3 files changed, 284 insertions, 0 deletions

diff --git a/training/modules/dreambooth.py b/training/modules/dreambooth.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/training/modules/dreambooth.py
diff --git a/training/modules/lora.py b/training/modules/lora.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/training/modules/lora.py
diff --git a/training/modules/ti.py b/training/modules/ti.py
new file mode 100644
index 0000000..2db6f88
--- /dev/null
+++ b/training/modules/ti.py
@@ -0,0 +1,284 @@
+from typing import Literal
+from functools import partial
+from contextlib import contextmanager, nullcontext
+
+import torch
+
+from slugify import slugify
+
+from accelerate import Accelerator
+from transformers import CLIPTextModel
+from diffusers import AutoencoderKL, UNet2DConditionModel
+
+from pipelines.stable_diffusion.vlpn_stable_diffusion import VlpnStableDiffusion
+from models.clip.tokenizer import MultiCLIPTokenizer
+
+from training.common import TrainingSetup, get_scheduler, train_loop, loss_step
+from training.util import EMAModel, CheckpointerBase
+
+
+class Checkpointer(CheckpointerBase):
+    def __init__(
+        self,
+        accelerator: Accelerator,
+        vae: AutoencoderKL,
+        unet: UNet2DConditionModel,
+        tokenizer: MultiCLIPTokenizer,
+        text_encoder: CLIPTextModel,
+        ema_embeddings: EMAModel,
+        weight_dtype: torch.dtype,
+        scheduler,
+        placeholder_token,
+        placeholder_token_ids,
+        *args,
+        **kwargs
+    ):
+        super().__init__(*args, **kwargs)
+
+        self.weight_dtype = weight_dtype
+        self.accelerator = accelerator
+        self.vae = vae
+        self.unet = unet
+        self.tokenizer = tokenizer
+        self.text_encoder = text_encoder
+        self.ema_embeddings = ema_embeddings
+        self.scheduler = scheduler
+        self.placeholder_token = placeholder_token
+        self.placeholder_token_ids = placeholder_token_ids
+
+    @torch.no_grad()
+    def checkpoint(self, step, postfix):
+        print("Saving checkpoint for step %d..." % step)
+
+        checkpoints_path = self.output_dir.joinpath("checkpoints")
+        checkpoints_path.mkdir(parents=True, exist_ok=True)
+
+        text_encoder = self.accelerator.unwrap_model(self.text_encoder)
+
+        ema_context = nullcontext()
+        if self.ema_embeddings is not None:
+            ema_context = self.ema_embeddings.apply_temporary(
+                text_encoder.text_model.embeddings.temp_token_embedding.parameters())
+
+        with ema_context:
+            for (token, ids) in zip(self.placeholder_token, self.placeholder_token_ids):
+                text_encoder.text_model.embeddings.save_embed(
+                    ids,
+                    checkpoints_path.joinpath(f"{slugify(token)}_{step}_{postfix}.bin")
+                )
+
+        del text_encoder
+
+    @torch.no_grad()
+    def save_samples(self, step, num_inference_steps, guidance_scale=7.5, eta=0.0):
+        text_encoder = self.accelerator.unwrap_model(self.text_encoder)
+
+        ema_context = nullcontext()
+        if self.ema_embeddings is not None:
+            ema_context = self.ema_embeddings.apply_temporary(
+                text_encoder.text_model.embeddings.temp_token_embedding.parameters())
+
+        with ema_context:
+            orig_dtype = text_encoder.dtype
+            text_encoder.to(dtype=self.weight_dtype)
+
+            pipeline = VlpnStableDiffusion(
+                text_encoder=text_encoder,
+                vae=self.vae,
+                unet=self.unet,
+                tokenizer=self.tokenizer,
+                scheduler=self.scheduler,
+            ).to(self.accelerator.device)
+            pipeline.set_progress_bar_config(dynamic_ncols=True)
+
+            super().save_samples(pipeline, step, num_inference_steps, guidance_scale, eta)
+
+            text_encoder.to(dtype=orig_dtype)
+
+        del text_encoder
+        del pipeline
+
+        if torch.cuda.is_available():
+            torch.cuda.empty_cache()
+
+
+def train_ti(
+    setup: TrainingSetup,
+    num_train_epochs: int = 100,
+    num_class_images: int = 0,
+    prior_loss_weight: float = 1.0,
+    use_ema: bool = False,
+    ema_inv_gamma: float = 1.0,
+    ema_power: float = 4/5,
+    ema_max_decay: float = .9999,
+    adam_beta1: float = 0.9,
+    adam_beta2: float = 0.999,
+    adam_weight_decay: float = 0,
+    adam_epsilon: float = 1e-08,
+    adam_amsgrad: bool = False,
+    lr_scheduler: Literal[
+        "linear", "cosine", "cosine_with_restarts", "polynomial", "constant", "constant_with_warmup", "one_cycle"
+    ] = "one_cycle",
+    lr_min_lr: float = 0.04,
+    lr_warmup_func: Literal["linear", "cos"] = "cos",
+    lr_annealing_func: Literal["linear", "half_cos", "cos"] = "cos",
+    lr_warmup_exp: int = 1,
+    lr_annealing_exp: int = 1,
+    lr_cycles: int = 1,
+    lr_warmup_epochs: int = 10,
+    emb_decay_target: float = 0.4,
+    emb_decay_factor: float = 1,
+    emb_decay_start: float = 1e-4,
