def forward(self, x):
preds = [m(x) for m in self.models]
preds_mean = torch.mean(torch.stack(preds), axis=0)
preds = torch.stack([torch.max(pred, -1)[1] for pred in preds])
preds = torch.mode(preds, 0)[0]
return preds
def connected_components(self, Z):
""" Compute simple connected components algorithm.
@param Z: a [n x d] torch.FloatTensor of datapoints
@return: a [n] torch.LongTensor of cluster labels
"""
n, d = Z.shape
K = 0
# SAMPLING/GROUPING
cluster_labels = torch.ones(
(n, ), dtype=torch.long, device=Z.device) * -1
for i in range(n):
if cluster_labels[i] == -1:
# Find all points close to it and label it the same
distances = self.distance(Z, Z[i:i + 1]) # Shape: [n x 1]
component_seeds = distances[:, 0] <= self.epsilon
# If at least one component already has a label, then use the mode of the label
if torch.unique(cluster_labels[component_seeds]).shape[0] > 1:
temp = cluster_labels[component_seeds]
temp = temp[temp != -1]
label = torch.mode(temp)[0].to(Z.device)
else:
label = torch.tensor(K).to(Z.device)
K += 1 # Increment number of clusters
cluster_labels[component_seeds] = label
return cluster_labels
def compile_items(self, window_size, step_size):
segments = zip(
get_windows(torch.Tensor(self.acc), window_size, step_size),
get_windows(torch.Tensor(self.ppg), window_size, step_size),
get_windows(torch.Tensor(self.hr), window_size, step_size),
get_windows(torch.Tensor(self.activity), window_size, step_size),
)
items = []
for n_in_experiment, (acc, ppg, hr, activity) in enumerate(segments):
activity = activity.squeeze()
activity_label = torch.mode(activity, 0)[0].long()
item = {
'acc': acc,
'ppg': ppg,
'hr': hr,
'hr_label': self._get_hr_label(hr, window_size).view(1),
'activity': activity,
'activity_label': activity_label,
'n_in_experiment': torch.tensor(n_in_experiment),
'experiment_id': torch.tensor(int(self.user_info.item(0)['Name'])),
'user_id': torch.tensor(int(self.user_info.item(0)['Name']))
}
if not self.ignore_zero:
items.append(item)
elif item['activity_label'] != 0:
item['activity_label'] -= 1
items.append(item)
return items
def classifyImage(path, model, classes):
image = cv2.imread(path, 1)
PILImage = Image.fromarray(image)
testTransforms = transforms.Compose([
transforms.Resize(255),
transforms.CenterCrop(224),
transforms.ToTensor(),
transforms.Normalize([0.485, 0.456, 0.406], [0.229, 0.224, 0.225])
])
input = testTransforms(PILImage)
device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
input = input.to(device)
# output = model.forward(input[None, ...])
output = model.forward(input[None])
probabilityOutput = torch.exp(output)
topProbability, predictedClass = probabilityOutput.topk(1, dim=1)
predictedClass = torch.squeeze(predictedClass)
mode = torch.mode(predictedClass, 0)
# fig = plt.figure(figsize=(28, 8))
# ax = fig.add_subplot(2, 20 / 2, 1, xticks=[], yticks=[])
# plt.imshow(np.transpose(input.cpu().numpy(), (1, 2, 0)).astype('uint8'))
# ax.set_title(classes[mode[0].item()])
return classes[mode[0].item()]
def variation_ratios(predictions):
label_predictions = torch.max(predictions, dim=2)[1]
modes, _ = torch.mode(label_predictions, dim=0)
num_occurences = (label_predictions == modes).sum(dim=0)
scores = 1. - num_occurences.float() / label_predictions.shape[0]
return scores
def forward(self, inputs, k):
inputs = inputs.unsqueeze(1).repeat(1, self.data.shape[0], 1)
distance = ((inputs - self.data) ** 2).sum(dim=2) # shape=(num_sample, num_base_sample)
_, index = torch.topk(distance, k, dim=1) # index shape=(num_sample, k)
index = index // self.num_each_class
pred, _ = torch.mode(index, dim=1)
return pred
def predict(self, data):
'''
Use classifier to predict data label.
