add image_prompts

rudalle/__init__.py

@@ -4,7 +4,7 @@
 from .tokenizer import get_tokenizer
 from .realesrgan import get_realesrgan
 from .ruclip import get_ruclip
-from . import vae, dalle, tokenizer, realesrgan, pipelines, ruclip
+from . import vae, dalle, tokenizer, realesrgan, pipelines, ruclip, image_prompts
 
 
 __all__ = [
@@ -19,6 +19,7 @@
     'tokenizer',
     'realesrgan',
     'pipelines',
+    'image_prompts',
 ]
 
-__version__ = '0.0.1-rc1'
+__version__ = '0.0.1-rc2'

rudalle/image_prompts.py

@@ -0,0 +1,53 @@
+# -*- coding: utf-8 -*-
+import torch
+import numpy as np
+
+
+class ImagePrompts:
+
+    def __init__(self, pil_image, borders, vae, device='cpu', crop_first=False):
+        """
+        Args:
+            pil_image (PIL.Image): image in PIL format
+            borders (dict[str] | int): borders that we croped from pil_image
+                example: {'up': 4, 'right': 0, 'left': 0, 'down': 0} (1 int eq 8 pixels)
+            vae (VQGanGumbelVAE): VQGAN model for image encoding
+            device (str): cpu or cuda
+            crop_first (bool): if True, croped image before VQGAN encoding
+        """
+        self.device = device
+        img = self._preprocess_img(pil_image)
+        self.image_prompts_idx, self.image_prompts = self._get_image_prompts(img, borders, vae, crop_first)
+
+    def _preprocess_img(self, pil_img):
+        img = torch.tensor(np.array(pil_img.convert('RGB')).transpose(2, 0, 1)) / 255.
+        img = img.unsqueeze(0).to(self.device, dtype=torch.float32)
+        img = (2 * img) - 1
+        return img
+
+    @staticmethod
+    def _get_image_prompts(img, borders, vae, crop_first):
+        if crop_first:
+            assert borders['right'] + borders['left'] + borders['down'] == 0
+            up_border = borders['up'] * 8
+            _, _, [_, _, vqg_img] = vae.model.encode(img[:, :, :up_border, :])
+        else:
+            _, _, [_, _, vqg_img] = vae.model.encode(img)
+
+        bs, vqg_img_w, vqg_img_h = vqg_img.shape
+        mask = torch.zeros(vqg_img_w, vqg_img_h)
+        if borders['up'] != 0:
+            mask[:borders['up'], :] = 1.
+        if borders['down'] != 0:
+            mask[-borders['down']:, :] = 1.
+        if borders['right'] != 0:
+            mask[:, :borders['right']] = 1.
+        if borders['left'] != 0:
+            mask[:, -borders['left']:] = 1.
+        mask = mask.reshape(-1).bool()
+
+        image_prompts = vqg_img.reshape((bs, -1))
+        image_prompts_idx = np.arange(vqg_img_w * vqg_img_h)
+        image_prompts_idx = set(image_prompts_idx[mask])
+
+        return image_prompts_idx, image_prompts

rudalle/pipelines.py

@@ -10,8 +10,8 @@
 from . import utils
 
 
-def generate_images(text, tokenizer, dalle, vae, top_k, top_p, images_num, temperature=1.0, bs=8, seed=None,
-                    use_cache=True):
+def generate_images(text, tokenizer, dalle, vae, top_k, top_p, images_num, image_prompts=None, temperature=1.0, bs=8,
+                    seed=None, use_cache=True):
     # TODO docstring
     if seed is not None:
         utils.seed_everything(seed)
@@ -32,16 +32,26 @@ def generate_images(text, tokenizer, dalle, vae, top_k, top_p, images_num, tempe
             out = input_ids.unsqueeze(0).repeat(chunk_bs, 1).to(device)
             has_cache = False
             sample_scores = []
-            for _ in tqdm(range(out.shape[1], total_seq_length)):
-                logits, has_cache = dalle(out, attention_mask,
-                                          has_cache=has_cache, use_cache=use_cache, return_loss=False)
-                logits = logits[:, -1, vocab_size:]
-                logits /= temperature
-                filtered_logits = transformers.top_k_top_p_filtering(logits, top_k=top_k, top_p=top_p)
-                probs = torch.nn.functional.softmax(filtered_logits, dim=-1)
-                sample = torch.multinomial(probs, 1)
-                sample_scores.append(probs[torch.arange(probs.size(0)), sample.transpose(0, 1)])
-                out = torch.cat((out, sample), dim=-1)
+            if image_prompts is not None:
+                prompts_idx, prompts = image_prompts.image_prompts_idx, image_prompts.image_prompts
+                prompts = prompts.repeat(images_num, 1)
+                if use_cache:
+                    use_cache = False
+                    print('Warning: use_cache changed to False')
+            for idx in tqdm(range(out.shape[1], total_seq_length)):
+                idx -= text_seq_length
+                if image_prompts is not None and idx in prompts_idx:
+                    out = torch.cat((out, prompts[:, idx].unsqueeze(1)), dim=-1)
+                else:
+                    logits, has_cache = dalle(out, attention_mask,
+                                              has_cache=has_cache, use_cache=use_cache, return_loss=False)
+                    logits = logits[:, -1, vocab_size:]
+                    logits /= temperature
+                    filtered_logits = transformers.top_k_top_p_filtering(logits, top_k=top_k, top_p=top_p)
+                    probs = torch.nn.functional.softmax(filtered_logits, dim=-1)
+                    sample = torch.multinomial(probs, 1)
+                    sample_scores.append(probs[torch.arange(probs.size(0)), sample.transpose(0, 1)])
+                    out = torch.cat((out, sample), dim=-1)
             codebooks = out[:, -image_seq_length:]
             images = vae.decode(codebooks)
             pil_images += utils.torch_tensors_to_pil_list(images)

tests/test_image_prompts.py

@@ -0,0 +1,22 @@
+# -*- coding: utf-8 -*-
+import pytest
+
+from rudalle.image_prompts import ImagePrompts
+
+
+@pytest.mark.parametrize('borders, crop_first', [
+    ({'up': 4, 'right': 0, 'left': 0, 'down': 0}, False),
+    ({'up': 4, 'right': 0, 'left': 0, 'down': 0}, True),
+    ({'up': 4, 'right': 3, 'left': 3, 'down': 3}, False)
+])
+def test_image_prompts(sample_image, vae, borders, crop_first):
+    img = sample_image.copy()
+    img = img.resize((256, 256))
+    image_prompt = ImagePrompts(img, borders, vae, crop_first=crop_first)
+    if crop_first:
+        assert image_prompt.image_prompts.shape[1] == borders['up'] * 32
+        assert len(image_prompt.image_prompts_idx) == borders['up'] * 32
+    else:
+        assert image_prompt.image_prompts.shape[1] == 32 * 32
+        assert len(image_prompt.image_prompts_idx) == (borders['up'] + borders['down']) * 32 \
+            + (borders['left'] + borders['right']) * (32 - borders['up'] - borders['down'])