diary

* DIARY: Added a diary that might serve as a record of my thoughts.

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+This is a "diary" that records my thoughts when trying to debug the
+forest manipulations.  Basically the forests are wrongly "merged", and
+produce weird clones.
+
+Right now I have finished refactoring most of the codes, but still
+fail to perceive why the forests behave in that way.  I even finished
+a proto-type of my procedural macros which help me reduce
+boiler-plates but are not necessary.
+
+Right now I think I need more refined control over the details of the
+forests manipulations.  To be more precise, I need to be able to
+observe, step by step, how the chain-rule machine manipulated the
+forests.  This means in particular to be able to produce graphs of
+half-way forests whenever I want.  I have not yet figured out how to
+do this exactly.
+
+The rough plan is to compress all steps of graphs into an "incremental
+format" that stores not just forests information, but how they were
+created, and allow the users to re-create the forests step by step.
+
+Simply put, this is just another feature that I would like to have for
+the end-users, but postponed to later since that was not essential for
+my developments.  Now this seems to be quite important for me to
+properly observe the forests, so it is perhaps time to implement this
+feature first.