src/nupic/math/logarithms.py
def nsum0(lx):
  """
  Accepts log-values as input, exponentiates them, sums down the rows
  (first dimension), normalizes and returns the result.
  Handles underflow by rescaling so that the largest values is exactly 1.0.
  """
  lx = numpy.asarray(lx)
  base = lx.max()
  x = numpy.exp(lx - base)
  ssum = x.sum(0)
  result = ssum / ssum.sum()

  conventional = (numpy.exp(lx).sum(0) / numpy.exp(lx).sum())
  assert similar(result, conventional)

  return result
def nsum0(lx):
  """
  Accepts log-values as input, exponentiates them, sums down the rows
  (first dimension), normalizes and returns the result.
  Handles underflow by rescaling so that the largest values is exactly 1.0.
  """
  lx = numpy.asarray(lx)
  base = lx.max()
  x = numpy.exp(lx - base)
  ssum = x.sum(0)
  result = ssum / ssum.sum()

  conventional = (numpy.exp(lx).sum(0) / numpy.exp(lx).sum())
  assert similar(result, conventional)

  return result
def nsum0 ( lx ) : lx = numpy . asarray ( lx ) base = lx . max ( ) x = numpy . exp ( lx - base ) ssum = x . sum ( 0 ) result = ssum / ssum . sum ( ) conventional = ( numpy . exp ( lx ) . sum ( 0 ) / numpy . exp ( lx ) . sum ( ) ) assert similar ( result , conventional ) return result
Accepts log-values as input, exponentiates them, sums down the rows
  (first dimension), normalizes and returns the result.
  Handles underflow by rescaling so that the largest values is exactly 1.0.
Accepts log - values as input exponentiates them sums down the rows ( first dimension ) normalizes and returns the result . Handles underflow by rescaling so that the largest values is exactly 1 . 0 .