add conditional import ; fix task names

lm_eval/tasks/tinyBenchmarks/agg_functions.py

 from typing import List
 
 import numpy as np
-import tinyBenchmarks as tb
+
+
+try:
+    import tinyBenchmarks as tb
+except ModuleNotFoundError:
+    raise ModuleNotFoundError(
+        "`tinyBenchmarks` is required for tinyBenchmarks task metric calculation, install via \
+`pip install git+https://github.com/felipemaiapolo/tinyBenchmarks`"
+    )
 
 
 def agg_pirt(items: List[float], benchmark: str) -> float:

lm_eval/tasks/tinyBenchmarks/tinyArc.yaml

-group:
-  - tinyBenchmarks
 task: tinyArc
 dataset_path: tinyBenchmarks/tinyAI2_arc
 dataset_name: ARC-Challenge

lm_eval/tasks/tinyBenchmarks/tinyGSM8k.yaml

-group:
-  - math_word_problems
-  - tinyBenchmarks
 task: tinyGSM8k
 dataset_path: tinyBenchmarks/tinyGSM8k
 dataset_name: main

lm_eval/tasks/tinyBenchmarks/tinyHellaswag.yaml

-group:
-  - tinyBenchmarks
 task: tinyHellaswag
 dataset_path: tinyBenchmarks/tinyHellaswag
 dataset_name: null

lm_eval/tasks/tinyBenchmarks/tinyTruthfulQA_mc1.yaml

-group:
-  - truthfulqa
-task: truthfulqa_mc1
+task: tinyTruthfulQA_mc1
 dataset_path: tinyBenchmarks/tinyTruthfulQA
 dataset_name: multiple_choice
 output_type: multiple_choice