Will prioritize using label tags if defined.
:param data: list, np.array, or torch.Tensor
'''
try:
if 'Tensor' not in str(type(data)):
data = torch.Tensor([data])
if len(data.shape) == 1:
data = torch.reshape(data, [1, data.shape[0]])
except:
assert (False), "Invalid data type (Expected torch.Tensor)"
#main algorithm
distances = self.data - data
distances = torch.sum(distances**2, dim=1)
inds = torch.argsort(
distances) #can change this, do we want O(k*n) or O(n log(n))?
lab = []
for i in range(min(self.k, inds.shape[0])):
lab.append(self.labels[inds[i]])
lab = torch.Tensor(lab).squeeze()
out = torch.mode(lab)[0]
if self.reverse_tags is not None:
return self.reverse_tags[int(out)]
else:
return int(out)
def reduction_ops(self):
a = torch.randn(4)
b = torch.randn(4)
return (
torch.argmax(a),
torch.argmin(a),
torch.amax(a),
torch.amin(a),
torch.aminmax(a),
torch.all(a),
torch.any(a),
torch.max(a),
torch.min(a),
torch.dist(a, b),
torch.logsumexp(a, 0),
torch.mean(a),
torch.nanmean(a),
torch.median(a),
torch.nanmedian(a),
torch.mode(a),
torch.norm(a),
torch.nansum(a),
torch.prod(a),
torch.quantile(a, torch.tensor([0.25, 0.5, 0.75])),
torch.nanquantile(a, torch.tensor([0.25, 0.5, 0.75])),
torch.std(a),
torch.std_mean(a),
torch.sum(a),
torch.unique(a),
torch.unique_consecutive(a),
torch.var(a),
torch.var_mean(a),
torch.count_nonzero(a),
)
def get_predict(self, unlabeled_path):
all_input_ids, all_token_type_ids, \
all_attention_mask, all_label_ids = self.get_X_y_ids(unlabeled_path)
dataset = TensorDataset(all_input_ids, all_token_type_ids,
all_attention_mask)
batch_size = self.n_gpu * self.per_gpu_batch_size
dataloader = DataLoader(dataset=dataset,
batch_size=batch_size,
shuffle=False)
model = CLS_Model(vocab_size=self.bert_tokenizer.vocab_size,
embed_size=self.embed_size,
num_labels=len(self.label_list),
dense_layer_type=self.dense_layer_type,
dropout=self.dropout,
embed_type=self.embed_type,
max_len=self.max_seq_len,
model_name_or_path=self.model_name_or_path,
vector_file=self.vector_file)
model.to(self.device)
y_preds = []
for model_state_path in glob(
os.path.join(self.output_dir,
'*{}*.pt*'.format(self.model_name))):
model.load_state_dict(torch.load(model_state_path))
y_pred = self.single_predict(model, dataloader)
y_preds.append(y_pred)
y_preds = torch.tensor(y_preds)
y_pred = torch.mode(y_preds, dim=0).values
y_pred = y_pred.numpy()
return y_pred
def relabel(y, y_hat):
k = len(y_hat.unique())
y_hat_rl = y_hat.clone()
for i in range(k):
l = torch.mode(y[y_hat == i])[0]
y_hat_rl[y_hat == i] = l
return y_hat_rl
def predict(self, x):
# get number of samples in batch
bs = x.shape[0]
# add noise to input batch
x = x.unsqueeze(1) + self.input_dist.sample()[:bs].to(self.device)
# reshape input batch by stacking samples into batch dimension
x = x.view((
bs * self.n_samples,
self.config['input_dimensions'][-1],
self.config['input_dimensions'][0],
self.config['input_dimensions'][1]))
# compute output batch logits and predictions
logits = self.model(x)
pred = torch.argmax(logits, dim=1)
# reshape predictions to unstack samples from batch dimension
pred = pred.view((bs, self.n_samples))
# take mode along sample dim to get final prediction
pred = torch.mode(pred, dim=1)[0]
return pred
def predict(self, X):
all_input_ids, all_input_mask_ids, all_label_ids, all_label_mask_ids = self.get_X_y_ids(X)
