[EVAL] Long Horizon Execution

[akshathmangudi]

Approach described within #1056.

Tasks:

• Initial scaffolding of /tasks/tasks/long_horizon_execution.py
• Implement a custom scorer to parse <answer> tags.
• Complete implementation of /tasks/tasks/long_horizon_execution.py
• Evaluation and Testing

STATUS: ready for review.

Current behavior:

When we run lighteval tasks inspect long_horizon_execution, the output has been shown below:

... more lines
           "'basic', 'alive', 'cream', 'dress', 'black', 'brown', 'drama', "
           "'black', 'audio', 'brown', 'album', 'cover', 'avoid', 'aware', "
           "'event', 'dream', 'clean', 'clock', 'apple', 'above', 'close', "
           "'begin', 'allow', 'album', 'draft', 'brain', 'civil', 'faith', "
           "'death', 'coach', 'below', 'doubt', 'aware', 'cover', 'final', "
           "'allow', 'avoid', 'ahead', 'cross', 'child', 'cream', 'error', "
           "'break', 'brief', 'clock', 'final', 'dance', 'award', 'every', "
           "'chief', 'could', 'dream', 'begin', 'burst', 'audio', 'album', "
           "'cross', 'doubt', 'blood', 'child', 'brand', 'brand', 'extra', "
           "'broad', 'cloud', 'check', 'after', 'chart', 'basic', 'child', "
           "'coach', 'chair', 'faith', 'earth', 'audio', 'basic', 'field', "
           "'cloud', 'draft', 'apply', 'court', 'black', 'ahead', 'burst', "
           "'crowd', 'depth', 'enemy', 'drink', 'first', 'could', 'false', "
           "'could', 'blame', 'first', 'album', 'crowd', 'first', 'broad', "
           "'extra', 'clock', 'chart', 'fiber', 'board', 'earth', 'being', "
           "'alive', 'chart', 'avoid', 'dress', 'cloud', 'clean', 'avoid', "
           "'crash', 'clean', 'arise', 'death', 'brand', 'error']\n"
           '\n'
           'Your task: Calculate the cumulative sum after each key. The first '
           'sum is just the value of the first key. The second sum is the '
           'first value plus the second value, and so on.\n'
           '\n'
           'IMPORTANT:\n'
           '- Output your answer as a single line with comma-separated values '
           'inside <answer></answer> tags\n'
           '- Do not include any other text outside the answer tags\n'
           '- Format: <answer>value1,value2,value3,...</answer>\n'
           '- Example: If the cumulative sums are [5, 8, 12], output: '
           '<answer>5,8,12</answer>\n'
           '\n'
           'Your answer:',
  'sampling_methods': [],
  'specific': None,
  'stop_sequences': (),
  'task_name': 'long_horizon_execution',
  'unconditioned_query': None,
  'use_logits': False}

[akshathmangudi]

@NathanHB would love your review on this!

[akshathmangudi]

closing due to accidentally making my code changes from my fork's main branch.