code: def decode(b, dtype):
      """Decode a numpy array encoded as Base64."""
      return np.frombuffer(base64.b64decode(b.encode("utf-8")), dtype)
  
file_path: nilearn/nilearn/plotting/js_plotting_utils.py
imports: import base64
  import os
  import warnings
  from string import Template
  import matplotlib
  import matplotlib.pyplot
  import numpy
  from nilearn.plotting.html_document import HTMLDocument, set_max_img_views_before_warning
  from ..None import surface
  from .._utils.extmath import fast_abs_percentile
  from .._utils.param_validation import check_threshold
label_desc: Use image node_id 5 for calling a global function with example usage: decode(b, dtype) and returns: np