code: def _get_num_int(lf, dt=0.02, t=50):
      # numerical integral of numerical function
      tt = np.arange(dt, t + dt, dt)
      return lf(tt).sum() * dt
  
file_path: nipy/nipy/modalities/fmri/hrf.py
imports: from functools import partial
  import numpy
  import scipy.stats
  import sympy
  from sympy.utilities.lambdify import implemented_function
  from .utils import T, lambdify_t
label_desc: Use image node_id 4 for calling a global function with example usage: _get_num_int(lf, dt, t) and returns: unknown