model-conversion : add qat-q4 quantization targets (#15588)

This commit adds two targets to the Makefile for quantizing of
Quantization Aware Trained (QAT) models to Q4_0 format.

The motivation for this is that this sets the token embedding and the
output tensors data types to Q8_0 instead of the default Q6_K. This is
someting that we wish to enforce for QAT Q4_0 models that are to be
uploaded to ggml-org on Huggingface to guarantee the best quality.

examples/model-conversion/Makefile

@@ -1,4 +1,5 @@
-# Validation functions
+MAKEFLAGS += --no-print-directory
+
 define validate_model_path
 	@if [ -z "$(MODEL_PATH)" ]; then \
 		echo "Error: MODEL_PATH must be provided either as:"; \
@@ -17,6 +18,13 @@ define validate_embedding_model_path
 	fi
 endef
 
+define quantize_model
+	@CONVERTED_MODEL="$(1)" QUANTIZED_TYPE="$(QUANTIZED_TYPE)" \
+	TOKEN_EMBD_TYPE="$(TOKEN_EMBD_TYPE)" OUTPUT_TYPE="$(OUTPUT_TYPE)" \
+	./scripts/utils/quantize.sh "$(1)" "$(QUANTIZED_TYPE)" "$(TOKEN_EMBD_TYPE)" "$(OUTPUT_TYPE)"
+	@echo "Export the quantized model path to $(2) variable in your environment"
+endef
+
 ###
 ### Casual Model targets/recipes
 ###
@@ -67,9 +75,15 @@ causal-quantize-Q8_0: causal-quantize-model
 causal-quantize-Q4_0: QUANTIZED_TYPE = Q4_0
 causal-quantize-Q4_0: causal-quantize-model
 
+# For Quantization Aware Trained (QAT) models in Q4_0 we explicitly set the
+# token embedding and output types to Q8_0 instead of the default Q6_K.
+causal-quantize-qat-Q4_0: QUANTIZED_TYPE = Q4_0
+causal-quantize-qat-Q4_0: TOKEN_EMBD_TYPE = Q8_0
+causal-quantize-qat-Q4_0: OUTPUT_TYPE = Q8_0
+causal-quantize-qat-Q4_0: causal-quantize-model
+
 causal-quantize-model:
-	@CONVERTED_MODEL="$(CONVERTED_MODEL)" QUANTIZED_TYPE="$(QUANTIZED_TYPE)" ./scripts/utils/quantize.sh ${CONVERTED_MODEL} ${QUANTIZED_TYPE}
+	$(call quantize_model,$(CONVERTED_MODEL),QUANTIZED_MODEL)
-	@echo "Export the quantized model path to QUANTIZED_MODEL variable in your environment"
 
 causal-run-quantized-model:
 	@QUANTIZED_MODEL="$(QUANTIZED_MODEL)" ./scripts/causal/run-converted-model.sh ${QUANTIZED_MODEL}
@@ -117,9 +131,15 @@ embedding-quantize-Q8_0: embedding-quantize-model
 embedding-quantize-Q4_0: QUANTIZED_TYPE = Q4_0
 embedding-quantize-Q4_0: embedding-quantize-model
 
+# For Quantization Aware Trained (QAT) models in Q4_0 we explicitly set the
+# token embedding and output types to Q8_0 instead of the default Q6_K.
+embedding-quantize-qat-Q4_0: QUANTIZED_TYPE = Q4_0
+embedding-quantize-qat-Q4_0: TOKEN_EMBD_TYPE = Q8_0
+embedding-quantize-qat-Q4_0: OUTPUT_TYPE = Q8_0
+embedding-quantize-qat-Q4_0: embedding-quantize-model
+
 embedding-quantize-model:
-	@./scripts/utils/quantize.sh ${CONVERTED_EMBEDDING_MODEL} ${QUANTIZED_TYPE}
+	$(call quantize_model,$(CONVERTED_EMBEDDING_MODEL),QUANTIZED_EMBEDDING_MODEL)
-	@echo "Export the quantized model path to QUANTIZED_EMBEDDING_MODEL variable in your environment"
 
