add arithmetic tasks

lm_eval/tasks/arithmetic/arithmetic_1dc.yaml

+group:
+  - arithmetic
+task: arithmetic_1dc
+dataset_path: EleutherAI/arithmetic
+dataset_name: arithmetic_1dc
+output_type: loglikelihood
+validation_split: validation
+test_split: null
+template_aliases: ""
+doc_to_text: "{{context}}"
+doc_to_target: "{{completion}}"
+metric_list:
+  - metric: acc
+    aggregation: mean
+    higher_is_better: true

lm_eval/tasks/arithmetic/arithmetic_2da.yaml

+group:
+  - arithmetic
+task: arithmetic_2da
+dataset_path: EleutherAI/arithmetic
+dataset_name: arithmetic_2da
+output_type: loglikelihood
+validation_split: validation
+test_split: null
+template_aliases: ""
+doc_to_text: "{{context}}"
+doc_to_target: "{{completion}}"
+metric_list:
+  - metric: acc
+    aggregation: mean
+    higher_is_better: true

lm_eval/tasks/arithmetic/arithmetic_2dm.yaml

+group:
+  - arithmetic
+task: arithmetic_2dm
+dataset_path: EleutherAI/arithmetic
+dataset_name: arithmetic_2dm
+output_type: loglikelihood
+validation_split: validation
+test_split: null
+template_aliases: ""
+doc_to_text: "{{context}}"
+doc_to_target: "{{completion}}"
+metric_list:
+  - metric: acc
+    aggregation: mean
+    higher_is_better: true

lm_eval/tasks/arithmetic/arithmetic_2ds.yaml

+group:
+  - arithmetic
+task: arithmetic_2ds
+dataset_path: EleutherAI/arithmetic
+dataset_name: arithmetic_2ds
+output_type: loglikelihood
+validation_split: validation
+test_split: null
+template_aliases: ""
+doc_to_text: "{{context}}"
+doc_to_target: "{{completion}}"
+metric_list:
+  - metric: acc
+    aggregation: mean
+    higher_is_better: true

lm_eval/tasks/arithmetic/arithmetic_3da.yaml

+group:
+  - arithmetic
+task: arithmetic_3da
+dataset_path: EleutherAI/arithmetic
+dataset_name: arithmetic_3da
+output_type: loglikelihood
+validation_split: validation
+test_split: null
+template_aliases: ""
+doc_to_text: "{{context}}"
+doc_to_target: "{{completion}}"
+metric_list:
+  - metric: acc
+    aggregation: mean
+    higher_is_better: true

lm_eval/tasks/arithmetic/arithmetic_3ds.yaml

+group:
+  - arithmetic
+task: arithmetic_3ds
+dataset_path: EleutherAI/arithmetic
+dataset_name: arithmetic_3ds
+output_type: loglikelihood
+validation_split: validation
+test_split: null
+template_aliases: ""
+doc_to_text: "{{context}}"
+doc_to_target: "{{completion}}"
+metric_list:
+  - metric: acc
+    aggregation: mean
+    higher_is_better: true

lm_eval/tasks/arithmetic/arithmetic_4da.yaml

+group:
+  - arithmetic
+task: arithmetic_4da
+dataset_path: EleutherAI/arithmetic
+dataset_name: arithmetic_4da
+output_type: loglikelihood
+validation_split: validation
+test_split: null
+template_aliases: ""
+doc_to_text: "{{context}}"
+doc_to_target: "{{completion}}"
+metric_list:
+  - metric: acc
+    aggregation: mean
+    higher_is_better: true

lm_eval/tasks/arithmetic/arithmetic_4ds.yaml

+group:
+  - arithmetic
+task: arithmetic_4ds
+dataset_path: EleutherAI/arithmetic
+dataset_name: arithmetic_4ds
+output_type: loglikelihood
+validation_split: validation
+test_split: null
+template_aliases: ""
+doc_to_text: "{{context}}"
+doc_to_target: "{{completion}}"
+metric_list:
+  - metric: acc
+    aggregation: mean
+    higher_is_better: true

lm_eval/tasks/arithmetic/arithmetic_5da.yaml

+group:
+  - arithmetic
+task: arithmetic_5da
+dataset_path: EleutherAI/arithmetic
+dataset_name: arithmetic_5da
+output_type: loglikelihood
+validation_split: validation
+test_split: null
+template_aliases: ""
+doc_to_text: "{{context}}"
+doc_to_target: "{{completion}}"
+metric_list:
+  - metric: acc
+    aggregation: mean
+    higher_is_better: true

lm_eval/tasks/arithmetic/arithmetic_5ds.yaml

+group:
+  - arithmetic
+task: arithmetic_5ds
+dataset_path: EleutherAI/arithmetic
+dataset_name: arithmetic_5ds
+output_type: loglikelihood
+validation_split: validation
+test_split: null
+template_aliases: ""
+doc_to_text: "{{context}}"
+doc_to_target: "{{completion}}"
+metric_list:
+  - metric: acc
+    aggregation: mean
+    higher_is_better: true