| import json | |
| import torch | |
| import numpy as np | |
| from sklearn.preprocessing import minmax_scale, StandardScaler | |
| from anonymization import DemoPoolAnonymizer, DemoRandomAnonymizer, DemoGANAnonymizer | |
| TAGS_TO_MODELS = { | |
| 'pool': 'pool_minmax_ecapa+xvector', | |
| 'random': 'random_in-scale_ecapa+xvector', | |
| 'gan': 'gan' | |
| } | |
| ANON_MODELS = { | |
| 'pool': DemoPoolAnonymizer, | |
| 'random': DemoRandomAnonymizer, | |
| 'gan': DemoGANAnonymizer | |
| } | |
| class DemoAnonymizer: | |
| def __init__(self, model_path, model_tag, device): | |
| self.device = device | |
| self.scaling = None | |
| self.std_scaler = None | |
| self.model_tag = model_tag | |
| self.dim_ranges = self._load_dim_ranges(model_path / TAGS_TO_MODELS[model_tag]) | |
| self.anonymizer = self._load_anonymizer(model_path / TAGS_TO_MODELS[model_tag]) | |
| def anonymize_embedding(self, audio, sr): | |
| anon_embedding = self.anonymizer.anonymize_embedding(audio, sr) | |
| if self.dim_ranges: | |
| anon_embedding = self._scale_embedding(anon_embedding) | |
| return anon_embedding | |
| def _load_dim_ranges(self, model_dir): | |
| if (model_dir / 'stats_per_dim.json').exists(): | |
| with open(model_dir / 'stats_per_dim.json') as f: | |
| dim_ranges = json.load(f) | |
| return [(v['min'], v['max']) for k, v in sorted(dim_ranges.items(), key=lambda x: int(x[0]))] | |
| def _load_anonymizer(self, model_dir): | |
| model_name = model_dir.name.lower() | |
| if 'pool' in model_name: | |
| model_type = 'pool' | |
| elif 'gan' in model_name: | |
| model_type = 'gan' | |
| else: | |
| model_type = 'random' | |
| print(f'Model type of anonymizer: {model_type}') | |
| model = ANON_MODELS[model_type](device=self.device, vec_type='ecapa+xvector') | |
| model.load_parameters(model_dir) | |
| if 'minmax' in model_name: | |
| self.scaling = 'std' | |
| self.std_scaler = StandardScaler() | |
| self.std_scaler.fit(model.pool_embeddings.cpu().numpy()) | |
| return model | |
| def _scale_embedding(self, vector): | |
| if self.scaling == 'minmax': | |
| vector = vector.cpu().numpy() | |
| scaled_dims = [] | |
| for i in range(len(self.dim_ranges)): | |
| scaled_dims.append(minmax_scale(np.array([vector[i]]), self.dim_ranges[i])[0]) | |
| vector = torch.tensor(scaled_dims).to(self.device) | |
| elif self.scaling == 'std': | |
| vector = vector.unsqueeze(0).cpu().numpy() | |
| vector = torch.tensor(self.std_scaler.transform(vector)[0]) | |
| return vector | |