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ppx_cd.ml
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open Base
open Ppxlib
open Ppx_arrayjit.Ppx_helper
open Ppx_shared
module A = Ppxlib_ast.Ast_helper
let ndarray_op ?axis_labels ?label expr =
let loc = expr.pexp_loc in
let values, batch_dims, output_dims, input_dims = ndarray_constant expr in
let edims dims = Ast_builder.Default.elist ~loc dims in
let op =
match (axis_labels, label) with
| None, None -> [%expr NTDSL.ndarray]
| Some axis_labels, None -> [%expr NTDSL.ndarray ~axis_labels:[%e axis_labels]]
| None, Some label -> [%expr NTDSL.ndarray ~label:[%e label]]
| Some axis_labels, Some label ->
[%expr NTDSL.ndarray ~axis_labels:[%e axis_labels] ~label:[%e label]]
in
[%expr
[%e op] ~batch_dims:[%e edims batch_dims] ~input_dims:[%e edims input_dims]
~output_dims:[%e edims output_dims] [%e values]]
type expr_type =
| Code
| Array
| Value_of_tensor of expression
| Grad_of_tensor of expression
| Tensor
| Unknown
| Merge_value of expression
| Merge_grad of expression
| No_grad_tensor_intro of { name : string; name_expr : expression }
let is_unknown = function Unknown -> true | _ -> false
type projections_slot = LHS | RHS1 | RHS2 | RHS3 | Nonslot | Undet [@@deriving equal, sexp]
type result = {
vbs : value_binding Map.M(String).t;
(** [vbs] are the bindings introduced by inline tensor declarations (aka. punning). These
bindings are discharged with the whole [%cd] extension scope in scope. *)
typ : expr_type;
slot : projections_slot;
expr : expression;
(** Depending on {!field-typ}, of type:
- if [Code]: [Assignments.comp];
- if [Array | Merge_value | Value_of_tensor]: [Tnode.t];
- if [Merge_grad | Grad_of_tensor]: [Tnode.t option];
- if [Tensor | Unknown | No_grad_tensor_intro]: [Tensor.t]. *)
array_opt_of_code : expression option;
(** Of type: [Tnode.t]. It keeps track of which tensor node to use when [typ] is [Code] but
the result is used in an array context. *)
}
type array_setup = {
vb : value_binding option;
(** This binding is only generated for a tensor expression that is not an identifier, since
recomputing the expression (when copied) would generate a fresh tensor. It is discharged
when an assignment is built. *)
slot : projections_slot;
filler_typ : expr_type;
fwd_code_or_noop : expression option; (** Of type: [Assignments.comp]. *)
array_opt : expression; (** Of type: if [slot = LHS] then [Tnode.t] else [Assignments.buffer]. *)
tensor : expression option; (** Of type: [Tensor.t]. *)
pun_hint_tnode : (expression * bool) option;
(** Of type: [string list]. The tnode, if any, whose label the relevant punned no-gradient
tensor should incorporate in its label. The bool denotes whether this is a preferred (high
quality) guess. *)
}
let make_vb ~loc ~name ~name_expr ~hint_label =
let pat = A.Pat.var ~loc { loc = name_expr.pexp_loc; txt = name } in
let v =
match hint_label with
| None -> [%expr NTDSL.term ~label:[ [%e name_expr] ] ()]
| Some hint_label -> [%expr NTDSL.term ~label:([%e name_expr] :: [%e hint_label]) ()]
in
let vb = A.Vb.mk ~loc pat v in
vb
let reduce_embs_arr ~loc (rs : array_setup list) =
List.filter_map rs ~f:(fun hs -> hs.fwd_code_or_noop)
|> List.reduce ~f:(fun embs comp -> [%expr Base.Set.union [%e embs] [%e comp].embedded_nodes])
