code: def _normalize_index(i: int, dim_size: int) -> int:
      if i < 0:
          return dim_size + i
      else:
          return i
  
imports: import torch
  from linear_operator import LinearOperator, to_linear_operator
  from linear_operator.operators import BlockDiagLinearOperator, BlockInterleavedLinearOperator, CatLinearOperator, DiagLinearOperator
  from .multivariate_normal import MultivariateNormal
label_desc: Use image node_id 1 for calling a global function with example usage: _normalize_index(i, dim_size) and returns: unknown, i