title: How to use tensoflow make such a Calculation
body: <p>two tensor 
  x = [a,b,c]
  y = [d,e,f]
  both float32 numbers
  I want to get a tensor like this z = [ad,ae,af,bd,be,bf,cd,ce,cf]
  this is jsut a simple example
  the real tensor may be huge</p>