From d9bb4a0d43276c8e120866af044fcf3566930859 Mon Sep 17 00:00:00 2001
From: Volpeon <git@volpeon.ink>
Date: Thu, 23 Mar 2023 22:15:17 +0100
Subject: Bring back Perlin offset noise

---
 train_ti.py            |  7 +++++++
 training/functional.py | 15 ++++++++++++++-
 2 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/train_ti.py b/train_ti.py
index 9bc74c1..ef71f6f 100644
--- a/train_ti.py
+++ b/train_ti.py
@@ -187,6 +187,12 @@ def parse_args():
         default="auto",
         help='Vector shuffling algorithm. Choose between ["all", "trailing", "leading", "between", "auto", "off"]',
     )
+    parser.add_argument(
+        "--perlin_strength",
+        type=float,
+        default=0.1,
+        help="Perlin offset noise strength.",
+    )
     parser.add_argument(
         "--num_train_epochs",
         type=int,
@@ -655,6 +661,7 @@ def main():
         checkpoint_frequency=args.checkpoint_frequency,
         milestone_checkpoints=not args.no_milestone_checkpoints,
         global_step_offset=global_step_offset,
+        perlin_strength=args.perlin_strength,
         # --
         tokenizer=tokenizer,
         sample_scheduler=sample_scheduler,
diff --git a/training/functional.py b/training/functional.py
index 015fe5e..a5b339d 100644
--- a/training/functional.py
+++ b/training/functional.py
@@ -278,10 +278,11 @@ def loss_step(
     with_prior_preservation: bool,
     prior_loss_weight: float,
     seed: int,
+    perlin_strength: float,
     step: int,
     batch: dict[str, Any],
     eval: bool = False,
-    min_snr_gamma: int = 5
+    min_snr_gamma: int = 5,
 ):
     # Convert images to latent space
     latents = vae.encode(batch["pixel_values"]).latent_dist.sample()
@@ -300,6 +301,16 @@ def loss_step(
         generator=generator
     )
 
+    if perlin_strength != 0:
+        noise += perlin_strength * perlin_noise(
+            latents.shape,
+            res=1,
+            octaves=4,
+            dtype=latents.dtype,
+            device=latents.device,
+            generator=generator
+        )
+
     # Sample a random timestep for each image
     timesteps = torch.randint(
         0,
@@ -600,6 +611,7 @@ def train(
     global_step_offset: int = 0,
     with_prior_preservation: bool = False,
     prior_loss_weight: float = 1.0,
+    perlin_strength: float = 0.1,
     **kwargs,
 ):
     text_encoder, unet, optimizer, train_dataloader, val_dataloader, lr_scheduler, extra = strategy.prepare(
@@ -635,6 +647,7 @@ def train(
         with_prior_preservation,
         prior_loss_weight,
         seed,
+        perlin_strength,
     )
 
     if accelerator.is_main_process:
-- 
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