Factor_graph (stanc.Analysis_and_optimization.Factor

type factor =

| TargetTerm of Middle.Expr.Typed.t
| Reject
| LPFunction of Core.string * Middle.Expr.Typed.t Core.list

val factor_of_sexp : Sexplib0.Sexp.t -> factor

val sexp_of_factor : factor -> Sexplib0.Sexp.t

type factor_graph = {

factor_map : (factor * Dataflow_types.label, Dataflow_types.vexpr Core.Set.Poly.t) Core.Map.Poly.t;
var_map : (Dataflow_types.vexpr, (factor * Dataflow_types.label) Core.Set.Poly.t) Core.Map.Poly.t;

}

val sexp_of_factor_graph : factor_graph -> Sexplib0.Sexp.t

val extract_factors_statement : 
  (Middle.Expr.Typed.t, 'a) Middle.Stmt.Pattern.t ->
  factor Core.List.t

val extract_factors : 
  ('a, (Middle.Expr.Typed.t, 'a) Middle.Stmt.Pattern.t * 'b) Core.Map.Poly.t ->
  'a ->
  ('a * factor) Core.List.t

val factor_rhs : factor -> Dataflow_types.vexpr Core.Set.Poly.t

val factor_var_dependencies : 
  (Dataflow_types.label,
    (Middle.Expr.Typed.t, Dataflow_types.label) Middle.Stmt.Pattern.t
    * Dependence_analysis.node_dep_info)
    Core.Map.Poly.t ->
  Dataflow_types.vexpr Core.Set.Poly.t ->
  (Dataflow_types.label * factor) ->
  (Dataflow_types.vexpr, Base__.Comparator.Poly.comparator_witness) Core.Set.t

val build_adjacency_maps : 
  (Dataflow_types.label * factor * Dataflow_types.vexpr Core.Set.Poly.t)
    Core.List.t ->
  factor_graph

Helper function to generate the factor graph adjacency map representation from a factor-adjacency list

val fg_remove_fac : 
  factor_graph ->
  (factor * Dataflow_types.cf_state) ->
  factor_graph

val fg_remove_var : factor_graph -> Dataflow_types.vexpr -> factor_graph

val remove_touching : 
  Dataflow_types.vexpr Core.Set.Poly.t ->
  factor_graph ->
  factor_graph

val prog_factor_graph : 
  ?exclude_data_facs:??? ->
  Middle.Program.Typed.t ->
  factor_graph

Build a factor graph from prog.log_prob using dependency analysis

val fg_reaches : 
  Dataflow_types.vexpr Core.Set.Poly.t ->
  Dataflow_types.vexpr Core.Set.Poly.t ->
  factor_graph ->
  Core.bool

BFS on 'fg' with initial frontier 'starts' and terminating at any element of 'goals'

val fg_factor_reaches : 
  (factor * Dataflow_types.label) ->
  Dataflow_types.vexpr Core.Set.Poly.t ->
  factor_graph ->
  Core.bool

val fg_factor_is_prior : 
  Dataflow_types.vexpr ->
  (factor * Dataflow_types.label) ->
  Dataflow_types.vexpr Core.Set.Poly.t ->
  factor_graph ->
  Core.bool

val fg_var_priors : 
  Dataflow_types.vexpr ->
  Dataflow_types.vexpr Core.Set.Poly.t ->
  factor_graph ->
  (factor * Dataflow_types.label) Core.Set.Poly.t Core.option

Priors of V are neighbors of V which have no connection to any data except though V So for graph G and each parameter V: G' = G\V; For each neighbor F: Use BFS starting from F in G' and search for any data, if there is none, F is a prior

val list_priors : 
  ?factor_graph:??? ->
  Middle.Program.Typed.t ->
  (Dataflow_types.vexpr,
    (factor * Dataflow_types.label) Core.Set.Poly.t Core.option
    * Middle.Location_span.t)
    Core.Map.Poly.t

val string_of_factor : factor -> Core.string

val string_of_vexpr : Dataflow_types.vexpr -> Core.string

val factor_graph_to_dot : factor_graph -> Core.string

Utility to print a factor graph to the Graphviz dot language for visualization