dataset = TensorDataset(all_input_ids, all_input_mask_ids, all_label_ids)
batch_size = self.n_gpu * self.per_gpu_batch_size
dataloader = DataLoader(dataset=dataset, batch_size=batch_size, shuffle=False)
model = NER_Model(vocab_size=self.bert_tokenizer.vocab_size, embed_size=self.embed_size,
num_tags=len(self.label_list), max_len=self.max_seq_len, device=self.device,
dense_layer_type=self.dense_layer_type, dropout=self.dropout, embed_type=self.embed_type,
model_name_or_path=self.model_name_or_path, vector_file=self.vector_file)
model.to(self.device)
y_preds = []
for model_state_path in glob(os.path.join(self.output_dir, '*{}*.pt*'.format(self.model_name))):
model.load_state_dict(torch.load(model_state_path))
y_pred = self.single_predict(model, dataloader)
y_preds.append(y_pred)
y_preds = torch.tensor(y_preds)
y_pred = torch.mode(y_preds, dim=0).values
y_pred = y_pred.numpy()
preds_list = [[] for _ in range(all_label_mask_ids.shape[0])]
for i in range(all_label_mask_ids.shape[0]):
for j in range(all_label_mask_ids.shape[1]):
if all_label_mask_ids[i, j] != -100:
preds_list[i].append(self.label_list[y_pred[i][j]])
return preds_list
def knn_predict(feature, feature_bank, feature_labels, classes, knn_k, knn_t):
# compute cos similarity between each feature vector and feature bank ---> [B, N]
preds = []
sim_matrix = torch.mm(feature, feature_bank)
# [B, K]
sim_weight, sim_indices = sim_matrix.topk(k=knn_k, dim=-1)
# [B, K]
sim_labels = torch.gather(feature_labels.expand(feature.size(0), -1),
dim=-1,
index=sim_indices)
for row in tqdm(sim_labels):
if len(torch.unique(row)) == len(row):
preds.append(row[0].item())
else:
preds.append(torch.mode(row)[0].item())
preds = torch.tensor(preds)
print((preds == gt_labels).sum() / 50000)
sim_weight = (sim_weight / knn_t).exp()
# counts for each class
one_hot_label = torch.zeros(feature.size(0) * knn_k, classes)
# [B*K, C]
one_hot_label = one_hot_label.scatter(dim=-1,
index=sim_labels.view(-1, 1),
value=1.0)
# weighted score ---> [B, C]
# pred_scores = torch.sum(one_hot_label.view(feature.size(0), -1, classes) * sim_weight.unsqueeze(dim=-1), dim=1)
pred_scores = torch.sum(one_hot_label.view(feature.size(0), -1, classes),
dim=1)
pred_labels = pred_scores.argsort(dim=-1, descending=True)
return (pred_labels[:, 0] == gt_labels).sum() / 50000
def ensemble_result(args,G_list,F_list, im_data,alphas):
predictions = torch.tensor(np.zeros((len(G_list),im_data.shape[0]))).cuda()
count = 0
#based on whether or not alphas is None or an array, pick how we use the
#classifier outputs
#print("im_data shape: ", im_data.shape)
#print("predictions shape: ", predictions.shape)
pred = []
if (alphas is None):
for G,F in zip(G_list,F_list):
feat = G(im_data)
output = F(feat)
predictions[count,:]=output.data.max(1)[1]
count+=1
#majority voting
pred = torch.mode(predictions,0)
pred = pred.values
else:
#print("Alphas: " , alphas, " adaboost eval")
output_overall = []
for G,F in zip(G_list,F_list):
feat = G(im_data)
output = F(feat)
if (count == 0):
output_overall = alphas[count]*output.data
count+=1
else:
output_overall+= alphas[count]*output.data
count+=1
pred = output_overall.max(1)[1]
return pred
def test_cifar(args, Z, names, arch):
_, test_loader = datagen.load_cifar(args)
criterion = nn.CrossEntropyLoss()
pop_size = args.batch_size
with torch.no_grad():
correct = 0.
