When running the make evaluate command with the specified parameters, an error occurs indicating that the VLLMModelConfig initializer received an unexpected keyword argument.

Steps to Reproduce:

1. Set up the environment as per the project's guidelines.
2. Execute the following command:

make evaluate MODEL=deepseek-ai/DeepSeek-R1-Distill-Qwen-1.5B TASK=math_500

Expected Behavior: The evaluation process should complete without errors, utilizing the specified model and task parameters.

Actual Behavior: The following error message is displayed:

TypeError: VLLMModelConfig.__init__() got an unexpected keyword argument ''

Analysis: Upon investigation, it appears that the MODEL_ARGS variable in the Makefile's evaluate target may include an empty $(PARALLEL_ARGS) variable, leading to consecutive commas and resulting in an empty string being passed as a keyword argument.

Proposed Solution: Modify the MODEL_ARGS assignment in the Makefile to conditionally include $(PARALLEL_ARGS) only if it's not empty:

MODEL_ARGS="pretrained=$(MODEL),dtype=float16$(if $(PARALLEL_ARGS),,$(PARALLEL_ARGS)),max_model_length=32768,gpu_memory_utilization=0.8"

This change ensures that no extra comma is introduced when $(PARALLEL_ARGS) is empty, preventing the unintended empty string argument.