code: def log10(self, floor=None):
          
  
          def f(dataset, s, floor):
              arr = dataset[s]
              arr = np.log10(arr)
              if floor is not None:
                  arr[arr < floor] = floor
              dataset[s] = arr
  
          self.chunkwise(f, floor=floor)
docs: Take the log base 10 of the entire dataset.
  
          Parameters
          ----------
          floor : number (optional)
              Clip values below floor after log. Default is None.