test_loss = 0
for data, target in test_loader:
data, target = data.cuda(), target.cuda()
outputs = []
for i in range(pop_size):
params = [Z[0][i], Z[1][i], Z[2][i], Z[3][i], Z[4][i]]
model = weights_to_clf(params, names, arch)
output = model(data)
outputs.append(output)
pop_outputs = torch.stack(outputs)
pop_labels = pop_outputs.max(2, keepdim=True)[1].view(
pop_size, 100, 1)
modes, idxs = torch.mode(pop_labels, dim=0, keepdim=True)
modes = modes.view(100, 1)
correct += modes.eq(target.data.view_as(modes)).long().cpu().sum()
test_loss += criterion(output, target).item() # sum up batch loss
test_loss /= len(test_loader.dataset)
acc = (correct.float() / len(test_loader.dataset)).item()
return acc, test_loss
def predict(self, x_test: Tensor):
"""
Predict the most likely class for each sample in a given tensor.
:param x_test: Tensor of shape (N,D) where N is the number of samples.
:return: A tensor of shape (N,) containing the predicted classes.
"""
# Calculate distances between training and test samples
dist_matrix = self.calc_distances(x_test)
# For each training sample we'll look for it's k-nearest neighbors.
# Then we'll predict the label of that sample to be the majority
# label of it's nearest neighbors.
n_test = x_test.shape[0]
y_pred = torch.zeros(n_test, dtype=torch.int64)
for i in range(n_test):
# - Find indices of k-nearest neighbors of test sample i
# - Set y_pred[i] to the most common class among them
# ====== YOUR CODE: ======
cur_dists = dist_matrix[:, i]
_, top_idx = torch.topk(cur_dists, self.k, largest=False)
top_classes = self.y_train[top_idx]
y_pred[i] = torch.mode(top_classes)[0].item()
# ========================
return y_pred
def generate_candidate_frames(img, spacing=6, sigma=9, blur_sigma=15, contrast=1.2, downsample=8, use_mode=False):
"""
Generate the candidates frames used to compute saliencies (I')
using masks representing Gaussian perturbations with spaced every `spacing steps
`
output_i = mask_i * blurred_img + (1-mask_i) * img
:param img: input image
:param spacing: space between each perturbation
:param sigma: scale of the perturbations
:param blur_sigma: scale of the gaussian noise to blur the image
:param contrast: contrast for the final mask values (mask = torch.clamp(contrast * mask, 0, 1))
:param downsample: downsampling size
:param use_mode: use color mode of the input image instead of the blurred version (mode = background color)
:return: candidate frames to compute saliency
"""
masks = generate_mask(img.shape[2:], spacing, sigma, downsample=downsample, contrast=contrast)
if use_mode:
mode, _ = torch.mode(img.transpose(1, 0).view(4, -1), -1)
blurred_img = mode[None, :, None, None].expand_as(img)
else:
blurred_img = blur_image(img.float(), blur_sigma, downsample)
outputs = (masks) * blurred_img + (1 - masks) * img.float()
