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| from scipy.spatial import ConvexHull | |
| import torch | |
| import torch.nn.functional as F | |
| import numpy as np | |
| from tqdm import tqdm | |
| def normalize_kp(kp_source, kp_driving, kp_driving_initial, adapt_movement_scale=False, | |
| use_relative_movement=False, use_relative_jacobian=False): | |
| if adapt_movement_scale: | |
| source_area = ConvexHull(kp_source['value'][0].data.cpu().numpy()).volume | |
| driving_area = ConvexHull(kp_driving_initial['value'][0].data.cpu().numpy()).volume | |
| adapt_movement_scale = np.sqrt(source_area) / np.sqrt(driving_area) | |
| else: | |
| adapt_movement_scale = 1 | |
| kp_new = {k: v for k, v in kp_driving.items()} | |
| if use_relative_movement: | |
| kp_value_diff = (kp_driving['value'] - kp_driving_initial['value']) | |
| kp_value_diff *= adapt_movement_scale | |
| kp_new['value'] = kp_value_diff + kp_source['value'] | |
| if use_relative_jacobian: | |
| jacobian_diff = torch.matmul(kp_driving['jacobian'], torch.inverse(kp_driving_initial['jacobian'])) | |
| kp_new['jacobian'] = torch.matmul(jacobian_diff, kp_source['jacobian']) | |
| return kp_new | |
| def headpose_pred_to_degree(pred): | |
| device = pred.device | |
| idx_tensor = [idx for idx in range(66)] | |
| idx_tensor = torch.FloatTensor(idx_tensor).to(device) | |
| pred = F.softmax(pred) | |
| degree = torch.sum(pred*idx_tensor, 1) * 3 - 99 | |
| return degree | |
| def get_rotation_matrix(yaw, pitch, roll): | |
| yaw = yaw / 180 * 3.14 | |
| pitch = pitch / 180 * 3.14 | |
| roll = roll / 180 * 3.14 | |
| roll = roll.unsqueeze(1) | |
| pitch = pitch.unsqueeze(1) | |
| yaw = yaw.unsqueeze(1) | |
| pitch_mat = torch.cat([torch.ones_like(pitch), torch.zeros_like(pitch), torch.zeros_like(pitch), | |
| torch.zeros_like(pitch), torch.cos(pitch), -torch.sin(pitch), | |
| torch.zeros_like(pitch), torch.sin(pitch), torch.cos(pitch)], dim=1) | |
| pitch_mat = pitch_mat.view(pitch_mat.shape[0], 3, 3) | |
| yaw_mat = torch.cat([torch.cos(yaw), torch.zeros_like(yaw), torch.sin(yaw), | |
| torch.zeros_like(yaw), torch.ones_like(yaw), torch.zeros_like(yaw), | |
| -torch.sin(yaw), torch.zeros_like(yaw), torch.cos(yaw)], dim=1) | |
| yaw_mat = yaw_mat.view(yaw_mat.shape[0], 3, 3) | |
| roll_mat = torch.cat([torch.cos(roll), -torch.sin(roll), torch.zeros_like(roll), | |
| torch.sin(roll), torch.cos(roll), torch.zeros_like(roll), | |
| torch.zeros_like(roll), torch.zeros_like(roll), torch.ones_like(roll)], dim=1) | |
| roll_mat = roll_mat.view(roll_mat.shape[0], 3, 3) | |
| rot_mat = torch.einsum('bij,bjk,bkm->bim', pitch_mat, yaw_mat, roll_mat) | |
| return rot_mat | |
| def keypoint_transformation(kp_canonical, he): | |
| kp = kp_canonical['value'] # (bs, k, 3) | |
| yaw, pitch, roll= he['yaw'], he['pitch'], he['roll'] | |
| yaw = headpose_pred_to_degree(yaw) | |
| pitch = headpose_pred_to_degree(pitch) | |
| roll = headpose_pred_to_degree(roll) | |
| if 'yaw_c' in he: | |
| yaw = yaw + he['yaw_c'] | |
| if 'pitch_c' in he: | |
| pitch = pitch + he['pitch_c'] | |
| if 'roll_c' in he: | |
| roll = roll + he['roll_c'] | |
| rot_mat = get_rotation_matrix(yaw, pitch, roll) # (bs, 3, 3) | |
| t, exp = he['t'], he['exp'] | |
| # keypoint rotation | |
| kp_rotated = torch.einsum('bmp,bkp->bkm', rot_mat, kp) | |
| # keypoint translation | |
| t = t.unsqueeze_(1).repeat(1, kp.shape[1], 1) | |
| kp_t = kp_rotated + t | |
| # add expression deviation | |
| exp = exp.view(exp.shape[0], -1, 3) | |
| kp_transformed = kp_t + exp | |
| return {'value': kp_transformed} | |
| def make_animation(source_image, source_semantics, target_semantics, | |
| generator, kp_detector, mapping, | |
| yaw_c_seq=None, pitch_c_seq=None, roll_c_seq=None, | |
| use_exp=True): | |
| with torch.no_grad(): | |
| predictions = [] | |
| kp_canonical = kp_detector(source_image) | |
| he_source = mapping(source_semantics) | |
| kp_source = keypoint_transformation(kp_canonical, he_source) | |
| for frame_idx in tqdm(range(target_semantics.shape[1]), 'Face Renderer:'): | |
| target_semantics_frame = target_semantics[:, frame_idx] | |
| he_driving = mapping(target_semantics_frame) | |
| if not use_exp: | |
| he_driving['exp'] = he_driving['exp']*0 | |
| if yaw_c_seq is not None: | |
| he_driving['yaw_c'] = yaw_c_seq[:, frame_idx] | |
| if pitch_c_seq is not None: | |
| he_driving['pitch_c'] = pitch_c_seq[:, frame_idx] | |
| if roll_c_seq is not None: | |
| he_driving['roll_c'] = roll_c_seq[:, frame_idx] | |
| kp_driving = keypoint_transformation(kp_canonical, he_driving) | |
| #kp_norm = normalize_kp(kp_source=kp_source, kp_driving=kp_driving, | |
| #kp_driving_initial=kp_driving_initial) | |
| kp_norm = kp_driving | |
| out = generator(source_image, kp_source=kp_source, kp_driving=kp_norm) | |
| predictions.append(out['prediction']) | |
| predictions_ts = torch.stack(predictions, dim=1) | |
| return predictions_ts | |
| class AnimateModel(torch.nn.Module): | |
| """ | |
| Merge all generator related updates into single model for better multi-gpu usage | |
| """ | |
| def __init__(self, generator, kp_extractor, mapping): | |
| super(AnimateModel, self).__init__() | |
| self.kp_extractor = kp_extractor | |
| self.generator = generator | |
| self.mapping = mapping | |
| self.kp_extractor.eval() | |
| self.generator.eval() | |
| self.mapping.eval() | |
| def forward(self, x): | |
| source_image = x['source_image'] | |
| source_semantics = x['source_semantics'] | |
| target_semantics = x['target_semantics'] | |
| yaw_c_seq = x['yaw_c_seq'] | |
| pitch_c_seq = x['pitch_c_seq'] | |
| roll_c_seq = x['roll_c_seq'] | |
| predictions_video = make_animation(source_image, source_semantics, target_semantics, | |
| self.generator, self.kp_extractor, | |
| self.mapping, use_exp = True, | |
| yaw_c_seq=yaw_c_seq, pitch_c_seq=pitch_c_seq, roll_c_seq=roll_c_seq) | |
| return predictions_video |