moving AbstractContext and evaluate!! to AbstractPPL (#56)

PavanChaggar · yebai · PavanChaggar · commit 8b1d184698fa · 2022-02-27T17:39:45.000Z
Addressing #55 and moving the definitions of `AbstractContext` and `evaluate!!` to AbstractPPL. Co-authored-by: Hong Ge <yebai@users.noreply.github.com>
diff --git a/src/AbstractPPL.jl b/src/AbstractPPL.jl
@@ -5,7 +5,7 @@ export VarName, getsym, getlens, inspace, subsumes, varname, vsym, @varname, @vs
 
 
 # Abstract model functions
-export AbstractProbabilisticProgram, condition, decondition, logdensityof, densityof
+export AbstractProbabilisticProgram, condition, decondition, logdensityof, densityof, AbstractContext, evaluate!!
 
 # Abstract traces
 export AbstractModelTrace
diff --git a/src/evaluate.jl b/src/evaluate.jl
@@ -0,0 +1,13 @@
+""" 
+    AbstractContext
+
+Common base type for evaluation contexts.
+"""
+abstract type AbstractContext end
+
+""" 
+evaluate!!
+
+General API for model operations, e.g. prior evaluation, log density, log joint etc.
+"""
+function evaluate!! end
