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trainer.py
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trainer.py
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import torch
import torch.nn as nn
import torch.nn.functional as F
from torch.autograd import Variable
import os
import h5py
import numpy as np
from model import MotionGen, MotionDis, Gaussian_P_Z
from utils import unNormalizeData_tensor_batch, get_model_list, \
get_scheduler, lerp, slerp, prepare_next_batch, expmap_to_quaternion
import logging
logger = logging.getLogger(__name__)
class Trainer(nn.Module):
def __init__(self, skeleton, config):
super(Trainer, self).__init__()
self.skeleton = skeleton
self.lr = config['lr']
self.lr_decay = config['lr_decay']
self.gradient_clip = config['gradient_clip']
self.seq_len = config['seq_len']
self.n_joints = config['n_joints']
self.z_dim = config['z_dim']
self.model_dir = config['model_dir']
# Initiate the networks
self.gen = MotionGen(config['input_size'], self.seq_len, config['z_dim'], config['gen'])
self.dis = MotionDis(config['input_size'], config['dis'])
# Setup the optimizers
gen_params = list(self.gen.parameters())
dis_params = list(self.dis.parameters())
self.gen_opt = torch.optim.Adam([p for p in gen_params if p.requires_grad], lr=self.lr)
self.dis_opt = torch.optim.Adam([p for p in dis_params if p.requires_grad], lr=self.lr)
self.gen_scheduler = torch.optim.lr_scheduler.ExponentialLR(self.gen_opt, 0.999)
self.dis_scheduler = torch.optim.lr_scheduler.ExponentialLR(self.dis_opt, 0.999)
self.device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
if torch.cuda.is_available():
self.gen.to(self.device)
self.dis.to(self.device)
def forward(self, m, m_flip):
self.eval()
z = self.gen.encode(m)
m_recon_flip, m_recon_vel_flip = self.gen.decode(z)
self.train()
return m_recon_flip, m_recon_vel_flip
def recon_criterion(self, input_seq, target_seq):
# 3 for exp. 4 for quaternion
return torch.mean((input_seq.view(input_seq.shape[0], input_seq.shape[1], -1, 3)
- target_seq.view(target_seq.shape[0], target_seq.shape[1], -1, 3)).norm(dim=3))
def fk_criterion(self, input_exp, target_pos, root_trajectory,
exp_mean, exp_std, exp_dimTouse,
pos_mean, pos_std, pos_dimTouse):
""" Compute forward kinematics for fk loss
Args:
(where N = batch size, L = sequence length, J = number of joints):
input_exp: (N, L, J, 3) tensor describing the joint exp coordinates.
target_pos: (N, L, J, 3) tensor describing the joint pos coordinates.
Returns:
loss_fk
"""
input_un = unNormalizeData_tensor_batch(input_exp, exp_mean, exp_std, exp_dimTouse)
input_un = input_un.view(input_un.shape[0], input_un.shape[1], -1, 3)
input_pos = self.skeleton.forward_kinematics_exp(input_un, root_trajectory)
input_pos = input_pos.contiguous().view(input_pos.shape[0], input_pos.shape[1], -1)
nm_input_pos = torch.div((input_pos - pos_mean), pos_std)
nm_input_pos = nm_input_pos[:, :, pos_dimTouse]
