feat(ai): add 'num_inference_steps' to I2I,I2V and upscale pipeliens

This commit adds support for the `num_inference_steps` parameter to the
I2I, I2V and upscale pipelines. It also fixes a incorrect latencyScore
calculation for the bytedance model.

core/ai.go

@@ -5,6 +5,7 @@ import (
 	"encoding/json"
 	"errors"
 	"os"
+	"regexp"
 	"strconv"
 	"strings"
 
@@ -85,3 +86,19 @@ func ParseAIModelConfigs(config string) ([]AIModelConfig, error) {
 
 	return configs, nil
 }
+
+// parseStepsFromModelID parses the number of inference steps from the model ID suffix.
+func ParseStepsFromModelID(modelID *string, defaultSteps float64) float64 {
+	numInferenceSteps := defaultSteps
+
+	// Regular expression to find "_<number>step" pattern anywhere in the model ID.
+	stepPattern := regexp.MustCompile(`_(\d+)step`)
+	matches := stepPattern.FindStringSubmatch(*modelID)
+	if len(matches) == 2 {
+		if parsedSteps, err := strconv.Atoi(matches[1]); err == nil {
+			numInferenceSteps = float64(parsedSteps)
+		}
+	}
+
+	return numInferenceSteps
+}

server/ai_process.go

@@ -122,6 +122,11 @@ func submitTextToImage(ctx context.Context, params aiRequestParams, sess *AISess
 	if req.NumInferenceSteps != nil {
 		numInferenceSteps = float64(*req.NumInferenceSteps)
 	}
+	// Handle special case for SDXL-Lightning model.
+	if strings.HasPrefix(*req.ModelId, "ByteDance/SDXL-Lightning") {
+		numInferenceSteps = core.ParseStepsFromModelID(req.ModelId, 8)
+	}
+
 	sess.LatencyScore = took.Seconds() / float64(outPixels) / (numImages * numInferenceSteps)
 
 	return resp.JSON200, nil
@@ -202,13 +207,22 @@ func submitImageToImage(ctx context.Context, params aiRequestParams, sess *AISes
 	}
 
 	// TODO: Refine this rough estimate in future iterations.
-	// TODO: Default values for the number of images is currently hardcoded.
+	// TODO: Default values for the number of images and inference steps are currently hardcoded.
 	// These should be managed by the nethttpmiddleware. Refer to issue LIV-412 for more details.
 	numImages := float64(1)
 	if req.NumImagesPerPrompt != nil {
 		numImages = float64(*req.NumImagesPerPrompt)
 	}
-	sess.LatencyScore = took.Seconds() / float64(outPixels) / numImages
+	numInferenceSteps := float64(100)
+	if req.NumInferenceSteps != nil {
+		numInferenceSteps = float64(*req.NumInferenceSteps)
+	}
+	// Handle special case for SDXL-Lightning model.
+	if strings.HasPrefix(*req.ModelId, "ByteDance/SDXL-Lightning") {
+		numInferenceSteps = core.ParseStepsFromModelID(req.ModelId, 8)
+	}
+
+	sess.LatencyScore = took.Seconds() / float64(outPixels) / (numImages * numInferenceSteps)
 
 	return resp.JSON200, nil
 }
@@ -303,7 +317,13 @@ func submitImageToVideo(ctx context.Context, params aiRequestParams, sess *AISes
 	}
 
 	// TODO: Refine this rough estimate in future iterations
-	sess.LatencyScore = took.Seconds() / float64(outPixels)
+	// TODO: Default values for the number of inference steps is currently hardcoded.
+	// These should be managed by the nethttpmiddleware. Refer to issue LIV-412 for more details.
+	numInferenceSteps := float64(25)
+	if req.NumInferenceSteps != nil {
+		numInferenceSteps = float64(*req.NumInferenceSteps)
+	}
+	sess.LatencyScore = took.Seconds() / float64(outPixels) / numInferenceSteps
 
 	return &res, nil
 }
@@ -383,7 +403,13 @@ func submitUpscale(ctx context.Context, params aiRequestParams, sess *AISession,
 	}
 
 	// TODO: Refine this rough estimate in future iterations
-	sess.LatencyScore = took.Seconds() / float64(outPixels)
+	// TODO: Default values for the number of inference steps is currently hardcoded.
+	// These should be managed by the nethttpmiddleware. Refer to issue LIV-412 for more details.
+	numInferenceSteps := float64(75)
+	if req.NumInferenceSteps != nil {
+		numInferenceSteps = float64(*req.NumInferenceSteps)
+	}
+	sess.LatencyScore = took.Seconds() / float64(outPixels) / numInferenceSteps
 
 	return resp.JSON200, nil
 }