From 87e8b9a2ab3f033e7fdadbb2fe258857915980ac Mon Sep 17 00:00:00 2001
From: AUTOMATIC <16777216c@gmail.com>
Date: Fri, 16 Sep 2022 09:47:03 +0300
Subject: prevent replacing torch_randn globally (instead replacing
 k_diffusion.sampling.torch) and add a setting to disable this all

---
 modules/sd_samplers.py | 25 ++++++++++++++++++++-----
 1 file changed, 20 insertions(+), 5 deletions(-)

(limited to 'modules/sd_samplers.py')

diff --git a/modules/sd_samplers.py b/modules/sd_samplers.py
index f77fe43f..d478c5bc 100644
--- a/modules/sd_samplers.py
+++ b/modules/sd_samplers.py
@@ -175,7 +175,19 @@ def extended_trange(count, *args, **kwargs):
         shared.total_tqdm.update()
 
 
-original_randn_like = torch.randn_like
+class TorchHijack:
+    def __init__(self, kdiff_sampler):
+        self.kdiff_sampler = kdiff_sampler
+
+    def __getattr__(self, item):
+        if item == 'randn_like':
+            return self.kdiff_sampler.randn_like
+
+        if hasattr(torch, item):
+            return getattr(torch, item)
+
+        raise AttributeError("'{}' object has no attribute '{}'".format(type(self).__name__, item))
+
 
 class KDiffusionSampler:
     def __init__(self, funcname, sd_model):
@@ -186,8 +198,6 @@ class KDiffusionSampler:
         self.sampler_noises = None
         self.sampler_noise_index = 0
 
-        k_diffusion.sampling.torch.randn_like = self.randn_like
-
     def callback_state(self, d):
         store_latent(d["denoised"])
 
@@ -200,8 +210,7 @@ class KDiffusionSampler:
         if noise is not None and x.shape == noise.shape:
             res = noise
         else:
-            print('generating')
-            res = original_randn_like(x)
+            res = torch.randn_like(x)
 
         self.sampler_noise_index += 1
         return res
@@ -223,6 +232,9 @@ class KDiffusionSampler:
         if hasattr(k_diffusion.sampling, 'trange'):
             k_diffusion.sampling.trange = lambda *args, **kwargs: extended_trange(*args, **kwargs)
 
+        if self.sampler_noises is not None:
+            k_diffusion.sampling.torch = TorchHijack(self)
+
         return self.func(self.model_wrap_cfg, xi, sigma_sched, extra_args={'cond': conditioning, 'uncond': unconditional_conditioning, 'cond_scale': p.cfg_scale}, disable=False, callback=self.callback_state)
 
     def sample(self, p, x, conditioning, unconditional_conditioning):
@@ -232,6 +244,9 @@ class KDiffusionSampler:
         if hasattr(k_diffusion.sampling, 'trange'):
             k_diffusion.sampling.trange = lambda *args, **kwargs: extended_trange(*args, **kwargs)
 
+        if self.sampler_noises is not None:
+            k_diffusion.sampling.torch = TorchHijack(self)
+
         samples_ddim = self.func(self.model_wrap_cfg, x, sigmas, extra_args={'cond': conditioning, 'uncond': unconditional_conditioning, 'cond_scale': p.cfg_scale}, disable=False, callback=self.callback_state)
         return samples_ddim
 
-- 
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