def forward(self, dist_a, dist_b, x, y, z, cls, target, ids):
if not cls.volatile:
cls.register_hook(
lambda grad: dprint('cls norm: {}', grad.data.norm()))
inds1 = [i for i, t in enumerate(target) if t.item() > 0]
inds2 = [i for i, t in enumerate(target) if not t.item() > 0]
dprint('#triplets: {} \t #class: {}', len(inds1), len(inds2))
fix = hack(inds1, inds2)
# ActorObserverLoss
final, weights = [], torch.zeros(x.shape[0], )
if len(inds1) > 0:
vars1 = var_subset([dist_a, dist_b, x, y, z, target], inds1)
vars1 += [[ids[i] for i in inds1]]
f, w = super(ActorObserverLossWithClassifier, self).forward(*vars1)
final.append(f)
for i, ii in enumerate(inds1):
weights[ii] = w[i]
# Classification loss
if len(inds2) > 0:
vars2 = var_subset([cls, -target.long()], inds2)
clsloss = self.clsloss(*vars2)
f = self.clsweight * clsloss.sum()
final.append(f)
final[0], weights = fix(final[0], weights)
dprint('losses: {}', ' '.join(['{}'.format(r.item()) for r in final]))
return sum(final), weights
def base(self, x, y, z):
base_x = self.basenet(x)
base_y = self.basenet(y)
base_z = self.basenet(z)
dist_a = F.pairwise_distance(base_x, base_y, 2).view(-1)
dist_b = F.pairwise_distance(base_y, base_z, 2).view(-1)
dprint('fc7 norms: {} \t {} \t {}', base_x.data.norm(), base_y.data.norm(), base_z.data.norm())
dprint('pairwise dist means: {} \t {}', dist_a.data.mean(), dist_b.data.mean())
return base_x, base_y, base_z, dist_a, dist_b
def forward(self, x, y, z):
""" assuming:
x: first person positive
y: third person
z: first person negative
"""
base_x = self.basenet(x)
base_y = self.basenet(y)
w_x = self.firstpos_fc(base_x).view(-1) * torch.exp(self.firstpos_scale)
w_y = self.third_fc(base_y).view(-1) * torch.exp(self.third_scale)
dprint('fc7 norms: {}\t {}', base_x.data.norm(), base_y.data.norm())
self.verbose()
return base_x, base_y, w_x, w_y
def forward(self, x):
""" assuming:
x: first person positive
y: third person
z: first person negative
"""
base_x = self.basenet(x)
y = self.classifier(base_x)
w_x = self.firstpos_fc(base_x).view(-1) * torch.exp(
self.firstpos_scale)
w_z = self.firstneg_fc(base_x).view(-1) * torch.exp(
self.firstneg_scale)
dprint('fc7 norms: {}', base_x.data.norm())
self.verbose()
return y, w_x, w_z
def forward(self, dist_a, dist_b, x, y, z, cls, target, ids):
if not cls.volatile:
cls.register_hook(lambda grad: dprint('cls norm: {}', grad.data.norm()))
inds1 = [i for i, t in enumerate(target) if t.data[0] > 0]
inds2 = [i for i, t in enumerate(target) if not t.data[0] > 0]
dprint('#triplets: {} \t #class: {}', len(inds1), len(inds2))
# Fix for avoiding degenerate autograd graph building
# that causes out of gpu memory
correction = 1.0
if len(inds1) == 0:
inds1 = [0]
correction = 0.0
# ActorObserverLoss
final, weights = [], torch.zeros(x.shape[0],)
if len(inds1) > 0:
vars1 = var_subset([dist_a, dist_b, x, y, z, target], inds1)
vars1 += [[ids[i] for i in inds1]]
f, w = super(ActorObserverLossAllWithClassifier, self).forward(*vars1)
final.append(f)
for i, ii in enumerate(inds1):
weights[ii] = w[i]
# fix
final[0] *= correction
weights *= correction
correctioncls = 1.0
if len(inds2) == 0:
inds2 = [0]
correctioncls = 0.0
# Classification loss
if len(inds2) > 0:
vars2 = var_subset([cls, -target.long()], inds2)
clsloss = self.clsloss(*vars2)
f = self.clsweight * clsloss.sum()
final.append(f)
# fix
final[1] *= correctioncls
dprint('losses: {}', ' '.join(['{}'.format(r.data[0]) for r in final]))
return sum(final), weights
def verbose(self):
dprint('scales:{}\t{}\t{}',
math.exp(self.firstpos_scale.data[0]),
math.exp(self.third_scale.data[0]),
math.exp(self.firstneg_scale.data[0]))