Include recall computation

[johnarevalo]

@shntnu as per our discussion.

An starting point could be this function:

copairs/src/copairs/compute.py

Lines 89 to 96 in fc829c0

	def average_precision(rel_k) -> np.ndarray:
	"""Compute average precision based on binary list sorted by relevance"""
	tp = np.cumsum(rel_k, axis=1)
	num_pos = tp[:, -1]
	k = np.arange(1, rel_k.shape[1] + 1)
	pr_k = tp / k
	ap = (pr_k * rel_k).sum(axis=1) / num_pos
	return ap