return outputs, masks
def make_seg_labels(self, seg):
zeros = torch.zeros(seg.shape).cuda()
noises = torch.rand(seg.shape).cuda()
per = torch.where(seg == 0, noises, zeros)
seg_labels = torch.mode(per + seg, dim=-2)[0]
seg_labels[seg_labels < 1] = 0
return seg_labels
def validate(model, test_loader, use_cuda, criterion):
# validation -- this is a crude estimation because there might be some paddings at the end
correct_cnt = 0.0
model.eval()
for it, test_data in enumerate(test_loader):
vote = []
for data_dic in test_data:
if use_cuda:
imgs, labels = Variable(
data_dic['image'],
volatile=True).cuda(), Variable(data_dic['label'],
volatile=True).cuda()
else:
imgs, labels = Variable(data_dic['image'],
volatile=True), Variable(
data_dic['label'], volatile=True)
test_output = model(imgs)
_, predict = test_output.topk(1)
vote.append(predict)
vote = torch.cat(vote, 1)
final_vote, _ = torch.mode(vote, 1)
ground_truth = test_data[0]['label']
correct_this_batch = (final_vote.cpu().data == ground_truth).sum()
correct_cnt += correct_this_batch
accuracy = float(correct_this_batch) / len(ground_truth)
logging.info("batch {0} dev accuracy is : {1:.5f}".format(
it, accuracy))
return correct_cnt
def generate_start_pos(self):
if isinstance(self.START_POS, torch.Tensor):
return self.START_POS
startpos = self.START_POS.sample()
sample_one_agent = False
if len(startpos.shape) == 1:
startpos = torch.stack(
[self.START_POS.sample() for _ in range(self.N_AGENTS)], dim=0)
sample_one_agent = True
codist = self.get_relative_position(startpos).norm(dim=2)
codist.diagonal().fill_(float('inf'))
while torch.any(codist < 2 * self.AGENT_RADIUS):
collisions = codist < 2 * self.AGENT_RADIUS
idxs = []
while torch.sum(collisions) != 0:
idx = torch.mode(torch.where(collisions)[0])[0]
idxs.append(idx)
collisions[idx, :] = 0
collisions[:, idx] = 0
idxs = torch.tensor(idxs)
if sample_one_agent:
for idx in idxs:
startpos[idx, :] = self.START_POS.sample()
else:
startposnew = self.START_POS.sample()
startpos[idxs, :] = startposnew[idxs, :]
codist = self.get_relative_position(startpos).norm(dim=2)
codist.diagonal().fill_(float('inf'))
return startpos
def predict(self, x_test: Tensor):
"""
Predict the most likely class for each sample in a given tensor.
:param x_test: Tensor of shape (N,D) where N is the number of samples.
:return: A tensor of shape (N,) containing the predicted classes.
"""
# Calculate distances between training and test samples
dist_matrix = l2_dist(self.x_train, x_test)
# TODO:
# Implement k-NN class prediction based on distance matrix.
# For each training sample we'll look for it's k-nearest neighbors.
# Then we'll predict the label of that sample to be the majority
# label of it's nearest neighbors.
n_test = x_test.shape[0]
y_pred = torch.zeros(n_test, dtype=torch.int64)
for i in range(n_test):
