code: def getValueAt(self, dateTime):
      return self.__getValueAtImpl(dt.datetime_to_timestamp(dateTime))
  
imports: from pyalgotrade import technical
  from pyalgotrade.utils import collections
  from pyalgotrade.utils import dt
  import numpy
  from scipy import stats
label_desc: Use image node_id 4 for calling the LeastSquaresRegressionWindow obj's underlying member method code with example usage: obj.getValueAt(dateTime) and returns: self