class_docstr: Create a tempo histogram with autocorrelation.
  
  Parameters
  ----------
  min_bpm : float, optional
      Minimum tempo to detect [bpm].
  max_bpm : float, optional
      Maximum tempo to detect [bpm].
  hist_buffer : float
      Aggregate the tempo histogram over `hist_buffer` seconds.
  fps : float, optional
      Frames per second.
  online : bool, optional
      Operate in online (i.e. causal) mode.
class_docstr_tok: ["Create","a","tempo","histogram","with","autocorrelation",".","Parameters","--","--","--","--","--","min_bpm",":","float",",","optional","Minimum","tempo","to","detect","[","bpm","]",".","max_bpm",":","float",",","optional","Maximum","tempo","to","detect","[","bpm","]",".","hist_buffer",":","float","Aggregate","the","tempo","histogram","over","`","hist_buffer","`","seconds",".","fps",":","float",",","optional","Frames","per","second",".","online",":","bool",",","optional","Operate","in","online","(","i.e",".","causal",")","mode","."]
docstr: Reset to initial state.
code: def reset(self):
      """Reset to initial state."""
      super(ACFTempoHistogramProcessor, self).reset()
      self._act_buffer.reset()
  
imports: from __future__ import absolute_import, division, print_function
  import sys
  import warnings
  from operator import itemgetter
  import numpy
  from ..audio.signal import smooth
  from ..processors import BufferProcessor, OnlineProcessor
label_desc: Use image node_id 2 for calling the ACFTempoHistogramProcessor obj's underlying member method code with example usage: obj.reset() without return types