switch mmlu variants over to using

lm_eval/tasks/mmlu/default/mmlu_astronomy.yaml

 "dataset_name": "astronomy"
 "description": "The following are multiple choice questions (with answers) about astronomy.\n\
   \n"
-"group": "mmlu_stem_tasks"
+"tag": "mmlu_stem_tasks"
 "include": "_default_template_yaml"
 "task": "mmlu_astronomy"
 "task_alias": "astronomy"

lm_eval/tasks/mmlu/default/mmlu_business_ethics.yaml

 "dataset_name": "business_ethics"
 "description": "The following are multiple choice questions (with answers) about business\
   \ ethics.\n\n"
-"group": "mmlu_other_tasks"
+"tag": "mmlu_other_tasks"
 "include": "_default_template_yaml"
 "task": "mmlu_business_ethics"
 "task_alias": "business_ethics"

lm_eval/tasks/mmlu/default/mmlu_clinical_knowledge.yaml

 "dataset_name": "clinical_knowledge"
 "description": "The following are multiple choice questions (with answers) about clinical\
   \ knowledge.\n\n"
-"group": "mmlu_other_tasks"
+"tag": "mmlu_other_tasks"
 "include": "_default_template_yaml"
 "task": "mmlu_clinical_knowledge"
 "task_alias": "clinical_knowledge"

lm_eval/tasks/mmlu/default/mmlu_college_biology.yaml

 "dataset_name": "college_biology"
 "description": "The following are multiple choice questions (with answers) about college\
   \ biology.\n\n"
-"group": "mmlu_stem_tasks"
+"tag": "mmlu_stem_tasks"
 "include": "_default_template_yaml"
 "task": "mmlu_college_biology"
 "task_alias": "college_biology"

lm_eval/tasks/mmlu/default/mmlu_college_chemistry.yaml

 "dataset_name": "college_chemistry"
 "description": "The following are multiple choice questions (with answers) about college\
   \ chemistry.\n\n"
-"group": "mmlu_stem_tasks"
+"tag": "mmlu_stem_tasks"
 "include": "_default_template_yaml"
 "task": "mmlu_college_chemistry"
 "task_alias": "college_chemistry"

lm_eval/tasks/mmlu/default/mmlu_college_computer_science.yaml

 "dataset_name": "college_computer_science"
 "description": "The following are multiple choice questions (with answers) about college\
   \ computer science.\n\n"
-"group": "mmlu_stem_tasks"
+"tag": "mmlu_stem_tasks"
 "include": "_default_template_yaml"
 "task": "mmlu_college_computer_science"
 "task_alias": "college_computer_science"

lm_eval/tasks/mmlu/default/mmlu_college_mathematics.yaml

 "dataset_name": "college_mathematics"
 "description": "The following are multiple choice questions (with answers) about college\
   \ mathematics.\n\n"
-"group": "mmlu_stem_tasks"
+"tag": "mmlu_stem_tasks"
 "include": "_default_template_yaml"
 "task": "mmlu_college_mathematics"
 "task_alias": "college_mathematics"

lm_eval/tasks/mmlu/default/mmlu_college_medicine.yaml

 "dataset_name": "college_medicine"
 "description": "The following are multiple choice questions (with answers) about college\
   \ medicine.\n\n"
-"group": "mmlu_other_tasks"
+"tag": "mmlu_other_tasks"
 "include": "_default_template_yaml"
 "task": "mmlu_college_medicine"
 "task_alias": "college_medicine"

lm_eval/tasks/mmlu/default/mmlu_college_physics.yaml

 "dataset_name": "college_physics"
 "description": "The following are multiple choice questions (with answers) about college\
   \ physics.\n\n"
-"group": "mmlu_stem_tasks"
+"tag": "mmlu_stem_tasks"
 "include": "_default_template_yaml"
 "task": "mmlu_college_physics"
 "task_alias": "college_physics"

lm_eval/tasks/mmlu/default/mmlu_computer_security.yaml

 "dataset_name": "computer_security"
 "description": "The following are multiple choice questions (with answers) about computer\
   \ security.\n\n"
-"group": "mmlu_stem_tasks"
+"tag": "mmlu_stem_tasks"
 "include": "_default_template_yaml"
 "task": "mmlu_computer_security"
 "task_alias": "computer_security"

