remove old cb macro

src/training.jl

@@ -1,30 +1,6 @@
 using Juno: info
 using .Batches: tobatch
 
-"""
-  @cb for ... end t expr
-
-Run the for loop, executing `expr` every `t` seconds.
-"""
-macro cb(ex, t, f)
-  @assert isexpr(ex, :for)
-  cond, body = ex.args
-  @esc t f cond body
-  :(let
-    t0 = time_ns()
-    dt = $t*1e9
-    @progress $(Expr(:for, cond, quote
-      t = time_ns()
-      if t - t0 > dt
-        t0 = t
-        f = () -> $f
-        f()
-      end
-      $body
-    end))
-  end)
-end
-
 """
 Returns a function that when invoked, will only be triggered at most once
 during `timeout` seconds. Normally, the throttled function will run