code: def enumerate(semiring, scores):
      semiring = semiring
      batch, N, _, NT = scores.shape
  
      def enumerate(x, start, end):
          if start + 1 == end:
              yield (scores[:, start, start, x], [(start, x)])
          else:
              for w in range(start + 1, end):
                  for y in range(NT):
                      for z in range(NT):
                          for m1, y1 in enumerate(y, start, w):
                              for m2, z1 in enumerate(z, w, end):
                                  yield (
                                      semiring.times(
                                          m1,
                                          m2,
                                          scores[:, start, end - 1, x],
                                      ),
                                      [(x, start, w, end)] + y1 + z1,
                                  )
  
      ls = []
      for nt in range(NT):
          ls += [s for s, _ in enumerate(nt, 0, N)]
  
      return semiring.sum(torch.stack(ls, dim=-1)), None
  
imports: import torch_struct
  import torch
  from torch_struct import LogSemiring
  import itertools
  from hypothesis.strategies import integers, composite, floats
  from hypothesis.extra.numpy import arrays
  import numpy
label_desc: Use image node_id 2 for calling the CKY_CRFTest obj's underlying member method code with example usage: obj.enumerate(semiring, scores) and returns: semiring,  None