From 0d5dc9a6e7f6362e423a06bf0e75dd5854025394 Mon Sep 17 00:00:00 2001
From: AUTOMATIC1111 <16777216c@gmail.com>
Date: Wed, 9 Aug 2023 08:43:31 +0300
Subject: rework RNG to use generators instead of generating noises beforehand

---
 modules/sd_samplers_common.py | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

(limited to 'modules/sd_samplers_common.py')

diff --git a/modules/sd_samplers_common.py b/modules/sd_samplers_common.py
index adda963b..97bc0804 100644
--- a/modules/sd_samplers_common.py
+++ b/modules/sd_samplers_common.py
@@ -1,5 +1,5 @@
 import inspect
-from collections import namedtuple, deque
+from collections import namedtuple
 import numpy as np
 import torch
 from PIL import Image
@@ -132,10 +132,15 @@ replace_torchsde_browinan()
 
 
 class TorchHijack:
-    def __init__(self, sampler_noises):
-        # Using a deque to efficiently receive the sampler_noises in the same order as the previous index-based
-        # implementation.
-        self.sampler_noises = deque(sampler_noises)
+    """This is here to replace torch.randn_like of k-diffusion.
+
+    k-diffusion has random_sampler argument for most samplers, but not for all, so
+    this is needed to properly replace every use of torch.randn_like.
+
+    We need to replace to make images generated in batches to be same as images generated individually."""
+
+    def __init__(self, p):
+        self.rng = p.rng
 
     def __getattr__(self, item):
         if item == 'randn_like':
@@ -147,12 +152,7 @@ class TorchHijack:
         raise AttributeError(f"'{type(self).__name__}' object has no attribute '{item}'")
 
     def randn_like(self, x):
-        if self.sampler_noises:
-            noise = self.sampler_noises.popleft()
-            if noise.shape == x.shape:
-                return noise
-
-        return devices.randn_like(x)
+        return self.rng.next()
 
 
 class Sampler:
@@ -215,7 +215,7 @@ class Sampler:
         self.eta = p.eta if p.eta is not None else getattr(opts, self.eta_option_field, 0.0)
         self.s_min_uncond = getattr(p, 's_min_uncond', 0.0)
 
-        k_diffusion.sampling.torch = TorchHijack(self.sampler_noises if self.sampler_noises is not None else [])
+        k_diffusion.sampling.torch = TorchHijack(p)
 
         extra_params_kwargs = {}
         for param_name in self.extra_params:
-- 
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