code: def triangular_solve(x, y, upper=False, transpose=False):
      if y.size(-1) == 1:
          return x / y
      if transpose:
          y = y.transpose(-1, -2)
          upper = not upper
      return torch.linalg.solve_triangular(y, x, upper=upper)
  
imports: import math
  import torch
  from torch.fft import irfft, rfft
  from ..None import settings
label_desc: Use image node_id 19 for calling a global function with example usage: triangular_solve(x, y, upper, transpose) and returns: torch, unknown