# Euclidean distance (with joint-wise square root, not MSE!)
nm_input_pos = nm_input_pos.view(nm_input_pos.shape[0], nm_input_pos.shape[1], -1, 3)
nm_target_pos = target_pos.view(target_pos.shape[0], target_pos.shape[1], -1, 3)
loss_fk = torch.mean((nm_input_pos - nm_target_pos).norm(dim=3))
return loss_fk
def __compute_MMD(self, z):
p_z = Gaussian_P_Z(z.size(1))
sample_Pz = p_z.sample(z.size(0))
# sample_Pz = sample_Pz.to(z.data.get_device())
sample_Pz = sample_Pz.to(self.device)
n_ = z.size(0)
C_base = 2. * z.size(1) * 1
z_dot_z = torch.mm(sample_Pz, sample_Pz.transpose(0, 1))
z_tilde_dot_z_tilde = torch.mm(z, z.transpose(0, 1))
z_dot_z_tilde = torch.mm(sample_Pz, z.transpose(0, 1))
dist_z_z = (torch.unsqueeze(torch.diagonal(z_dot_z, 0), 1) \
+ torch.unsqueeze(torch.diagonal(z_dot_z, 0), 0)) \
- 2 * z_dot_z
dist_z_tilde_z_tilde = (torch.unsqueeze(torch.diagonal(z_tilde_dot_z_tilde, 0), 1)
+ torch.unsqueeze(torch.diagonal(z_tilde_dot_z_tilde, 0), 0)) \
- 2 * z_tilde_dot_z_tilde
dist_z_z_tilde = (torch.unsqueeze(torch.diagonal(z_dot_z, 0), 1)
+ torch.unsqueeze(torch.diagonal(z_tilde_dot_z_tilde, 0), 0)) \
- 2 * z_dot_z_tilde
loss_z = 0
# for scale in [1.0]:
for scale in [.1, .2, .5, 1., 2., 5., 10.]:
C = C_base * scale
k_z = \
C / (C + dist_z_z + 1e-8)
k_z_tilde = \
C / (C + dist_z_tilde_z_tilde + 1e-8)
k_z_z_tilde = \
C / (C + dist_z_z_tilde + 1e-8)
loss = 1 / (n_ * (n_ - 1)) * torch.sum(k_z) \
+ 1 / (n_ * (n_ - 1)) * torch.sum(k_z_tilde) \
- 2 / (n_ * n_) * torch.sum(k_z_z_tilde)
loss_z += loss
loss_z = loss_z.mean()
return loss_z
def gen_update(self, data, exp_mean, exp_std, exp_dimTouse, \
pos_mean, pos_std, pos_dimTouse, config):
self.gen.train()
eps = 1e-15
# motion data
m_exp = data['motion_exp'].to(self.device).detach() # input: (batch, seq, dim)
m_exp_flip = data['motion_exp_flip'].to(self.device).detach()
m_pos_flip = data['motion_pos_flip'].to(self.device).detach()
m_tra_flip = data['motion_tra_flip'].to(self.device).detach()
# mean, std
exp_mean = torch.from_numpy(exp_mean).to(self.device).detach()
exp_std = torch.from_numpy(exp_std).to(self.device).detach()
pos_mean = torch.from_numpy(pos_mean).to(self.device).detach()
pos_std = torch.from_numpy(pos_std).to(self.device).detach()
# encode
z = self.gen.encode(m_exp)
# decode
m_exp_recon_flip, m_exp_recon_vel_flip = self.gen.decode(z=z)
# encode again
z_recon = self.gen.encode(torch.flip(m_exp_recon_flip, [1]))
z_recon_vel = self.gen.encode(torch.flip(m_exp_recon_vel_flip, [1]))
# update loss metric
losses_gen = {}
# reconstruction loss
losses_gen['loss_gen_recon'] = config['recon_x_w'] * self.recon_criterion(m_exp_recon_flip, m_exp_flip)
losses_gen['loss_gen_recon_vel'] = config['recon_x_w'] * self.recon_criterion(m_exp_recon_vel_flip, m_exp_flip)
# regularizer loss
losses_gen['loss_gen_z'] = config['recon_z_w'] * self.__compute_MMD(z)
# GAN loss
if config['gan_w'] > 0:
losses_gen['loss_gen_adv'] = config['gan_w'] * self.dis.calc_gen_loss(m_exp_recon_flip)
losses_gen['loss_gen_adv_vel'] = config['gan_w'] * self.dis.calc_gen_loss(m_exp_recon_vel_flip)
# latent regression loss
if config['recon_z_reg_w'] > 0:
losses_gen['loss_gen_z_recon'] = config['recon_z_reg_w'] * torch.mean(torch.abs(z_recon - z))
