Update README.md

Signed-off-by: quic-zhanweiw <[email protected]>

Samples/StableDiffusion/README.md

@@ -1,26 +1,35 @@
 # StableDiffusion Sample Code
 
 ## Introduction
-This is sample code for using QNNHelper to load Stable Diffusion QNN models, run the inference and free the resource. 
+This is sample code for using QNNHelper to load Stable Diffusion 1.5 QNN models, run the inference and free the resource. 
 
 ## Stable Diffusion QNN models
 You need to generate Stable Diffusion QNN models according to the guide below before you running it with this sample code:
 https://docs.qualcomm.com/bundle/publicresource/topics/80-64748-1/introduction.html
 
-## time-embedding
-In this sample code, it needs to load 'time-embedding' data which is preprocessed. 
+After the models are ready, please copy them to the following path:
 ```
-time_emb_path = cache_dir + "\\time-embedding\\" + str(user_step) + "\\"
+c:\ai-hub\SD_1.5\models\sd_v1.5\stable_diffusion_v1_5_quantized-textencoder_quantized.bin
+c:\ai-hub\SD_1.5\models\sd_v1.5\stable_diffusion_v1_5_quantized-unet_quantized.bin
+c:\ai-hub\SD_1.5\models\sd_v1.5\stable_diffusion_v1_5_quantized-vaedecoder_quantized.bin
 ```
 
-The code of generate the 'time-embedding' data:
+## time-embedding
+In this sample code, we need to use 'time-embedding' data. The below code can be used to generate the 'time-embedding' data:
 ```
+import os
 import torch
 import numpy as np
 from diffusers.models.embeddings import get_timestep_embedding
+from diffusers import UNet2DConditionModel
+from diffusers import DPMSolverMultistepScheduler
 
 user_step = 20
-time_embeddings = UNet2DConditionModel.from_pretrained('runwayml/stable-diffusion-v1-5', subfolder='unet', cache_dir='./cache/diffusers').time_embedding
+time_embeddings = UNet2DConditionModel.from_pretrained('runwayml/stable-diffusion-v1-5', subfolder='unet', cache_dir='./cache').time_embedding
+scheduler = DPMSolverMultistepScheduler(num_train_timesteps=1000, beta_start=0.00085, beta_end=0.012, beta_schedule="scaled_linear")
+
+def get_timestep(step):
+    return np.int32(scheduler.timesteps.numpy()[step])
 
 def get_time_embedding(timestep):
     timestep = torch.tensor([timestep])
@@ -29,7 +38,10 @@ def get_time_embedding(timestep):
     return emb
 
 def gen_time_embedding():
-    time_emb_path = "\\models\\cache\\time-embedding\\" + str(user_step) + "\\"
+    scheduler.set_timesteps(user_step)
+    
+    time_emb_path = ".\\models\\time-embedding_v1.5\\" + str(user_step) + "\\"
+    os.mkdir(time_emb_path)
     for step in range(user_step):
         file_path = time_emb_path + str(step) + ".raw"
         timestep = get_timestep(step)
@@ -38,20 +50,61 @@ def gen_time_embedding():
 
 # Only needs to executed once for generating time enbedding data to app folder.
 # Modify 'user_step' to '20', '30', '50' to generate 'time_embedding' for steps - '20', '30', '50'.
+
+user_step = 20
+gen_time_embedding()
+
+user_step = 30
+gen_time_embedding()
+
+user_step = 50
 gen_time_embedding()
 ```
 
-## clip-vit-base-patch32
-In this sample code, it needs *clip-vit-base-patch32* data. 
+After generated the 'time-embedding' data, please copy them to the following path:
 ```
-tokenizer = CLIPTokenizer.from_pretrained(cache_dir + '\\clip-vit-base-patch32\\', local_files_only=True)
+c:\ai-hub\SD_1.5\models\time-embedding\20
+c:\ai-hub\SD_1.5\models\time-embedding\30
+c:\ai-hub\SD_1.5\models\time-embedding\50
 ```
 
-You can download the file below from 'https://huggingface.co/openai/clip-vit-base-patch32/tree/main' and save them to foldet 'clip-vit-base-patch32':
+## CLIP ViT-L/14 model
+In this sample code, we need CLIP ViT-L/14 as text encoder. You can download the file below from 'https://huggingface.co/openai/clip-vit-large-patch14/tree/main' and save them to foldet 'clip-vit-large-patch14'. 
+Rename the files to below:
 ```
-config.json
 merges.txt
 special_tokens_map.json
 tokenizer_config.json
 vocab.json
 ```
+
+After downloaded the model, please copy them to the following path:
+```
+c:\ai-hub\SD_1.5\models\clip-vit-large-patch14
+```
+
+## Run the sample code
+Download the sample code from the following link: <br>
+https://github.com/quic/ai-engine-direct-helper/blob/main/Samples/StableDiffusion/StableDiffusion.py
+
+After downloaded the sample code, please copy them to the following path:
+```
+c:\ai-hub\SD_1.5\
+```
+
+Run the sample code:
+```
+python StableDiffusion.py
+```
+
+## Output
+The output image will be saved to the following path:
+```
+c:\ai-hub\SD_1.5\images\
+```
+
+## Reference
+You need to setup the QNNHelper environment before you run the sample code. Below is the guide on how to setup the QNNHelper environment:<br>
+https://github.com/quic/ai-engine-direct-helper/blob/main/README.md <br>
+https://github.com/quic/ai-engine-direct-helper/blob/main/Docs/User_Guide.md
+