 embedding-run-quantized-model:
 	@./scripts/embedding/run-converted-model.sh ${QUANTIZED_EMBEDDING_MODEL}

examples/model-conversion/README.md

@@ -137,6 +137,18 @@ Then the quantized model can be run using the following command:
 (venv) $ make causal-run-quantized-model
 ```
 
+### Quantizing QAT (Quantization Aware Training) models
+When quantizing to `Q4_0`, the default data type for the token embedding weights
+will be `Q6_K`. For models that are going to be uploaded to ggml-org it is
+recommended to use `Q8_0` instead for the embeddings and output tensors.
+The reason is that although `Q6_K` is smaller in size, it requires more compute
+to unpack, which can hurt performance during output generation when the entire
+embedding matrix must be dequantized to compute vocabulary logits. `Q8_0`
+provides practically full quality with better computational efficiency.
+```console
+(venv) $ make causal-quantize-qat-Q4_0
+```
+
 
 ## Embedding Language Model Conversion
 
@@ -238,6 +250,18 @@ Then the quantized model can be run using the following command:
 (venv) $ make embedding-run-quantized-model
 ```
 
+### Quantizing QAT (Quantization Aware Training) models
+When quantizing to `Q4_0`, the default data type for the token embedding weights
+will be `Q6_K`. For models that are going to be uploaded to ggml-org it is
+recommended to use `Q8_0` instead for the embeddings and output tensors.
+The reason is that although `Q6_K` is smaller in size, it requires more compute
+to unpack, which can hurt performance during output generation when the entire
+embedding matrix must be dequantized to compute vocabulary logits. `Q8_0`
+provides practically full quality with better computational efficiency.
+```console
+(venv) $ make embedding-quantize-qat-Q4_0
+```
+
 ## Perplexity Evaluation
 
 ### Simple perplexity evaluation

examples/model-conversion/scripts/utils/quantize.sh

@@ -4,6 +4,8 @@ set -e
 
 CONVERTED_MODEL="${1:-"$CONVERTED_MODEL"}"
 QUANTIZED_TYPE="${2:-"$QUANTIZED_TYPE"}"
+TOKEN_EMBD_TYPE="${3:-"${TOKEN_EMBD_TYPE}"}"
+OUTPUT_TYPE="${4:-"${OUTPUT_TYPE}"}"
 QUANTIZED_MODEL=$CONVERTED_MODEL
 
 # Final check if we have a model path
@@ -14,6 +16,11 @@ if [ -z "$CONVERTED_MODEL" ]; then
     exit 1
 fi
 
+if [ -z "$QUANTIZED_TYPE" ]; then
+    echo "Error: QUANTIZED_TYPE is required" >&2
+    exit 1
+fi
+
 echo $CONVERTED_MODEL
 
 # Process the quantized model filename
@@ -26,9 +33,16 @@ else
     exit 1
 fi
 
-
 cmake --build ../../build --target llama-quantize -j8
 
-../../build/bin/llama-quantize $CONVERTED_MODEL $QUANTIZED_MODEL $QUANTIZED_TYPE
+echo $TOKEN_EMBD_TYPE
+echo $OUTPUT_TYPE
+
+CMD_ARGS=("../../build/bin/llama-quantize")
+[[ -n "$TOKEN_EMBD_TYPE" ]] && CMD_ARGS+=("--token-embedding-type" "$TOKEN_EMBD_TYPE")
+[[ -n "$OUTPUT_TYPE" ]]     && CMD_ARGS+=("--output-tensor-type" "$OUTPUT_TYPE")
+CMD_ARGS+=("$CONVERTED_MODEL" "$QUANTIZED_MODEL" "$QUANTIZED_TYPE")
+
+"${CMD_ARGS[@]}"
 
 echo "Quantized model saved to: $QUANTIZED_MODEL"