Llama3 mmlu correction (#2797)

* Update continuation template YAML for MMLU task with new generation and filtering options

* Refactor filter_list structure in continuation template YAML for improved readability

* Add 'take_first' function to filter_list in continuation template YAML

* Update filter_list in continuation template YAML to use 'strict_match' and modify filtering functions

* Add 'do_sample' option to generation_kwargs in MMLU template YAML

lm_eval/tasks/llama3/instruct/mmlu/_continuation_template_yaml

@@ -18,6 +18,7 @@ metric_list:
       - "\\$"
       - "\\.$"
 generation_kwargs:
+  do_sample: false
   until:
     - "."
   max_gen_toks: 10

lm_eval/tasks/llama3/instruct/mmlu_pro/_default_template_yaml

@@ -18,6 +18,7 @@ metric_list:
       - "\\$"
       - "\\.$"
 generation_kwargs:
+  do_sample: false
   until:
     - "."
   max_gen_toks: 1024