code: def ravel_tril_indices(n, k=0, m=None):
      if m is None:
          size = (n, n)
      else:
          size = (n, m)
      idxs = _np.tril_indices(n, k, m)
      return _np.ravel_multi_index(idxs, size)
  
imports: from ._dispatch import BACKEND_NAME, _common
  from ._dispatch import numpy
label_desc: Use image node_id 23 for calling a global function with example usage: ravel_tril_indices(n, k, m) and returns: _np