From 89d471652644f449966a0cd944041c98dab7f66c Mon Sep 17 00:00:00 2001
From: Volpeon <git@volpeon.ink>
Date: Fri, 13 Jan 2023 07:25:24 +0100
Subject: Code deduplication

---
 training/common.py | 55 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)

(limited to 'training')

diff --git a/training/common.py b/training/common.py
index 0b2ae44..90cf910 100644
--- a/training/common.py
+++ b/training/common.py
@@ -1,10 +1,65 @@
+import math
+
 import torch
 import torch.nn.functional as F
 
 from diffusers import AutoencoderKL, DDPMScheduler, UNet2DConditionModel
+from diffusers.optimization import get_scheduler as get_scheduler_, get_cosine_with_hard_restarts_schedule_with_warmup
 
 from pipelines.stable_diffusion.vlpn_stable_diffusion import VlpnStableDiffusion
 
+from training.optimization import get_one_cycle_schedule
+
+
+def get_scheduler(
+    id: str,
+    min_lr: float,
+    lr: float,
+    warmup_func: str,
+    annealing_func: str,
+    warmup_exp: int,
+    annealing_exp: int,
+    cycles: int,
+    warmup_epochs: int,
+    optimizer: torch.optim.Optimizer,
+    max_train_steps: int,
+    num_update_steps_per_epoch: int,
+    gradient_accumulation_steps: int,
+):
+    warmup_steps = warmup_epochs * num_update_steps_per_epoch * gradient_accumulation_steps
+
+    if id == "one_cycle":
+        min_lr = 0.04 if min_lr is None else min_lr / lr
+
+        lr_scheduler = get_one_cycle_schedule(
+            optimizer=optimizer,
+            num_training_steps=max_train_steps * gradient_accumulation_steps,
+            warmup=warmup_func,
+            annealing=annealing_func,
+            warmup_exp=warmup_exp,
+            annealing_exp=annealing_exp,
+            min_lr=min_lr,
+        )
+    elif id == "cosine_with_restarts":
+        cycles = cycles if cycles is not None else math.ceil(
+            math.sqrt(((max_train_steps - warmup_steps) / num_update_steps_per_epoch)))
+
+        lr_scheduler = get_cosine_with_hard_restarts_schedule_with_warmup(
+            optimizer=optimizer,
+            num_warmup_steps=warmup_steps,
+            num_training_steps=max_train_steps * gradient_accumulation_steps,
+            num_cycles=cycles,
+        )
+    else:
+        lr_scheduler = get_scheduler_(
+            id,
+            optimizer=optimizer,
+            num_warmup_steps=warmup_steps,
+            num_training_steps=max_train_steps * gradient_accumulation_steps,
+        )
+
+    return lr_scheduler
+
 
 def generate_class_images(
     accelerator,
-- 
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