+    sample_image_size: int = 768,
+    sample_batch_size: int = 1,
+    sample_batches: int = 1,
+    sample_frequency: int = 10,
+    sample_steps: int = 20,
+    checkpoint_frequency: int = 50,
+    global_step_offset: int = 0,
+):
+    if use_ema:
+        ema_embeddings = EMAModel(
+            setup.text_encoder.text_model.embeddings.temp_token_embedding.parameters(),
+            inv_gamma=ema_inv_gamma,
+            power=ema_power,
+            max_value=ema_max_decay,
+        )
+    else:
+        ema_embeddings = None
+
+    setup.text_encoder.requires_grad_(True)
+    setup.text_encoder.text_model.encoder.requires_grad_(False)
+    setup.text_encoder.text_model.final_layer_norm.requires_grad_(False)
+    setup.text_encoder.text_model.embeddings.position_embedding.requires_grad_(False)
+    setup.text_encoder.text_model.embeddings.token_embedding.requires_grad_(False)
+
+    # Initialize the optimizer
+    optimizer = setup.optimizer_class(
+        setup.text_encoder.text_model.embeddings.temp_token_embedding.parameters(),
+        lr=setup.learning_rate,
+        betas=(adam_beta1, adam_beta2),
+        weight_decay=adam_weight_decay,
+        eps=adam_epsilon,
+        amsgrad=adam_amsgrad,
+    )
+
+    lr_scheduler = get_scheduler(
+        lr_scheduler,
+        optimizer=optimizer,
+        min_lr=lr_min_lr,
+        warmup_func=lr_warmup_func,
+        annealing_func=lr_annealing_func,
+        warmup_exp=lr_warmup_exp,
+        annealing_exp=lr_annealing_exp,
+        cycles=lr_cycles,
+        train_epochs=num_train_epochs,
+        warmup_epochs=lr_warmup_epochs,
+        num_training_steps_per_epoch=len(setup.train_dataloader),
+        gradient_accumulation_steps=setup.accelerator.gradient_accumulation_steps
+    )
+
+    text_encoder, optimizer, lr_scheduler = setup.accelerator.prepare(
+        setup.text_encoder, optimizer, lr_scheduler
+    )
+
+    # Move vae and unet to device
+    setup.vae.to(setup.accelerator.device, dtype=setup.weight_dtype)
+    setup.unet.to(setup.accelerator.device, dtype=setup.weight_dtype)
+
+    if use_ema:
+        ema_embeddings.to(setup.accelerator.device)
+
+    setup.unet.train()
+
+    @contextmanager
+    def on_train(epoch: int):
+        try:
+            setup.tokenizer.train()
+            yield
+        finally:
+            pass
+
+    @contextmanager
+    def on_eval():
+        try:
+            setup.tokenizer.eval()
+
+            ema_context = nullcontext()
+            if use_ema:
+                ema_context = ema_embeddings.apply_temporary(
+                    text_encoder.text_model.embeddings.temp_token_embedding.parameters())
+
+            with ema_context:
+                yield
+        finally:
+            pass
+
+    @torch.no_grad()
+    def on_after_optimize(lr: float):
+        text_encoder.text_model.embeddings.normalize(
+            emb_decay_target,
+            min(1.0, max(0.0, emb_decay_factor * ((lr - emb_decay_start) / (setup.learning_rate - emb_decay_start))))
+        )
+
+        if use_ema:
+            ema_embeddings.step(text_encoder.text_model.embeddings.temp_token_embedding.parameters())
+
+    def on_log():
+        if use_ema:
+            return {"ema_decay": ema_embeddings.decay}
+        return {}
+
+    loss_step_ = partial(
+        loss_step,
+        setup.vae,
+        setup.noise_scheduler,
+        setup.unet,
+        text_encoder,
+        num_class_images != 0,
+        prior_loss_weight,
+        setup.seed,
+    )
+
+    checkpointer = Checkpointer(
+        accelerator=setup.accelerator,
+        vae=setup.vae,
+        unet=setup.unet,
+        tokenizer=setup.tokenizer,
+        text_encoder=text_encoder,
+        ema_embeddings=ema_embeddings,
+        weight_dtype=setup.weight_dtype,
+        scheduler=setup.checkpoint_scheduler,
+        placeholder_token=setup.placeholder_token,
+        placeholder_token_ids=setup.placeholder_token_ids,
+        train_dataloader=setup.train_dataloader,
+        val_dataloader=setup.val_dataloader,
+        output_dir=setup.output_dir,
+        seed=setup.seed,
+        sample_image_size=sample_image_size,
+        sample_batch_size=sample_batch_size,
+        sample_batches=sample_batches
+    )
+
+    if setup.accelerator.is_main_process:
+        setup.accelerator.init_trackers("textual_inversion")
+
+    train_loop(
+        accelerator=setup.accelerator,
+        optimizer=optimizer,
+        lr_scheduler=lr_scheduler,
+        model=text_encoder,
+        checkpointer=checkpointer,
+        train_dataloader=setup.train_dataloader,
+        val_dataloader=setup.val_dataloader,
+        loss_step=loss_step_,
+        sample_frequency=sample_frequency,
+        sample_steps=sample_steps,
+        checkpoint_frequency=checkpoint_frequency,
+        global_step_offset=global_step_offset,
+        num_epochs=num_train_epochs,
+        on_log=on_log,
+        on_train=on_train,
+        on_after_optimize=on_after_optimize,
+        on_eval=on_eval
+    )