Add LCM InpaintLegacyDiffuser base

Author: saddam213

OnnxStack.StableDiffusion/Diffusers/LatentConsistency/InpaintLegacyDiffuser.cs

@@ -1,12 +1,80 @@
-using System;
+using Microsoft.Extensions.Logging;
+using Microsoft.ML.OnnxRuntime;
+using Microsoft.ML.OnnxRuntime.Tensors;
+using OnnxStack.Core.Config;
+using OnnxStack.Core.Services;
+using OnnxStack.StableDiffusion.Common;
+using OnnxStack.StableDiffusion.Config;
+using OnnxStack.StableDiffusion.Enums;
+using OnnxStack.StableDiffusion.Helpers;
+using SixLabors.ImageSharp;
+using System;
 using System.Collections.Generic;
 using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
 namespace OnnxStack.StableDiffusion.Diffusers.LatentConsistency
 {
-    internal class InpaintLegacyDiffuser
+    public sealed class InpaintLegacyDiffuser : LatentConsistencyDiffuser
     {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="InpaintLegacyDiffuser"/> class.
+        /// </summary>
+        /// <param name="configuration">The configuration.</param>
+        /// <param name="onnxModelService">The onnx model service.</param>
+        public InpaintLegacyDiffuser(IOnnxModelService onnxModelService, IPromptService promptService, ILogger<LatentConsistencyDiffuser> logger)
+            : base(onnxModelService, promptService, logger)
+        {
+        }
+
+
+        /// <summary>
+        /// Gets the type of the diffuser.
+        /// </summary>
+        public override DiffuserType DiffuserType => DiffuserType.ImageInpaintLegacy;
+
+
+        /// <summary>
+        /// Gets the timesteps.
+        /// </summary>
+        /// <param name="prompt">The prompt.</param>
+        /// <param name="options">The options.</param>
+        /// <param name="scheduler">The scheduler.</param>
+        /// <returns></returns>
+        protected override IReadOnlyList<int> GetTimesteps(PromptOptions prompt, SchedulerOptions options, IScheduler scheduler)
+        {
+            // Image2Image we narrow step the range by the Strength
+            var inittimestep = Math.Min((int)(options.InferenceSteps * options.Strength), options.InferenceSteps);
+            var start = Math.Max(options.InferenceSteps - inittimestep, 0);
+            return scheduler.Timesteps.Skip(start).ToList();
+        }
+
+
+        /// <summary>
+        /// Prepares the latents for inference.
+        /// </summary>
+        /// <param name="prompt">The prompt.</param>
+        /// <param name="options">The options.</param>
+        /// <param name="scheduler">The scheduler.</param>
+        /// <returns></returns>
+        protected override DenseTensor<float> PrepareLatents(IModelOptions model, PromptOptions prompt, SchedulerOptions options, IScheduler scheduler, IReadOnlyList<int> timesteps)
+        {
+            // Image input, decode, add noise, return as latent 0
+            var imageTensor = prompt.InputImage.ToDenseTensor(new[] { 1, 3, options.Height, options.Width });
+            var inputNames = _onnxModelService.GetInputNames(model, OnnxModelType.VaeEncoder);
+            var inputParameters = CreateInputParameters(NamedOnnxValue.CreateFromTensor(inputNames[0], imageTensor));
+            using (var inferResult = _onnxModelService.RunInference(model, OnnxModelType.VaeEncoder, inputParameters))
+            {
+                var sample = inferResult.FirstElementAs<DenseTensor<float>>();
+                var scaledSample = sample
+                    .Add(scheduler.CreateRandomSample(sample.Dimensions, options.InitialNoiseLevel))
+                    .MultiplyBy(model.ScaleFactor);
+
+                var noisySample = scheduler.AddNoise(scaledSample, scheduler.CreateRandomSample(scaledSample.Dimensions), timesteps);
+                if (prompt.BatchCount > 1)
+                    return noisySample.Repeat(prompt.BatchCount);
+
+                return noisySample;
+            }
+        }
     }
 }

OnnxStack.StableDiffusion/Registration.cs

@@ -42,6 +42,7 @@ public static void AddOnnxStackStableDiffusion(this IServiceCollection serviceCo
             //LatentConsistency
             serviceCollection.AddSingleton<IDiffuser, StableDiffusion.Diffusers.LatentConsistency.TextDiffuser>();
             serviceCollection.AddSingleton<IDiffuser, StableDiffusion.Diffusers.LatentConsistency.ImageDiffuser>();
+            serviceCollection.AddSingleton<IDiffuser, StableDiffusion.Diffusers.LatentConsistency.InpaintLegacyDiffuser>();
         }