# TODO:
# - Find indices of k-nearest neighbors of test sample i
# - Set y_pred[i] to the most common class among them
# - Don't use an explicit loop.
# ====== YOUR CODE: ======
_, indices = torch.topk(dist_matrix[:, i], largest=False, k=self.k)
y_pred[i], _ = torch.mode(self.y_train[indices])
# ========================
return y_pred
def classify(self, X_que, y_pool, X_pool, k=5):
n_que = X_que.shape[0]
y_pred = th.zeros(n_que, device=self.device, dtype=th.int)
for i in range(n_que):
ranks = self.rank(X_que[i], X_pool)
y_pred[i] = th.mode(y_pool[ranks[0:k]])[0].int()
return y_pred
def test(args, model, device, test_loader, criterion, batch_size, num_labels):
conf_mat = np.zeros((num_labels, num_labels))
model.eval()
test_loss = 0
correct = 0
with torch.no_grad():
for inputs, labels in test_loader:
inputs, labels = inputs.float().to(device), labels.long().to(
device)
passes_pred = []
for _ in range(args.inference_passes):
output = model(inputs)
test_loss += criterion(
output, labels).sum().item() # sum up batch loss
passes_pred.append(output.argmax(dim=1, keepdim=True))
pred = torch.mode(torch.cat(passes_pred, dim=1),
dim=1,
keepdim=True)[0]
correct += pred.eq(labels.view_as(pred)).sum().item()
conf_mat += confusion_matrix(labels.cpu().numpy(),
pred.cpu().numpy(),
labels=range(num_labels))
test_loss /= len(test_loader.dataset)
print(
'\nTest set: Average loss: {:.4f}, Accuracy: {}/{} ({:.2f}%)\n'.format(
test_loss, correct, len(test_loader.dataset),
100. * correct / len(test_loader.dataset)))
print("Confusion Matrix:\n", np.int_(conf_mat))
def forward(self, x):
x = x.double()
if self.kernel == "linear":
k = torch.mm(x, self.sv_t)
elif self.kernel == "rbf":
# using quadratic expansion--susseptible to rounding-off errors
# http://www.robots.ox.ac.uk/~albanie/notes/Euclidean_distance_trick.pdf
x_norm = -self.gamma * (x ** 2).sum(1).view(-1, 1)
k = torch.exp(x_norm + self.sv_norm + 2.0 * self.gamma * torch.mm(x, self.sv_t))
elif self.kernel == "sigmoid":
k = torch.sigmoid(self.gamma * torch.mm(x, self.sv_t) + self.coef0)
else: # poly kernel
k = torch.pow(self.gamma * torch.mm(x, self.sv_t) + self.coef0, self.degree)
c = [
sum(self.a[i, p] * k[:, p : p + 1] for p in range(self.start[j], self.end[j]))
+ sum(self.a[j - 1, p] * k[:, p : p + 1] for p in range(self.start[i], self.end[i]))
for i in range(self.len_nv)
for j in range(i + 1, self.len_nv)
]
c = torch.cat(c, dim=1) + self.b
if self.n_classes == 2:
class_ids = torch.gt(c, 0.0).int().flatten()
else:
votes = torch.where(c > 0, self.true_classes, self.false_classes)
# TODO mode is still not implemented for GPU backend
votes = votes.data.cpu()
class_ids, _ = torch.mode(votes, dim=1)
# no class probabilities in SVC
if self.perform_class_select:
temp = torch.index_select(self.classes, 0, class_ids.long())
return temp, temp
else:
return class_ids, class_ids
def predict(self, unlabeled_path, start_time, train_time):
all_input_ids, all_token_type_ids, \
all_attention_mask, all_label_ids = self.get_X_y_ids(unlabeled_path)
dataset = TensorDataset(all_input_ids, all_token_type_ids,
all_attention_mask)
batch_size = self.n_gpu * self.per_gpu_batch_size
dataloader = DataLoader(dataset=dataset,
batch_size=batch_size,
shuffle=False)
model = CLS_Model(vocab_size=self.bert_tokenizer.vocab_size,
embed_size=self.embed_size,
num_labels=len(self.label_list),
dense_layer_type=self.dense_layer_type,
dropout=self.dropout,
embed_type=self.embed_type,
max_len=self.max_seq_len,
model_name_or_path=self.model_name_or_path,
vector_file=self.vector_file)
model.to(self.device)
y_preds = []
for model_state_path in glob(
os.path.join(self.output_dir,
'*{}*.pt*'.format(self.model_name))):
model.load_state_dict(torch.load(model_state_path))
y_pred = self.single_predict(model, dataloader)
y_preds.append(y_pred)
y_preds = torch.tensor(y_preds)
y_pred = torch.mode(y_preds, dim=0).values
y_pred = y_pred.numpy()
report = classification_report(y_true=all_label_ids.numpy(),
y_pred=y_pred,
digits=4)
predix = os.path.split(unlabeled_path)[-1].replace(".csv", "")
score_file = os.path.join(
self.output_dir, 'score_{}_{}.txt'.format(predix, self.model_name))
data_df = pd.read_csv(unlabeled_path,
names=["q1", "q2", "label", "topic"])
data_df['pred'] = y_pred
data_df.to_csv(os.path.join(
self.output_dir, 'pred_{}_{}.csv'.format(predix, self.model_name)),
index=False)
with open(score_file, 'w', encoding="utf-8") as w:
w.write(report)
w.write("\n")
w.write("train time cost:\t {:.2f} s".format(train_time))
w.write("\n")
w.write("time cost:\t {:.2f} s".format(time.time() - start_time -
train_time))
w.write("\n")
w.write("args:\n{}".format('\n'.join(
['%s:%s' % item for item in self.__dict__.items()])))
def get_ins_list(sem_pred,
center_pred,
offset_pred,
thing_list,
threshold=0.1,
nms_kernel=7,
top_k=None):
""" get instance list from prediction results.
