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| import numpy as np | |
| import torch | |
| import torch.nn as nn | |
| from transformers import CLIPConfig, CLIPVisionModel, PreTrainedModel | |
| from ...utils import logging | |
| logger = logging.get_logger(__name__) | |
| def cosine_distance(image_embeds, text_embeds): | |
| normalized_image_embeds = nn.functional.normalize(image_embeds) | |
| normalized_text_embeds = nn.functional.normalize(text_embeds) | |
| return torch.mm(normalized_image_embeds, normalized_text_embeds.t()) | |
| class StableDiffusionSafetyChecker(PreTrainedModel): | |
| config_class = CLIPConfig | |
| def __init__(self, config: CLIPConfig): | |
| super().__init__(config) | |
| self.vision_model = CLIPVisionModel(config.vision_config) | |
| self.visual_projection = nn.Linear(config.vision_config.hidden_size, config.projection_dim, bias=False) | |
| self.concept_embeds = nn.Parameter(torch.ones(17, config.projection_dim), requires_grad=False) | |
| self.special_care_embeds = nn.Parameter(torch.ones(3, config.projection_dim), requires_grad=False) | |
| self.register_buffer("concept_embeds_weights", torch.ones(17)) | |
| self.register_buffer("special_care_embeds_weights", torch.ones(3)) | |
| def forward(self, clip_input, images): | |
| pooled_output = self.vision_model(clip_input)[1] # pooled_output | |
| image_embeds = self.visual_projection(pooled_output) | |
| special_cos_dist = cosine_distance(image_embeds, self.special_care_embeds).cpu().numpy() | |
| cos_dist = cosine_distance(image_embeds, self.concept_embeds).cpu().numpy() | |
| result = [] | |
| batch_size = image_embeds.shape[0] | |
| for i in range(batch_size): | |
| result_img = {"special_scores": {}, "special_care": [], "concept_scores": {}, "bad_concepts": []} | |
| # increase this value to create a stronger `nfsw` filter | |
| # at the cost of increasing the possibility of filtering benign images | |
| adjustment = 0.0 | |
| for concet_idx in range(len(special_cos_dist[0])): | |
| concept_cos = special_cos_dist[i][concet_idx] | |
| concept_threshold = self.special_care_embeds_weights[concet_idx].item() | |
| result_img["special_scores"][concet_idx] = round(concept_cos - concept_threshold + adjustment, 3) | |
| if result_img["special_scores"][concet_idx] > 0: | |
| result_img["special_care"].append({concet_idx, result_img["special_scores"][concet_idx]}) | |
| adjustment = 0.01 | |
| for concet_idx in range(len(cos_dist[0])): | |
| concept_cos = cos_dist[i][concet_idx] | |
| concept_threshold = self.concept_embeds_weights[concet_idx].item() | |
| result_img["concept_scores"][concet_idx] = round(concept_cos - concept_threshold + adjustment, 3) | |
| if result_img["concept_scores"][concet_idx] > 0: | |
| result_img["bad_concepts"].append(concet_idx) | |
| result.append(result_img) | |
| has_nsfw_concepts = [len(res["bad_concepts"]) > 0 for res in result] | |
| for idx, has_nsfw_concept in enumerate(has_nsfw_concepts): | |
| if has_nsfw_concept: | |
| images[idx] = np.zeros(images[idx].shape) # black image | |
| if any(has_nsfw_concepts): | |
| logger.warning( | |
| "Potential NSFW content was detected in one or more images. A black image will be returned instead." | |
| " Try again with a different prompt and/or seed." | |
| ) | |
| return images, has_nsfw_concepts | |
| def forward_onnx(self, clip_input: torch.FloatTensor, images: torch.FloatTensor): | |
| pooled_output = self.vision_model(clip_input)[1] # pooled_output | |
| image_embeds = self.visual_projection(pooled_output) | |
| special_cos_dist = cosine_distance(image_embeds, self.special_care_embeds) | |
| cos_dist = cosine_distance(image_embeds, self.concept_embeds) | |
| # increase this value to create a stronger `nsfw` filter | |
| # at the cost of increasing the possibility of filtering benign images | |
| adjustment = 0.0 | |
| special_scores = special_cos_dist - self.special_care_embeds_weights + adjustment | |
| # special_scores = special_scores.round(decimals=3) | |
| special_care = torch.any(special_scores > 0, dim=1) | |
| special_adjustment = special_care * 0.01 | |
| special_adjustment = special_adjustment.unsqueeze(1).expand(-1, cos_dist.shape[1]) | |
| concept_scores = (cos_dist - self.concept_embeds_weights) + special_adjustment | |
| # concept_scores = concept_scores.round(decimals=3) | |
| has_nsfw_concepts = torch.any(concept_scores > 0, dim=1) | |
| images[has_nsfw_concepts] = 0.0 # black image | |
| return images, has_nsfw_concepts | |