code: def euclidean(x, y):
      r"""Standard euclidean distance.
  
      .. math::
          D(x, y) = \\sqrt{\sum_i (x_i - y_i)^2}
      """
      result = 0.0
      for i in range(x.shape[0]):
          result += (x[i] - y[i]) ** 2
      return np.sqrt(result)
  
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 1 for calling a global function with example usage: euclidean(x, y) and returns: np