From ac0ecf3b4b9d147743c04f0ff4ddc4cf4595e11d Mon Sep 17 00:00:00 2001
From: AUTOMATIC1111 <16777216c@gmail.com>
Date: Mon, 1 Jan 2024 16:28:58 +0300
Subject: option to convert VAE to bfloat16 (implementation of #9295)

---
 modules/processing.py | 23 ++++++++++++++++++-----
 1 file changed, 18 insertions(+), 5 deletions(-)

(limited to 'modules/processing.py')

diff --git a/modules/processing.py b/modules/processing.py
index 846e4796..f0656882 100644
--- a/modules/processing.py
+++ b/modules/processing.py
@@ -628,20 +628,33 @@ def decode_latent_batch(model, batch, target_device=None, check_for_nans=False):
         sample = decode_first_stage(model, batch[i:i + 1])[0]
 
         if check_for_nans:
+
             try:
                 devices.test_for_nans(sample, "vae")
             except devices.NansException as e:
-                if devices.dtype_vae == torch.float32 or not shared.opts.auto_vae_precision:
+                if shared.opts.auto_vae_precision_bfloat16:
+                    autofix_dtype = torch.bfloat16
+                    autofix_dtype_text = "bfloat16"
+                    autofix_dtype_setting = "Automatically convert VAE to bfloat16"
+                    autofix_dtype_comment = ""
+                elif shared.opts.auto_vae_precision:
+                    autofix_dtype = torch.float32
+                    autofix_dtype_text = "32-bit float"
+                    autofix_dtype_setting = "Automatically revert VAE to 32-bit floats"
+                    autofix_dtype_comment = "\nTo always start with 32-bit VAE, use --no-half-vae commandline flag."
+                else:
+                    raise e
+
+                if devices.dtype_vae == autofix_dtype:
                     raise e
 
                 errors.print_error_explanation(
                     "A tensor with all NaNs was produced in VAE.\n"
-                    "Web UI will now convert VAE into 32-bit float and retry.\n"
-                    "To disable this behavior, disable the 'Automatically revert VAE to 32-bit floats' setting.\n"
-                    "To always start with 32-bit VAE, use --no-half-vae commandline flag."
+                    f"Web UI will now convert VAE into {autofix_dtype_text} and retry.\n"
+                    f"To disable this behavior, disable the '{autofix_dtype_setting}' setting.{autofix_dtype_comment}"
                 )
 
-                devices.dtype_vae = torch.float32
+                devices.dtype_vae = autofix_dtype
                 model.first_stage_model.to(devices.dtype_vae)
                 batch = batch.to(devices.dtype_vae)
 
-- 
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