losses_gen['loss_gen_z_recon_vel'] = config['recon_z_reg_w'] * torch.mean(torch.abs(z_recon_vel - z))
# FK loss
if config['recon_fk_w'] > 0:
losses_gen['loss_gen_fk'] = config['recon_fk_w'] * \
self.fk_criterion(m_exp_recon_flip, m_pos_flip, m_tra_flip,
exp_mean, exp_std, exp_dimTouse,
pos_mean, pos_std, pos_dimTouse)
losses_gen['loss_gen_fk_vel'] = config['recon_fk_w'] * \
self.fk_criterion(m_exp_recon_vel_flip, m_pos_flip, m_tra_flip,
exp_mean, exp_std, exp_dimTouse,
pos_mean, pos_std, pos_dimTouse)
loss_gen_total = sum(losses_gen.values())
self.gen_opt.zero_grad()
loss_gen_total.backward()
self.gen_opt.step()
return losses_gen
def dis_update(self, data, config):
self.dis.train()
# data
motions_exp = data['motion_exp'].to(self.device).detach()
motions_exp_flip = data['motion_exp_flip'].to(self.device).detach()
# encode
z = self.gen.encode(motions_exp)
# decode
m_recon_flip, m_recon_vel_flip = self.gen.decode(z)
# update loss metric
losses_dis = {}
# D loss
losses_dis['loss_dis_rot'] = config['gan_w'] * self.dis.calc_dis_loss(m_recon_flip.detach(), motions_exp_flip)
losses_dis['loss_dis_vel'] = config['gan_w'] * self.dis.calc_dis_loss(m_recon_vel_flip.detach(), motions_exp_flip)
loss_dis_total = sum(losses_dis.values())
self.dis_opt.zero_grad()
loss_dis_total.backward()
self.dis_opt.step()
return losses_dis
def test_loss (self, data, exp_mean, exp_std, exp_dimTouse, \
pos_mean, pos_std, pos_dimTouse):
self.gen.eval()
with torch.no_grad():
# motion data
m_exp = data['motion_exp'].to(self.device).detach() # input: (batch, seq, dim)
m_exp_flip = data['motion_exp_flip'].to(self.device).detach()
m_pos_flip = data['motion_pos_flip'].to(self.device).detach()
m_tra_flip = data['motion_tra_flip'].to(self.device).detach()
# mean, std
exp_mean = torch.from_numpy(exp_mean).to(self.device).detach()
exp_std = torch.from_numpy(exp_std).to(self.device).detach()
pos_mean = torch.from_numpy(pos_mean).to(self.device).detach()
pos_std = torch.from_numpy(pos_std).to(self.device).detach()
# encode
z = self.gen.encode(m_exp)
# decode
m_exp_recon_flip, m_exp_recon_vel_flip = self.gen.decode(z=z)
# encode again
z_recon = self.gen.encode(torch.flip(m_exp_recon_flip, [1]))
z_recon_vel = self.gen.encode(torch.flip(m_exp_recon_vel_flip, [1]))
# update loss metric
losses_gen = {}
# # reconstruction loss
losses_gen['loss_gen_recon'] = self.recon_criterion(m_exp_recon_flip, m_exp_flip)
losses_gen['loss_gen_recon_vel'] = self.recon_criterion(m_exp_recon_vel_flip, m_exp_flip)
# # regularizer loss
losses_gen['loss_gen_z'] = self.__compute_MMD(z)
# latent regression loss
losses_gen['loss_gen_z_recon'] = torch.mean(torch.abs(z_recon - z))
losses_gen['loss_gen_z_recon_vel'] = torch.mean(torch.abs(z_recon_vel - z))
return losses_gen
def test_motion(self, data, exp_mean, exp_std, exp_dimTouse, out_representation='rotations'):
self.gen.eval()
with torch.no_grad():
m_ = data['motion_exp'].to(self.device).detach()
m_flip = data['motion_exp_flip'].to(self.device).detach() # input: (batch, seq, dim)
root_trajectory_flip = data['motion_tra_flip'].to(self.device).detach() # input: (batch, seq, dim)
# mean, std
exp_mean = torch.from_numpy(exp_mean).to(self.device).detach()
