec = T.detach()
P_rec = P.detach()
# if step % 10 == 0:
# print('loss {}'.format(loss))
# print(f'step: {step} time_cost: {time.time() - time1}')
# print(f'T {np.round(smt(T.cpu()).detach().numpy()*100,1)}', flush=True)
# print(f'P {np.round(smp(P.cpu().view(-1)).detach().numpy()*100,1)}', flush=True)
# time1 = time.time()
# if global_var.get_value('T_init') is None:
global_var.set_value('T_init', T_rec.detach())
# tmp = global_var.get_value('T_init')
# print(f'set T_init to {tmp}')
# if global_var.get_value('p_init') is None:
global_var.set_value('p_init', P_rec.detach())
print(f'T_init and p_init are updated')
return loss_min, smt(T_rec).detach(), smp(P_rec).detach(), T_rec.detach()
def count_y(KINDS, feat_cord, label, cluster_sum):
# feat_cord = torch.tensor(final_feat)
cnt = [[] for _ in range(3)]
cnt[0] = torch.zeros(KINDS)
cnt[1] = torch.zeros(KINDS, KINDS)
cnt[2] = torch.zeros(KINDS, KINDS, KINDS)
feat_cord = feat_cord.cpu().numpy()
dist = distCosine(feat_cord, feat_cord)
max_val = np.max(dist)
am = np.argmin(dist, axis=1)
for i in range(cluster_sum):
dist[i][am[i]] = 10000.0 + max_val
min_dis_id = np.argmin(dist, axis=1)
for i in range(cluster_sum):
dist[i][min_dis_id[i]] = 10000.0 + max_val
min_dis_id2 = np.argmin(dist, axis=1)
for x1 in range(cluster_sum):
cnt[0][label[x1]] += 1
cnt[1][label[x1]][label[min_dis_id[x1]]] += 1
cnt[2][label[x1]][label[min_dis_id[x1]]][label[min_dis_id2[x1]]] += 1
return cnt
def count_2nn_acc(KINDS, feat_cord, label, cluster_sum):
# feat_cord = torch.tensor(final_feat)
cnt = [[] for _ in range(3)]
cnt[0] = torch.zeros(KINDS)
cnt[1] = torch.zeros(KINDS, KINDS)
cnt[2] = torch.zeros(KINDS, KINDS, KINDS)
feat_cord = feat_cord.cpu().numpy()
dist = distCosine(feat_cord, feat_cord)
# print(dist.shape)
# print(f'Use Euclidean distance')
# dist = distEuclidean(feat_cord, feat_cord)
max_val = np.max(dist)
am = np.argmin(dist, axis=1)
# TODO: speedup this part
for i in range(cluster_sum):
dist[i][am[i]] = 10000.0 + max_val
min_dis_id = np.argmin(dist, axis=1)
for i in range(cluster_sum):
dist[i][min_dis_id[i]] = 10000.0 + max_val
min_dis_id2 = np.argmin(dist, axis=1)
for x1 in range(cluster_sum):
cnt[0][label[x1]] += 1
cnt[1][label[x1]][label[min_dis_id[x1]]] += 1
cnt[2][label[x1]][label[min_dis_id[x1]]][label[min_dis_id2[x1]]] += 1
return cnt
def count_knn_conf(args, feat_cord, label, cluster_sum, k):
# feat_cord = torch.tensor(final_feat)
KINDS = args.num_classes
# cnt = [[] for _ in range(3)]
# cnt[0] = torch.zeros(KINDS)
# cnt[1] = torch.zeros(KINDS, KINDS)
# cnt[2] = torch.zeros(KINDS, KINDS, KINDS)
dist = cosDistance(feat_cord)
print(f'knn parameter is k = {k}')
time1 = time.time()
min_similarity = args.min_similarity
values, indices = dist.topk(k, dim=1, largest=False, sorted=True)
knn_labels = label[indices]
knn_labels_cnt = torch.zeros(cluster_sum, KINDS)
for i in range(KINDS):
knn_labels_cnt[:, i] += torch.sum((1.0 - min_similarity - values) * (knn_labels == i),
1) # similarity should be larger than min_similarity
# print(knn_labels_cnt[0])
time2 = time.time()
print(f'Running time for k = {k} is {time2 - time1}')
confidence = torch.sum(knn_labels_cnt, 1).reshape(-1)
return confidence
def count_knn_distribution(args, feat_cord, label, cluster_sum, k, norm='l2'):
# feat_cord = torch.tensor(final_feat)
KINDS = args.num_classes
# cnt = [[] for _ in range(3)]
# cnt[0] = torch.zeros(KINDS)
# cnt[1] = torch.zeros(KINDS, KINDS)
# cnt[2] = torch.zeros(KINDS, KINDS, KINDS)
dist = cosDistance(feat_cord)
# dist = torch.cdist(feat_cord,feat_cord,p=2)
# import pdb
# pdb.set_trace()
print(f'knn parameter is k = {k}')
time1 = time.time()
min_similarity = args.min_similarity
values, indices = dist.topk(k, dim=1, largest=False, sorted=True)
values[:, 0] = 2.0 * values[:, 1] - values[:, 2]
knn_labels = label[indices]