Args:
sem_pred: tensor of size [1, C, H, W]. sementic segmentation prediction.
center_pred: tensor of size [1, 1, H, W]. center heatmap prediction.
offset_pred: tensor of size [1, 2, H, W]. offset prediction.
thing_list: List of thing class ids (int). things can be instance and belongs to foregound.
threshold: float. threshold for center_pred activation.
nms_kernel: int. max pooling kernel size for filtering center activations.
top_k: int. number of center points to be preserved from predicted center heatmap.
Returns:
ins_list: list of dictionary. e.g.
{'class_id': 13, 'mask': nparray of size (h, w) , 'score': 0.9876}
center_points: list of center points
Raises:
AssertionError: check prediction maps' dimension.
"""
# Check argument validity
assert sem_pred.dim() == 4 and sem_pred.size(0) == 1
assert center_pred.dim() == 4 and center_pred.size(0) == 1
assert offset_pred.dim() == 4 and offset_pred.size(0) == 1
sem_soft = F.softmax(sem_pred, dim=1) # normalize prediction scores
# sem_soft [1, C, H, W] -> sem_hard [1, H, W]
sem_hard = get_semantic_segmentation(sem_soft)
ins_seg, center_points = get_instance_segmentation(sem_hard, center_pred,
offset_pred, thing_list,
threshold, nms_kernel,
top_k)
# select instance's class label by majority bote.
instance_ids = torch.unique(ins_seg)
ins_list = []
for ins_id in instance_ids:
instance = {}
if ins_id == 0:
continue
#majority voting
ins_mask = (ins_seg == ins_id)
class_id, _ = torch.mode(sem_hard[ins_mask].view(-1, ))
instance['class_id'] = class_id.item()
# get polygon from binary instance mask
instance['mask'] = ins_mask.squeeze(0).cpu().numpy()
# Compute confidence score
score_sum = torch.sum(sem_soft[:, class_id, :, :] * ins_mask)
score_mean = score_sum / torch.sum(ins_mask)
instance['score'] = score_mean.item()
ins_list.append(instance)
if not ins_list:
raise RuntimeError('mage has no detected instance.')
return ins_list, center_points
def pred_helper(output):
pred = torch.zeros(output[0].size(0), len(output))
for k in range(len(output)): #nemo
curr_pred = output[k].argmax(dim=-1)
val, _ = torch.mode(curr_pred, dim=1)
pred[:, k] = val
return pred
def merge_semantic_and_instance(sem_seg, ins_seg, label_divisor, thing_list,
stuff_area, void_label):
"""
Post-processing for panoptic segmentation, by merging semantic segmentation label and class agnostic
instance segmentation label.
Arguments:
sem_seg: A Tensor of shape [1, H, W], predicted semantic label.
ins_seg: A Tensor of shape [1, H, W], predicted instance label.
label_divisor: An Integer, used to convert panoptic id = semantic id * label_divisor + instance_id.
thing_list: A List of thing class id.
stuff_area: An Integer, remove stuff whose area is less tan stuff_area.
void_label: An Integer, indicates the region has no confident prediction.
Returns:
A Tensor of shape [1, H, W] (to be gathered by distributed data parallel).
Raises:
ValueError, if batch size is not 1.