exp_std = torch.from_numpy(exp_std).to(self.device).detach()
# encode
z = self.gen.encode(m_)
# decode
m_recon_flip, m_recon_vel_flip = self.gen.decode(z=z)
# unnormalize
m_recon_flip_un = unNormalizeData_tensor_batch(m_recon_flip, exp_mean, exp_std, exp_dimTouse)
m_recon_vel_flip_un = unNormalizeData_tensor_batch(m_recon_vel_flip, exp_mean, exp_std, exp_dimTouse)
m_flip_un = unNormalizeData_tensor_batch(m_flip, exp_mean, exp_std, exp_dimTouse)
if out_representation == 'positions_world':
# forward kinematics
m_recon_flip_un = m_recon_flip_un.view(m_recon_flip_un.shape[0], m_recon_flip_un.shape[1], -1, 3)
m_recon_flip_xyz = self.skeleton.forward_kinematics_exp(m_recon_flip_un, root_trajectory_flip)
m_recon_vel_flip_un = m_recon_vel_flip_un.view(m_recon_vel_flip_un.shape[0], m_recon_vel_flip_un.shape[1], -1, 3)
m_recon_vel_flip_xyz = self.skeleton.forward_kinematics_exp(m_recon_vel_flip_un, root_trajectory_flip)
m_flip_un = m_flip_un.view(m_flip_un.shape[0], m_flip_un.shape[1], -1, 3)
m_flip_xyz = self.skeleton.forward_kinematics_exp(m_flip_un, root_trajectory_flip)
# reverse
m_recon_flip_np = m_recon_flip_xyz.data.cpu().numpy()
m_recon_np = np.flip(m_recon_flip_np, 1)
m_recon_vel_flip_np = m_recon_vel_flip_xyz.data.cpu().numpy()
m_recon_vel_np = np.flip(m_recon_vel_flip_np, 1)
m_flip_np = m_flip_xyz.data.cpu().numpy()
m_np = np.flip(m_flip_np, 1)
elif out_representation == 'rotations_exp':
# reverse
m_recon_flip_np = m_recon_flip_un.data.cpu().numpy()
m_recon_np = np.flip(m_recon_flip_np, 1)
m_recon_vel_flip_np = m_recon_vel_flip_un.data.cpu().numpy()
m_recon_vel_np = np.flip(m_recon_vel_flip_np, 1)
m_flip_np = m_flip_un.data.cpu().numpy()
m_np = np.flip(m_flip_np, 1)
elif out_representation == 'rotations': # quaternion
# reverse
m_recon_flip_np = m_recon_flip_un.data.cpu().numpy()
m_recon_np = np.flip(m_recon_flip_np, 1)
m_recon_np = m_recon_np.reshape(m_recon_np.shape[0], m_recon_np.shape[1], -1, 3)
m_recon_np = expmap_to_quaternion(m_recon_np)
m_recon_vel_flip_np = m_recon_vel_flip_un.data.cpu().numpy()
m_recon_vel_np = np.flip(m_recon_vel_flip_np, 1)
m_recon_vel_np = m_recon_vel_np.reshape(m_recon_vel_np.shape[0], m_recon_vel_np.shape[1], -1, 3)
m_recon_vel_np = expmap_to_quaternion(m_recon_vel_np)
m_flip_np = m_flip_un.data.cpu().numpy()
m_np = np.flip(m_flip_np, 1)
m_np = m_np.reshape(m_np.shape[0], m_np.shape[1], -1, 3)
m_np = expmap_to_quaternion(m_np)
return m_recon_np, m_recon_vel_np, m_np
def random_sample(self, n_samples, exp_mean, exp_std, exp_dimTouse, out_representation='rotations'):
self.gen.eval()
with torch.no_grad():
# mean, std
exp_mean = torch.from_numpy(exp_mean).to(self.device).detach()
exp_std = torch.from_numpy(exp_std).to(self.device).detach()
# for sampling
p_z = Gaussian_P_Z(self.z_dim)
sample_Pz = p_z.sample(n_samples)
sample_Pz = sample_Pz.to(self.device)
# decode
m_recon_flip, m_recon_vel_flip = self.gen.decode(z=sample_Pz)
m_recon_flip_un = unNormalizeData_tensor_batch(m_recon_flip, exp_mean, exp_std, exp_dimTouse)
m_recon_vel_flip_un = unNormalizeData_tensor_batch(m_recon_vel_flip, exp_mean, exp_std, exp_dimTouse)
# reverse
m_recon_flip_np = m_recon_flip_un.data.cpu().numpy()
