From 5ef5ff5aece1a29995f11943c3ca1d6fe2fabbfa Mon Sep 17 00:00:00 2001
From: Volpeon <git@volpeon.ink>
Date: Wed, 19 Oct 2022 17:45:56 +0200
Subject: Dreambooth: Added option to insert a new input token; removed
 Dreambooth Plus

---
 dreambooth.py | 48 ++++++++++++++++++++++++++++++++++++++++++------
 1 file changed, 42 insertions(+), 6 deletions(-)

(limited to 'dreambooth.py')

diff --git a/dreambooth.py b/dreambooth.py
index d1cf535..da8399f 100644
--- a/dreambooth.py
+++ b/dreambooth.py
@@ -68,6 +68,18 @@ def parse_args():
         default=None,
         help="A token to use as a placeholder for the concept.",
     )
+    parser.add_argument(
+        "--placeholder_token",
+        type=str,
+        default="<*>",
+        help="A token to use as a placeholder for the concept.",
+    )
+    parser.add_argument(
+        "--initializer_token",
+        type=str,
+        default=None,
+        help="A token to use as initializer word."
+    )
     parser.add_argument(
         "--num_class_images",
         type=int,
@@ -114,7 +126,7 @@ def parse_args():
     parser.add_argument(
         "--max_train_steps",
         type=int,
-        default=3600,
+        default=6000,
         help="Total number of training steps to perform.  If provided, overrides num_train_epochs.",
     )
     parser.add_argument(
@@ -131,13 +143,13 @@ def parse_args():
     parser.add_argument(
         "--learning_rate_unet",
         type=float,
-        default=3e-6,
+        default=2e-6,
         help="Initial learning rate (after the potential warmup period) to use.",
     )
     parser.add_argument(
         "--learning_rate_text",
         type=float,
-        default=3e-6,
+        default=2e-6,
         help="Initial learning rate (after the potential warmup period) to use.",
     )
     parser.add_argument(
@@ -476,8 +488,13 @@ class Checkpointer:
 def main():
     args = parse_args()
 
+    instance_identifier = args.instance_identifier
+
+    if args.placeholder_token is not None:
+        instance_identifier = instance_identifier.format(args.placeholder_token)
+
     now = datetime.datetime.now().strftime("%Y-%m-%dT%H-%M-%S")
-    basepath = Path(args.output_dir).joinpath(slugify(args.instance_identifier), now)
+    basepath = Path(args.output_dir).joinpath(slugify(instance_identifier), now)
     basepath.mkdir(parents=True, exist_ok=True)
 
     accelerator = Accelerator(
@@ -514,6 +531,25 @@ def main():
         device=accelerator.device
     ) if args.use_ema else None
 
+    if args.initializer_token is not None:
+        # Convert the initializer_token, placeholder_token to ids
+        initializer_token_ids = tokenizer.encode(args.initializer_token, add_special_tokens=False)
+        print(f"Initializer token {args.initializer_token} maps to {len(initializer_token_ids)} embeddings.")
+        initializer_token_ids = torch.tensor(initializer_token_ids[:1])
+
+        # Add the placeholder token in tokenizer
+        num_added_tokens = tokenizer.add_tokens(args.placeholder_token)
+        if num_added_tokens == 0:
+            print(f"Re-using existing token {args.placeholder_token}.")
+        else:
+            print(f"Training new token {args.placeholder_token}.")
+        placeholder_token_id = tokenizer.convert_tokens_to_ids(args.placeholder_token)
+
+        text_encoder.resize_token_embeddings(len(tokenizer))
+        token_embeds = text_encoder.get_input_embeddings()
+        initializer_token_embeddings = token_embeds(initializer_token_ids)
+        token_embeds.weight.data[placeholder_token_id] = initializer_token_embeddings
+
     prompt_processor = PromptProcessor(tokenizer, text_encoder)
 
     if args.gradient_checkpointing:
@@ -605,7 +641,7 @@ def main():
         data_file=args.train_data_file,
         batch_size=args.train_batch_size,
         prompt_processor=prompt_processor,
-        instance_identifier=args.instance_identifier,
+        instance_identifier=instance_identifier,
         class_identifier=args.class_identifier,
         class_subdir="cls",
         num_class_images=args.num_class_images,
@@ -735,7 +771,7 @@ def main():
         tokenizer=tokenizer,
         text_encoder=text_encoder,
         output_dir=basepath,
-        instance_identifier=args.instance_identifier,
+        instance_identifier=instance_identifier,
         sample_image_size=args.sample_image_size,
         sample_batch_size=args.sample_batch_size,
         sample_batches=args.sample_batches,
-- 
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