model-conversion : remove -st targets for converted model (#18689)

This commit removes the '-st` make target for running the converted
embedding model.

The motivation for this is that the pooling type is now part of the
.gguf metdata of the model and this is used by llama-debug when running
the model. So there is no need to specify the pooling type separately
any more.

The commit also adds an option to specify the type of normalization
applied to the output embeddings when running the converted model.

And the readme documentation has been  updated to reflect these changes.

examples/model-conversion/Makefile

@@ -138,16 +138,13 @@ embedding-run-original-model-st: embedding-run-original-model
 embedding-run-converted-model:
 	@./scripts/embedding/run-converted-model.sh $(CONVERTED_EMBEDDING_MODEL) \
 	$(if $(PROMPTS_FILE),--prompts-file "$(PROMPTS_FILE)") \
-	$(if $(USE_POOLING),--pooling)
-
-embedding-run-converted-model-st: USE_POOLING=1
-embedding-run-converted-model-st: embedding-run-converted-model
+	$(if $(EMBD_NORMALIZE),--embd-normalize "$(EMBD_NORMALIZE)")
 
 embedding-verify-logits: embedding-run-original-model embedding-run-converted-model
 	@./scripts/embedding/compare-embeddings-logits.sh \
 	$(if $(PROMPTS_FILE),--prompts-file "$(PROMPTS_FILE)")
 
-embedding-verify-logits-st: embedding-run-original-model-st embedding-run-converted-model-st
+embedding-verify-logits-st: embedding-run-original-model-st embedding-run-converted-model
 	@./scripts/embedding/compare-embeddings-logits.sh \
 	$(if $(PROMPTS_FILE),--prompts-file "$(PROMPTS_FILE)")
 

examples/model-conversion/README.md

@@ -198,14 +198,13 @@ model, and the other is a text file which allows for manual visual inspection.
 
 #### Using SentenceTransformer with numbered layers
 For models that have numbered SentenceTransformer layers (01_Pooling, 02_Dense,
-03_Dense, 04_Normalize), use the `-st` targets to apply all these layers:
+03_Dense, 04_Normalize), these will be applied automatically when running the
+converted model but currently there is a separate target to run the original
+version:
 
 ```console
 # Run original model with SentenceTransformer (applies all numbered layers)
 (venv) $ make embedding-run-original-model-st
-
-# Run converted model with pooling enabled
-(venv) $ make embedding-run-converted-model-st
 ```
 
 This will use the SentenceTransformer library to load and run the model, which
@@ -213,6 +212,17 @@ automatically applies all the numbered layers in the correct order. This is
 particularly useful when comparing with models that should include these
 additional transformation layers beyond just the base model output.
 
+The type of normalization can be specified for the converted model but is not
+strictly necessary as the verification uses cosine similarity and the magnitude
+of the output vectors does not affect this. But the normalization type can be
+specified as an argument to the target which might be useful for manual
+inspection:
+```console
+(venv) $ make embedding-verify-logits-st EMBD_NORMALIZE=1
+```
+The original model will apply the normalization according to the normalization
+layer specified in the modules.json configuration file.
+
 ### Model conversion
 After updates have been made to [gguf-py](../../gguf-py) to add support for the
 new model the model can be converted to GGUF format using the following command:

examples/model-conversion/scripts/embedding/run-converted-model.sh

@@ -5,7 +5,7 @@ set -e
 # Parse command line arguments
 CONVERTED_MODEL=""
 PROMPTS_FILE=""
-USE_POOLING=""
+EMBD_NORMALIZE="2"
 
 while [[ $# -gt 0 ]]; do
     case $1 in
@@ -13,9 +13,9 @@ while [[ $# -gt 0 ]]; do
             PROMPTS_FILE="$2"
             shift 2
             ;;
-        --pooling)
-            USE_POOLING="1"
-            shift
+        --embd-normalize)
+            EMBD_NORMALIZE="$2"
+            shift 2
             ;;
         *)
             if [ -z "$CONVERTED_MODEL" ]; then
@@ -51,8 +51,4 @@ fi
 echo $CONVERTED_MODEL
 
 cmake --build ../../build --target llama-debug -j8
-if [ -n "$USE_POOLING" ]; then
-    ../../build/bin/llama-debug -m "$CONVERTED_MODEL" --embedding --pooling mean -p "$PROMPT" --save-logits
-else
-    ../../build/bin/llama-debug -m "$CONVERTED_MODEL" --embedding --pooling none -p "$PROMPT" --save-logits
-fi
+../../build/bin/llama-debug -m "$CONVERTED_MODEL" --embedding -p "$PROMPT" --save-logits --embd-normalize $EMBD_NORMALIZE