m_recon_np = np.flip(m_recon_flip_np, 1)
m_recon_np = m_recon_np.reshape(m_recon_np.shape[0], m_recon_np.shape[1], -1, 3)
m_recon_np = expmap_to_quaternion(m_recon_np)
m_recon_vel_flip_np = m_recon_vel_flip_un.data.cpu().numpy()
m_recon_vel_np = np.flip(m_recon_vel_flip_np, 1)
m_recon_vel_np = m_recon_vel_np.reshape(m_recon_vel_np.shape[0], m_recon_vel_np.shape[1], -1, 3)
m_recon_vel_np = expmap_to_quaternion(m_recon_vel_np)
return m_recon_np, m_recon_vel_np
def remove_noise (self, data, exp_mean, exp_std, exp_dimTouse):
self.gen.eval()
with torch.no_grad():
m_ = data['motion_exp'].to(self.device).detach()
noise = torch.randint(low=0, high=2, size=m_.shape)
m_noise = m_ * noise
m_flip = data['motion_exp_flip'].to(self.device).detach() # input: (batch, seq, dim)
root_trajectory_flip = data['motion_tra_flip'].to(self.device).detach() # input: (batch, seq, dim)
# mean, std
exp_mean = torch.from_numpy(exp_mean).to(self.device).detach()
exp_std = torch.from_numpy(exp_std).to(self.device).detach()
# encode
z = self.gen.encode(m_noise)
# decode
m_recon_flip, m_recon_vel_flip = self.gen.decode(z=z)
# unnormalize
m_recon_flip_un = unNormalizeData_tensor_batch(m_recon_flip, exp_mean, exp_std, exp_dimTouse)
m_recon_vel_flip_un = unNormalizeData_tensor_batch(m_recon_vel_flip, exp_mean, exp_std, exp_dimTouse)
m_flip_un = unNormalizeData_tensor_batch(m_flip, exp_mean, exp_std, exp_dimTouse)
m_noise_un = unNormalizeData_tensor_batch(m_noise, exp_mean, exp_std, exp_dimTouse)
# reverse
m_recon_flip_np = m_recon_flip_un.data.cpu().numpy()
m_recon_np = np.flip(m_recon_flip_np, 1)
m_recon_np = m_recon_np.reshape(m_recon_np.shape[0], m_recon_np.shape[1], -1, 3)
m_recon_np = expmap_to_quaternion(m_recon_np)
m_recon_vel_flip_np = m_recon_vel_flip_un.data.cpu().numpy()
m_recon_vel_np = np.flip(m_recon_vel_flip_np, 1)
m_recon_vel_np = m_recon_vel_np.reshape(m_recon_vel_np.shape[0], m_recon_vel_np.shape[1], -1, 3)
m_recon_vel_np = expmap_to_quaternion(m_recon_vel_np)
m_flip_np = m_flip_un.data.cpu().numpy()
m_np = np.flip(m_flip_np, 1)
m_np = m_np.reshape(m_np.shape[0], m_np.shape[1], -1, 3)
m_np = expmap_to_quaternion(m_np)
m_noise_np = m_noise_un.data.cpu().numpy()
m_noise_np = m_noise_np.reshape(m_noise_np.shape[0], m_noise_np.shape[1], -1, 3)
m_noise_np = expmap_to_quaternion(m_noise_np)
root_trajectory_flip_np = root_trajectory_flip.data.cpu().numpy()
root_trajectory = np.flip(root_trajectory_flip_np, 1)
return m_recon_np, m_recon_vel_np, m_np, m_noise_np, root_trajectory
def update_learning_rate(self):
if self.gen_scheduler is not None:
self.gen_scheduler.step()
if self.dis_scheduler is not None:
self.dis_scheduler.step()
def save_checkpoint(self, epoch):
gen_path = os.path.join(self.model_dir, 'gen_%04d.pt' % epoch)
logger.info("saving %s", gen_path)
torch.save({'gen': self.gen.state_dict()}, gen_path)
print('Saved model at epoch %d' % epoch)
def load_checkpoint(self, model_path=None):
if not model_path:
model_dir = self.model_dir
model_path = get_model_list(model_dir, "gen") # last model
state_dict = torch.load(model_path, map_location=self.device)
self.gen.load_state_dict(state_dict['gen'])
epochs = int(model_path[-7:-3])
print('Load from epoch %d' % epochs)
return epochs