update all mmlu variants to include group_config

lm_eval/tasks/mmlu/flan_cot_fewshot/_mmlu.yaml

@@ -4,3 +4,6 @@ task:
   - mmlu_flan_cot_fewshot_other
   - mmlu_flan_cot_fewshot_social_sciences
   - mmlu_flan_cot_fewshot_humanities
+group_config:
+  aggregate_metric: True
+  weight_by_size: True
\ No newline at end of file

lm_eval/tasks/mmlu/flan_cot_zeroshot/_mmlu.yaml

@@ -4,3 +4,6 @@ task:
   - mmlu_flan_cot_zeroshot_other
   - mmlu_flan_cot_zeroshot_social_sciences
   - mmlu_flan_cot_zeroshot_humanities
+group_config:
+  aggregate_metric: True
+  weight_by_size: True
\ No newline at end of file

lm_eval/tasks/mmlu/flan_n_shot/generative/_mmlu.yaml

@@ -4,3 +4,6 @@ task:
   - mmlu_flan_n_shot_generative_other
   - mmlu_flan_n_shot_generative_social_sciences
   - mmlu_flan_n_shot_generative_humanities
+group_config:
+  aggregate_metric: True
+  weight_by_size: True
\ No newline at end of file

lm_eval/tasks/mmlu/flan_n_shot/loglikelihood/_mmlu.yaml

@@ -4,3 +4,6 @@ task:
   - mmlu_flan_n_shot_loglikelihood_other
   - mmlu_flan_n_shot_loglikelihood_social_sciences
   - mmlu_flan_n_shot_loglikelihood_humanities
+group_config:
+  aggregate_metric: True
+  weight_by_size: True
\ No newline at end of file