/[MITgcm]/manual/s_autodiff/text/doc_ad_2.tex
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revision 1.17 by edhill, Sat Oct 16 03:40:17 2004 UTC revision 1.19 by heimbach, Tue Aug 2 22:26:58 2005 UTC
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1  % $Header$  % $Header$
2  % $Name$  % $Name$
3    
4    Author: Patrick Heimbach
5    
6  {\sf Automatic differentiation} (AD), also referred to as algorithmic  {\sf Automatic differentiation} (AD), also referred to as algorithmic
7  (or, more loosely, computational) differentiation, involves  (or, more loosely, computational) differentiation, involves
8  automatically deriving code to calculate  automatically deriving code to calculate
# Line 691  differentiation using the software tool Line 693  differentiation using the software tool
693  \input{part5/doc_ad_the_model}  \input{part5/doc_ad_the_model}
694    
695  The basic flow is depicted in \ref{fig:adthemodel}.  The basic flow is depicted in \ref{fig:adthemodel}.
696  If CPP option {\tt ALLOW\_AUTODIFF\_TAMC} is defined, the driver routine  If CPP option \texttt{ALLOW\_AUTODIFF\_TAMC} is defined,
697    the driver routine
698  {\it the\_model\_main}, instead of calling {\it the\_main\_loop},  {\it the\_model\_main}, instead of calling {\it the\_main\_loop},
699  invokes the adjoint of this routine, {\it adthe\_main\_loop},  invokes the adjoint of this routine, {\it adthe\_main\_loop}
700  which is the toplevel routine in terms of automatic differentiation.  (case \texttt{\#define ALLOW\_ADJOINT\_RUN}), or
701  The routine {\it adthe\_main\_loop} has been generated by TAF.  the tangent linear of this routine {\it g\_the\_main\_loop}
702    (case \texttt{\#define ALLOW\_TANGENTLINEAR\_RUN}),
703    which are the toplevel routines in terms of automatic differentiation.
704    The routines {\it adthe\_main\_loop} or {\it g\_the\_main\_loop}
705    are generated by TAF.
706  It contains both the forward integration of the full model, the  It contains both the forward integration of the full model, the
707  cost function calculation,  cost function calculation,
708  any additional storing that is required for efficient checkpointing,  any additional storing that is required for efficient checkpointing,
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