"""
# In case thing mask does not align with semantic prediction
pan_seg = torch.zeros_like(sem_seg) + void_label
thing_seg = ins_seg > 0
semantic_thing_seg = torch.zeros_like(sem_seg)
for thing_class in thing_list:
semantic_thing_seg[sem_seg == thing_class] = 1
# keep track of instance id for each class
class_id_tracker = {}
# paste thing by majority voting
instance_ids = torch.unique(ins_seg)
for ins_id in instance_ids:
if ins_id == 0:
continue
# Make sure only do majority voting within semantic_thing_seg
thing_mask = (ins_seg == ins_id) & (semantic_thing_seg == 1)
if torch.nonzero(thing_mask).size(0) == 0:
continue
class_id, _ = torch.mode(sem_seg[thing_mask].view(-1, ))
if class_id.item() in class_id_tracker:
new_ins_id = class_id_tracker[class_id.item()]
else:
class_id_tracker[class_id.item()] = 1
new_ins_id = 1
class_id_tracker[class_id.item()] += 1
pan_seg[thing_mask] = class_id * label_divisor + new_ins_id
# paste stuff to unoccupied area
class_ids = torch.unique(sem_seg)
for class_id in class_ids:
if class_id.item() in thing_list:
# thing class
continue
# calculate stuff area
stuff_mask = (sem_seg == class_id) & (~thing_seg)
area = torch.nonzero(stuff_mask).size(0)
if area >= stuff_area:
pan_seg[stuff_mask] = class_id * label_divisor
return pan_seg
def kNNClassifer(latent_train, latent_test, k):
num_each_class = latent_train.shape[0] / 10
latent_test = latent_test.unsqueeze(1).repeat(1, latent_train.shape[0], 1)
distance = ((latent_test - latent_train)**2).sum(
dim=2) # shape=(num_sample, num_base_sample)
_, index = torch.topk(distance, k, dim=1) # index shape=(num_sample, k)
index = index // num_each_class
pred, _ = torch.mode(index, dim=1)
return pred
def _get_point_cloud(self, depth):
height = depth.shape[0]
width = depth.shape[1]
#val,counts = torch.unique(depth, return_counts=True)
#table_val = val[counts.argmax()]
table_val, _ = torch.mode(torch.flatten(depth), 0)
if self.xmap is None:
self.xmap = torch.tensor([[j for i in range(width)]
for j in range(height)],
dtype=torch.float)
self.ymap = torch.tensor([[i for i in range(width)]
for j in range(height)],
dtype=torch.float)
# ducktape fix to filter blue box out of point cloud
choose_mask = (depth < table_val)
choose_mask[164:, :31] = 0
choose = torch.flatten(choose_mask).nonzero().flatten()
#choose = (torch.flatten(depth) < table_val).nonzero().flatten()
# take random 500 points
idx = np.random.choice(choose.shape[0], size=500)
choose = choose[idx]
depth_masked = depth.flatten()[choose]
xmap_masked = self.xmap.flatten()[choose]
ymap_masked = self.ymap.flatten()[choose]
fovy = 45.0
#f = height / math.tan(fovy * math.pi / 360)
# should be height from ground not ... pixels???
f = height / math.tan(fovy * math.pi / 360)
cam_scale = 0.1
f /= cam_scale
cam = np.array(((f, 0, width / 2), (0, f, height / 2), (0, 0, 1)))
cx = height / 2
cy = width / 2
pt2 = depth_masked / cam_scale
#pt2 = depth_masked / 0.1
pt0 = (ymap_masked - cx) * pt2 / f
pt1 = (xmap_masked - cy) * pt2 / f
#pt2 = pt2/0.1
cloud = torch.cat((pt1[:, None], -pt0[:, None], pt2[:, None]), dim=1)
# turn depths into coords by subtracting from camera
# -0.13 0.6 0.6
# 0 0.55 0.48
cloud[:, 0] = 0. + cloud[:, 0]
cloud[:, 1] = 0.6 + cloud[:, 1]
cloud[:, 2] = (table_val / 0.1) - cloud[:, 2] + 0.02
choose = choose.view(1, -1)
return choose, cloud