test case for graph caching
not ready, work on it later
pickling a graph has a problem
Fix pickling of FunctionGraph
opt caching pkl optmized graph problem
Fix max recursion problem.
Fix test.
pep8
remove debug statement.
Add comment
Fix some pickling issues
Fix more pickling of FunctionGraph
is_same_graph complains about Exception: inputs is already owned by another fgraph
Removed ipdb import
Using temporary pickle to debug. Refactored lambda expressions used in history. Refactored problematic Opt.
File are now opening in binary mode.
Hacked "owned by same graph" bug.
Updated current progress on same fgraph debug.
Reversed useless refactoring.
Solved "givens" related problem.