2 files changed, 193 insertions, 0 deletions

diff --git a/data/dreambooth/csv.py b/data/dreambooth/csv.py
new file mode 100644
index 0000000..04df4c6
--- /dev/null
+++ b/data/dreambooth/csv.py
@@ -0,0 +1,177 @@
+import os
+import pandas as pd
+from pathlib import Path
+import PIL
+import pytorch_lightning as pl
+from PIL import Image
+from torch.utils.data import Dataset, DataLoader, random_split
+from torchvision import transforms
+
+
+class CSVDataModule(pl.LightningDataModule):
+    def __init__(self,
+                 batch_size,
+                 data_root,
+                 tokenizer,
+                 instance_prompt,
+                 class_data_root=None,
+                 class_prompt=None,
+                 size=512,
+                 repeats=100,
+                 interpolation="bicubic",
+                 identifier="*",
+                 center_crop=False,
+                 collate_fn=None):
+        super().__init__()
+
+        self.data_root = data_root
+        self.tokenizer = tokenizer
+        self.instance_prompt = instance_prompt
+        self.class_data_root = class_data_root
+        self.class_prompt = class_prompt
+        self.size = size
+        self.repeats = repeats
+        self.identifier = identifier
+        self.center_crop = center_crop
+        self.interpolation = interpolation
+        self.collate_fn = collate_fn
+        self.batch_size = batch_size
+
+    def prepare_data(self):
+        metadata = pd.read_csv(f'{self.data_root}/list.csv')
+        image_paths = [os.path.join(self.data_root, f_path) for f_path in metadata['image'].values]
+        captions = [caption for caption in metadata['caption'].values]
+        skips = [skip for skip in metadata['skip'].values]
+        self.data_full = [(img, cap) for img, cap, skip in zip(image_paths, captions, skips) if skip != "x"]
+
+    def setup(self, stage=None):
+        train_set_size = int(len(self.data_full) * 0.8)
+        valid_set_size = len(self.data_full) - train_set_size
+        self.data_train, self.data_val = random_split(self.data_full, [train_set_size, valid_set_size])
+
+        train_dataset = CSVDataset(self.data_train, self.tokenizer, instance_prompt=self.instance_prompt,
+                                   class_data_root=self.class_data_root,
+                                   class_prompt=self.class_prompt, size=self.size, repeats=self.repeats,
+                                   interpolation=self.interpolation, identifier=self.identifier,
+                                   center_crop=self.center_crop)
+        val_dataset = CSVDataset(self.data_val, self.tokenizer, instance_prompt=self.instance_prompt,
+                                 class_data_root=self.class_data_root,
+                                 class_prompt=self.class_prompt, size=self.size, interpolation=self.interpolation,
+                                 identifier=self.identifier, center_crop=self.center_crop)
+        self.train_dataloader_ = DataLoader(train_dataset, batch_size=self.batch_size,
+                                            shuffle=True, collate_fn=self.collate_fn)
+        self.val_dataloader_ = DataLoader(val_dataset, batch_size=self.batch_size, collate_fn=self.collate_fn)
+
+    def train_dataloader(self):
+        return self.train_dataloader_
+
+    def val_dataloader(self):
+        return self.val_dataloader_
+
+
+class CSVDataset(Dataset):
+    def __init__(self,
+                 data,
+                 tokenizer,
+                 instance_prompt,
+                 class_data_root=None,
+                 class_prompt=None,
+                 size=512,
+                 repeats=1,
+                 interpolation="bicubic",
+                 identifier="*",
+                 center_crop=False,
+                 ):
+
+        self.data = data
+        self.tokenizer = tokenizer
+        self.instance_prompt = instance_prompt
+
+        self.num_instance_images = len(self.data)
+        self._length = self.num_instance_images * repeats
+
+        self.identifier = identifier
+
+        if class_data_root is not None:
+            self.class_data_root = Path(class_data_root)
+            self.class_data_root.mkdir(parents=True, exist_ok=True)
+
+            self.class_images = list(Path(class_data_root).iterdir())
+            self.num_class_images = len(self.class_images)
+            self._length = max(self.num_class_images, self.num_instance_images)
+
+            self.class_prompt = class_prompt
+        else:
+            self.class_data_root = None
+
+        self.interpolation = {"linear": PIL.Image.LINEAR,
+                              "bilinear": PIL.Image.BILINEAR,
+                              "bicubic": PIL.Image.BICUBIC,
+                              "lanczos": PIL.Image.LANCZOS,
+                              }[interpolation]
+        self.image_transforms = transforms.Compose(
+            [
+                transforms.Resize(size, interpolation=transforms.InterpolationMode.BILINEAR),
+                transforms.CenterCrop(size) if center_crop else transforms.RandomCrop(size),
+                transforms.ToTensor(),
+                transforms.Normalize([0.5], [0.5]),
+            ]
+        )
+
+        self.cache = {}
+
+    def __len__(self):
+        return self._length
+
+    def get_example(self, i):
+        image_path, text = self.data[i % self.num_instance_images]
+
+        if image_path in self.cache:
+            return self.cache[image_path]
+
+        example = {}
+
+        instance_image = Image.open(image_path)
+        if not instance_image.mode == "RGB":
+            instance_image = instance_image.convert("RGB")
+
+        text = text.format(self.identifier)
+
+        example["prompts"] = text
+        example["instance_images"] = instance_image
+        example["instance_prompt_ids"] = self.tokenizer(
+            self.instance_prompt,
+            padding="do_not_pad",
+            truncation=True,
+            max_length=self.tokenizer.model_max_length,
+        ).input_ids
+
+        if self.class_data_root:
+            class_image = Image.open(self.class_images[i % self.num_class_images])
+            if not class_image.mode == "RGB":
+                class_image = class_image.convert("RGB")
+
+            example["class_images"] = class_image
+            example["class_prompt_ids"] = self.tokenizer(
+                self.class_prompt,
+                padding="do_not_pad",
+                truncation=True,
+                max_length=self.tokenizer.model_max_length,
+            ).input_ids
+
+        self.cache[image_path] = example
+        return example
+
+    def __getitem__(self, i):
+        example = {}
+        unprocessed_example = self.get_example(i)
+
+        example["prompts"] = unprocessed_example["prompts"]
+        example["instance_images"] = self.image_transforms(unprocessed_example["instance_images"])
+        example["instance_prompt_ids"] = unprocessed_example["instance_prompt_ids"]
+
+        if self.class_data_root:
+            example["class_images"] = self.image_transforms(unprocessed_example["class_images"])
+            example["class_prompt_ids"] = unprocessed_example["class_prompt_ids"]
+
+        return example
diff --git a/data/dreambooth/prompt.py b/data/dreambooth/prompt.py
new file mode 100644
index 0000000..34f510d
--- /dev/null
+++ b/data/dreambooth/prompt.py
@@ -0,0 +1,16 @@
+from torch.utils.data import Dataset
+
+
+class PromptDataset(Dataset):
+    def __init__(self, prompt, num_samples):
+        self.prompt = prompt
+        self.num_samples = num_samples
+
+    def __len__(self):
+        return self.num_samples
+
+    def __getitem__(self, index):
+        example = {}
+        example["prompt"] = self.prompt
+        example["index"] = index
+        return example