code: def dense(*elements):
          
          if len(elements) == 1 and not isinstance(elements[0], (float, int, long)):
              # it's list, numpy.array or other iterable object.
              elements = elements[0]
          return DenseVector(elements)
docs: Create a dense vector of 64-bit floats from a Python list or numbers.
  
          >>> Vectors.dense([1, 2, 3])
          DenseVector([1.0, 2.0, 3.0])
          >>> Vectors.dense(1.0, 2.0)
          DenseVector([1.0, 2.0])