code: def true_angular_from_alt_cosine(d):
      return 1.0 - (np.arccos(pow(2.0, -d)) / np.pi)
  
imports: import numpy
  import numba
  from pynndescent.optimal_transport import allocate_graph_structures, initialize_graph_structures, initialize_supply, initialize_cost, network_simplex_core, total_cost, ProblemStatus, sinkhorn_transport_plan
label_desc: Use image node_id 31 for calling a global function with example usage: true_angular_from_alt_cosine(d) and returns: unknown