lm_eval/tasks/mmlu/default/mmlu_conceptual_physics.yaml

 "dataset_name": "conceptual_physics"
 "description": "The following are multiple choice questions (with answers) about conceptual\
   \ physics.\n\n"
-"group": "mmlu_stem_tasks"
+"tag": "mmlu_stem_tasks"
 "include": "_default_template_yaml"
 "task": "mmlu_conceptual_physics"
 "task_alias": "conceptual_physics"

lm_eval/tasks/mmlu/default/mmlu_econometrics.yaml

 "dataset_name": "econometrics"
 "description": "The following are multiple choice questions (with answers) about econometrics.\n\
   \n"
-"group": "mmlu_social_sciences_tasks"
+"tag": "mmlu_social_sciences_tasks"
 "include": "_default_template_yaml"
 "task": "mmlu_econometrics"
 "task_alias": "econometrics"

lm_eval/tasks/mmlu/default/mmlu_electrical_engineering.yaml

 "dataset_name": "electrical_engineering"
 "description": "The following are multiple choice questions (with answers) about electrical\
   \ engineering.\n\n"
-"group": "mmlu_stem_tasks"
+"tag": "mmlu_stem_tasks"
 "include": "_default_template_yaml"
 "task": "mmlu_electrical_engineering"
 "task_alias": "electrical_engineering"

lm_eval/tasks/mmlu/default/mmlu_elementary_mathematics.yaml

 "dataset_name": "elementary_mathematics"
 "description": "The following are multiple choice questions (with answers) about elementary\
   \ mathematics.\n\n"
-"group": "mmlu_stem_tasks"
+"tag": "mmlu_stem_tasks"
 "include": "_default_template_yaml"
 "task": "mmlu_elementary_mathematics"
 "task_alias": "elementary_mathematics"

lm_eval/tasks/mmlu/default/mmlu_formal_logic.yaml

 "dataset_name": "formal_logic"
 "description": "The following are multiple choice questions (with answers) about formal\
   \ logic.\n\n"
-"group": "mmlu_humanities_tasks"
+"tag": "mmlu_humanities_tasks"
 "include": "_default_template_yaml"
 "task": "mmlu_formal_logic"
 "task_alias": "formal_logic"

lm_eval/tasks/mmlu/default/mmlu_global_facts.yaml

 "dataset_name": "global_facts"
 "description": "The following are multiple choice questions (with answers) about global\
   \ facts.\n\n"
-"group": "mmlu_other_tasks"
+"tag": "mmlu_other_tasks"
 "include": "_default_template_yaml"
 "task": "mmlu_global_facts"
 "task_alias": "global_facts"

lm_eval/tasks/mmlu/default/mmlu_high_school_biology.yaml

 "dataset_name": "high_school_biology"
 "description": "The following are multiple choice questions (with answers) about high\
   \ school biology.\n\n"
-"group": "mmlu_stem_tasks"
+"tag": "mmlu_stem_tasks"
 "include": "_default_template_yaml"
 "task": "mmlu_high_school_biology"
 "task_alias": "high_school_biology"

lm_eval/tasks/mmlu/default/mmlu_high_school_chemistry.yaml

 "dataset_name": "high_school_chemistry"
 "description": "The following are multiple choice questions (with answers) about high\
   \ school chemistry.\n\n"
-"group": "mmlu_stem_tasks"
+"tag": "mmlu_stem_tasks"
 "include": "_default_template_yaml"
 "task": "mmlu_high_school_chemistry"
 "task_alias": "high_school_chemistry"

lm_eval/tasks/mmlu/default/mmlu_high_school_computer_science.yaml

 "dataset_name": "high_school_computer_science"
 "description": "The following are multiple choice questions (with answers) about high\
   \ school computer science.\n\n"
-"group": "mmlu_stem_tasks"
+"tag": "mmlu_stem_tasks"
 "include": "_default_template_yaml"
 "task": "mmlu_high_school_computer_science"
 "task_alias": "high_school_computer_science"

lm_eval/tasks/mmlu/default/mmlu_high_school_european_history.yaml

 "dataset_name": "high_school_european_history"
 "description": "The following are multiple choice questions (with answers) about high\
   \ school european history.\n\n"
-"group": "mmlu_humanities_tasks"
+"tag": "mmlu_humanities_tasks"
 "include": "_default_template_yaml"
 "task": "mmlu_high_school_european_history"
 "task_alias": "high_school_european_history"