# # check knn feasibility
# feasibility = torch.zeros(k)
# prob = torch.zeros(k)
# # import pdb
# # pdb.set_trace()
# e=0.4
# import scipy.special as sc
# for i in range(k):
# feasibility[i] = torch.mean(1.0*(torch.sum(knn_labels[:,:i+1] == knn_labels[:,0].view(50000,1),1) == i+1))
# k1=int(np.ceil((i+1)/2)-1)
# a = sc.betainc(i-k1+1,k1+1,1-e)
# prob[i] = feasibility[i] * a
# print(f'delta_k is: {1-feasibility}')
# print(f'probability lower bound is: {prob}')
# torch.save({'delta_k': 1-feasibility, 'prob': prob}, f'{args.pre_type}_c100_{k}.pt')
# # # e=0.4
# # # k=20
# # # k1=int(np.ceil((k+1)/2)-1)
# # # a = sc.betainc(k-k1+1,k1+1,1-e)
# # # k=5
# # # k1=int(np.ceil((k+1)/2)-1)
# # # b = sc.betainc(k-k1+1,k1+1,1-e)
# # # # b/a
# # # print(f'a={a}, b={b}, b/a={a/b}')
# exit()
knn_labels_cnt = torch.zeros(cluster_sum, KINDS)
# thre_val_tmp = torch.tensor([[0.1766, 0.2208],
# [0.1423, 0.1991],
# [0.1439, 0.1672],
# [0.1063, 0.1464],
# [0.1192, 0.1708],
# [0.1318, 0.1464],
# [0.1206, 0.1672],
# [0.1151, 0.1795],
# [0.1452, 0.2184],
# [0.1517, 0.1991]])
# thre_val = torch.mean(thre_val_tmp,1)
for i in range(KINDS):
# knn_labels_cnt[:,i] += torch.sum(1.0 * (knn_labels == i), 1)
knn_labels_cnt[:, i] += torch.sum((1.0 - min_similarity - values) * (knn_labels == i), 1)
# knn_labels_cnt[:,i] += torch.sum((1.0 - min_similarity - values) * (knn_labels == i) * (values < thre_val[i]), 1) # similarity should be larger than min_similarity
# print(knn_labels_cnt[0])
time2 = time.time()
print(f'Running time for k = {k} is {time2 - time1}')
# # ----------- old -------------
# # feat_cord = feat_cord.cpu().numpy()
# # dist = distCosine(feat_cord, feat_cord)
# # import pdb
# # pdb.set_trace()
# # print(f'Use Euclidean distance')
# # dist = distEuclidean(feat_cord, feat_cord)
# max_val = np.max(dist)
# k += 1 # k-nn -> k+1 instances
# knn_labels_cnt = torch.zeros(cluster_sum, KINDS)
# for k_loop in range(k):
# # print(k_loop, flush=True)
# min_dis_id = np.argmin(dist,axis=1)
# knn_labels = label[min_dis_id]
# # not count self label
# # if k_loop > 0:
# # for i in range(cluster_sum):
# # knn_labels_cnt[i, knn_labels[i]] += 1
# # dist[i][min_dis_id[i]] = 10000.0 + max_val
# # else:
# # for i in range(cluster_sum):
# # dist[i][min_dis_id[i]] = 10000.0 + max_val
# # # count self label
# # for i in range(cluster_sum):
# # knn_labels_cnt[i, knn_labels[i]] += 1
# # dist[i][min_dis_id[i]] = 10000.0 + max_val
# # count self label, distance as weights (weight = 1-dist)
# for i in range(cluster_sum):
# knn_labels_cnt[i, knn_labels[i]] += 1-dist[i][min_dis_id[i]]
# dist[i][min_dis_id[i]] = 10000.0 + max_val
if norm == 'l2':
# normalized by l2-norm -- cosine distance
knn_labels_prob = F.normalize(knn_labels_cnt, p=2.0, dim=1)
elif norm == 'l1':
# normalized by mean
knn_labels_prob = knn_labels_cnt / torch.sum(knn_labels_cnt, 1).reshape(-1, 1)
else:
raise NameError('Undefined norm')
return knn_labels_prob
def get_score(knn_labels_cnt, label, k, method='cores', prior=None): # method = ['cores', 'peer']
# knn_labels_cnt: sampleSize * #class
# knn_labels_cnt /= (k*1.0)
# import pdb
# pdb.set_trace()
loss = F.nll_loss(torch.log(knn_labels_cnt + 1e-8), label, reduction='none')
# loss = -torch.tanh(-F.nll_loss(knn_labels_cnt, label, reduction = 'none')) # TV
# loss = -(-F.nll_loss(knn_labels_cnt, label, reduction = 'none')) #
# loss_numpy = loss.data.cpu().numpy()
# num_batch = len(loss_numpy)
# loss_v = np.zeros(num_batch)
# loss_div_numpy = float(np.array(0))
# loss_ = -(knn_labels_cnt) #
# loss_ = -torch.tanh(knn_labels_cnt) # TV
# import pdb
# pdb.set_trace()
loss_ = -torch.log(knn_labels_cnt + 1e-8)
if method == 'cores':
score = loss - torch.mean(loss_, 1)
# score = loss
elif method == 'peer':
prior = torch.tensor(prior)
score = loss - torch.sum(torch.mul(prior, loss_), 1)
elif method == 'ce':
score = loss
elif method == 'avg':
score = - torch.mean(loss_, 1)
elif method == 'new':
score = 1.1 * loss - torch.mean(loss_, 1)
else:
raise NameError('Undefined method')
return score