add lambada

lm_eval/tasks/lambada/README.md

 # LAMBADA
 
 ### Paper
-The LAMBADA dataset: Word prediction requiring a broad discourse context
-https://arxiv.org/pdf/1606.06031.pdf
+Title: `The LAMBADA dataset: Word prediction requiring a broad discourse context`
+
+Abstract: https://arxiv.org/pdf/1606.06031.pdf
 
 LAMBADA is a dataset to evaluate the capabilities of computational models for text
 understanding by means of a word prediction task. LAMBADA is a collection of narrative
@@ -14,6 +15,18 @@ in the broader discourse.
 
 Homepage: https://zenodo.org/record/2630551#.X4Xzn5NKjUI
 
+### Groups and Tasks
+
+#### Groups
+
+- `lambada`
+
+#### Tasks
+
+- `lambada_openai`
+- `lambada_standard`
+
+
 ### Citation
 
 @misc{

lm_eval/tasks/lambada/lambada_openai.yaml

 group:
   - lambada
-  - loglikelihood
-  - perplexity
 task: lambada_openai
 dataset_path: EleutherAI/lambada_openai
 dataset_name: default

lm_eval/tasks/lambada/lambada_standard.yaml

 group:
   - lambada
-  - loglikelihood
-  - perplexity
 task: lambada_standard
 dataset_path: lambada
 dataset_name: null