From 14beba63391e1ddc9a145bb638d9306086ad1a5c Mon Sep 17 00:00:00 2001
From: Volpeon <git@volpeon.ink>
Date: Fri, 7 Oct 2022 08:34:07 +0200
Subject: Training: Create multiple class images per training image

---
 data/csv.py | 54 ++++++++++++++++++++++++++++++++++++++++--------------
 1 file changed, 40 insertions(+), 14 deletions(-)

(limited to 'data')

diff --git a/data/csv.py b/data/csv.py
index abd329d..dcaf7d3 100644
--- a/data/csv.py
+++ b/data/csv.py
@@ -1,5 +1,3 @@
-import math
-import os
 import pandas as pd
 from pathlib import Path
 import pytorch_lightning as pl
@@ -16,6 +14,7 @@ class CSVDataModule(pl.LightningDataModule):
                  instance_identifier,
                  class_identifier=None,
                  class_subdir="db_cls",
+                 num_class_images=2,
                  size=512,
                  repeats=100,
                  interpolation="bicubic",
@@ -33,6 +32,7 @@ class CSVDataModule(pl.LightningDataModule):
         self.data_root = self.data_file.parent
         self.class_root = self.data_root.joinpath(class_subdir)
         self.class_root.mkdir(parents=True, exist_ok=True)
+        self.num_class_images = num_class_images
 
         self.tokenizer = tokenizer
         self.instance_identifier = instance_identifier
@@ -48,15 +48,37 @@ class CSVDataModule(pl.LightningDataModule):
 
     def prepare_data(self):
         metadata = pd.read_csv(self.data_file)
-        instance_image_paths = [self.data_root.joinpath(f) for f in metadata['image'].values]
-        class_image_paths = [self.class_root.joinpath(Path(f).name) for f in metadata['image'].values]
-        prompts = metadata['prompt'].values
-        nprompts = metadata['nprompt'].values if 'nprompt' in metadata else [""] * len(instance_image_paths)
-        skips = metadata['skip'].values if 'skip' in metadata else [""] * len(instance_image_paths)
-        self.data = [(i, c, p, n)
-                     for i, c, p, n, s
-                     in zip(instance_image_paths, class_image_paths, prompts, nprompts, skips)
-                     if s != "x"]
+        instance_image_paths = [
+            self.data_root.joinpath(f)
+            for f in metadata['image'].values
+            for i in range(self.num_class_images)
+        ]
+        class_image_paths = [
+            self.class_root.joinpath(f"{Path(f).stem}_{i}_{Path(f).suffix}")
+            for f in metadata['image'].values
+            for i in range(self.num_class_images)
+        ]
+        prompts = [
+            prompt
+            for prompt in metadata['prompt'].values
+            for i in range(self.num_class_images)
+        ]
+        nprompts = [
+            nprompt
+            for nprompt in metadata['nprompt'].values
+            for i in range(self.num_class_images)
+        ] if 'nprompt' in metadata else [""] * len(instance_image_paths)
+        skips = [
+            skip
+            for skip in metadata['skip'].values
+            for i in range(self.num_class_images)
+        ] if 'skip' in metadata else [""] * len(instance_image_paths)
+        self.data = [
+            (i, c, p, n)
+            for i, c, p, n, s
+            in zip(instance_image_paths, class_image_paths, prompts, nprompts, skips)
+            if s != "x"
+        ]
 
     def setup(self, stage=None):
         valid_set_size = int(len(self.data) * 0.2)
@@ -69,6 +91,7 @@ class CSVDataModule(pl.LightningDataModule):
 
         train_dataset = CSVDataset(self.data_train, self.tokenizer,
                                    instance_identifier=self.instance_identifier, class_identifier=self.class_identifier,
+                                   num_class_images=self.num_class_images,
                                    size=self.size, interpolation=self.interpolation,
                                    center_crop=self.center_crop, repeats=self.repeats)
         val_dataset = CSVDataset(self.data_val, self.tokenizer,
@@ -93,6 +116,7 @@ class CSVDataset(Dataset):
                  tokenizer,
                  instance_identifier,
                  class_identifier=None,
+                 num_class_images=2,
                  size=512,
                  repeats=1,
                  interpolation="bicubic",
@@ -103,6 +127,7 @@ class CSVDataset(Dataset):
         self.tokenizer = tokenizer
         self.instance_identifier = instance_identifier
         self.class_identifier = class_identifier
+        self.num_class_images = num_class_images
         self.cache = {}
 
         self.num_instance_images = len(self.data)
@@ -128,9 +153,10 @@ class CSVDataset(Dataset):
 
     def get_example(self, i):
         instance_image_path, class_image_path, prompt, nprompt = self.data[i % self.num_instance_images]
+        cache_key = f"{instance_image_path}_{class_image_path}"
 
-        if instance_image_path in self.cache:
-            return self.cache[instance_image_path]
+        if cache_key in self.cache:
+            return self.cache[cache_key]
 
         example = {}
 
@@ -149,7 +175,7 @@ class CSVDataset(Dataset):
             max_length=self.tokenizer.model_max_length,
         ).input_ids
 
-        if self.class_identifier is not None:
+        if self.num_class_images != 0:
             class_image = Image.open(class_image_path)
             if not class_image.mode == "RGB":
                 class_image = class_image.convert("RGB")
-- 
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