From 64c594869135354a38353551bd58a93e15bd5b85 Mon Sep 17 00:00:00 2001
From: Volpeon <git@volpeon.ink>
Date: Sun, 2 Oct 2022 20:57:43 +0200
Subject: Small performance improvements

---
 pipelines/stable_diffusion/vlpn_stable_diffusion.py | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

(limited to 'pipelines')

diff --git a/pipelines/stable_diffusion/vlpn_stable_diffusion.py b/pipelines/stable_diffusion/vlpn_stable_diffusion.py
index b4c85e9..8fbe5f9 100644
--- a/pipelines/stable_diffusion/vlpn_stable_diffusion.py
+++ b/pipelines/stable_diffusion/vlpn_stable_diffusion.py
@@ -223,15 +223,16 @@ class VlpnStableDiffusion(DiffusionPipeline):
         # Unlike in other pipelines, latents need to be generated in the target device
         # for 1-to-1 results reproducibility with the CompVis implementation.
         # However this currently doesn't work in `mps`.
-        latents_device = "cpu" if self.device.type == "mps" else self.device
+        latents_dtype = text_embeddings.dtype
         latents_shape = (batch_size, self.unet.in_channels, height // 8, width // 8)
         if latents is None:
-            latents = torch.randn(
-                latents_shape,
-                generator=generator,
-                device=latents_device,
-                dtype=text_embeddings.dtype,
-            )
+            if self.device.type == "mps":
+                # randn does not exist on mps
+                latents = torch.randn(latents_shape, generator=generator, device="cpu", dtype=latents_dtype).to(
+                    self.device
+                )
+            else:
+                latents = torch.randn(latents_shape, generator=generator, device=self.device, dtype=latents_dtype)
         elif isinstance(latents, PIL.Image.Image):
             latents = preprocess(latents, width, height)
             latent_dist = self.vae.encode(latents.to(self.device)).latent_dist
@@ -259,7 +260,8 @@ class VlpnStableDiffusion(DiffusionPipeline):
         else:
             if latents.shape != latents_shape:
                 raise ValueError(f"Unexpected latents shape, got {latents.shape}, expected {latents_shape}")
-            latents = latents.to(self.device)
+            if latents.device != self.device:
+                raise ValueError(f"Unexpected latents device, got {latents.device}, expected {self.device}")
 
         # if we use LMSDiscreteScheduler, let's make sure latents are multiplied by sigmas
         if ensure_sigma:
-- 
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