code: def compute_num_samples(patch_size):
      """Compute the number of samples as the dot product of the elements.
  
      Parameters
      ----------
      patch_size : ndarray
          Patch size.
  
      Returns
      -------
      int
          Number of samples.
      """
  
      return np.prod(patch_size)
  
file_path: dipy/dipy/denoise/localpca.py
imports: import copy
  from packaging.version import Version
  from warnings import warn
  import numpy
  import scipy
  from scipy.linalg import eigh
  from dipy.denoise.pca_noise_estimate import pca_noise_estimate
label_desc: Use image node_id 5 for calling a global function with example usage: compute_num_samples(patch_size) and returns: np