(** The expression argument is of type: [Assignments.t]. *)
let assignment ~punned ~lhs ~rhses body =
let setups = lhs :: rhses in
let loc = body.pexp_loc in
let forward_args = List.filter_map setups ~f:(fun { fwd_code_or_noop; _ } -> fwd_code_or_noop) in
let vbs, body =
match lhs.filler_typ with
| No_grad_tensor_intro { name; name_expr } -> (
let good_hints, bad_hints =
List.partition_tf ~f:snd @@ List.filter_map rhses ~f:(fun sup -> sup.pun_hint_tnode)
in
let hint_data = Option.first_some (List.hd good_hints) (List.hd bad_hints) in
let hint_label = Option.map ~f:fst hint_data in
let vbs = Map.singleton (module String) name @@ make_vb ~loc ~name ~name_expr ~hint_label in
match hint_data with
| None -> (vbs, body)
| Some data -> (
match Hashtbl.add punned ~key:name ~data with
| `Ok -> (vbs, body)
| `Duplicate ->
( no_vbs,
Ast_builder.Default.pexp_extension ~loc
@@ Location.error_extensionf ~loc
"ppx_ocannl %%cd: duplicate inline declaration of no-gradient tensor %s" name
)))
| _ -> (no_vbs, body)
in
let body =
if Option.is_some lhs.vb then
Ast_builder.Default.pexp_extension ~loc
@@ Location.error_extensionf ~loc
"ppx_ocannl %%cd: the assigned-to position cannot be an expression building a new tensor"
else body
in
let tensor_vbs = List.filter_map rhses ~f:(fun rhs -> rhs.vb) in
let body =
[%expr { asgns = [%e body]; embedded_nodes = Base.Set.empty (module Arrayjit.Tnode) }]
in
let comps =
List.fold (body :: List.rev forward_args) ~init:[%expr []] ~f:(fun xs x ->
[%expr [%e x] :: [%e xs]])
in
let expr = [%expr Arrayjit.Assignments.sequence [%e comps]] in
let expr =
if List.is_empty tensor_vbs then expr else A.Exp.let_ ~loc Nonrecursive tensor_vbs expr
in
{ vbs; typ = Code; slot = Nonslot; expr; array_opt_of_code = Some lhs.array_opt }
let project_p_slot debug loc slot =
match slot with
| LHS -> [%expr p.project_lhs]
| RHS1 -> [%expr p.project_rhs.(0)]
| RHS2 -> [%expr p.project_rhs.(1)]
| RHS3 -> [%expr p.project_rhs.(2)]
| Nonslot ->
Ast_builder.Default.pexp_extension ~loc
@@ Location.error_extensionf ~loc
"ppx_ocannl %%cd: not a valid accumulation/assignment slot filler at %s" debug
| Undet ->
Ast_builder.Default.pexp_extension ~loc
@@ Location.error_extensionf ~loc
"ppx_ocannl %%cd: insufficient slot filler information at %s %s" debug
"(incorporate one of: v, v1, v2, g, g1, g2, lhs, rhs, rhs1, rhs2)"
let project_p_dims debug loc slot =
match slot with
| LHS -> [%expr p.lhs_dims]
| RHS1 -> [%expr p.rhs_dims.(0)]
| RHS2 -> [%expr p.rhs_dims.(1)]
| RHS3 -> [%expr p.rhs_dims.(2)]
| Nonslot ->
Ast_builder.Default.pexp_extension ~loc
@@ Location.error_extensionf ~loc
"ppx_ocannl %%cd: not a valid accumulation/assignment slot filler at %s" debug
| Undet ->
Ast_builder.Default.pexp_extension ~loc
@@ Location.error_extensionf ~loc
"ppx_ocannl %%cd: insufficient slot filler information at %s %s" debug
"(incorporate one of: v, v1, v2, g, g1, g2, lhs, rhs, rhs1, rhs2)"
let guess_pun_hint ~punned ~bad_pun_hints filler_typ filler =
let loc = filler.pexp_loc in
let hint = [%expr [%e filler].Arrayjit.Tnode.label] in
match (filler_typ, filler) with
| Code, _ -> None
| _, { pexp_desc = Pexp_ident { txt = Lident name; _ }; _ } when Set.mem bad_pun_hints name ->
None
| Array, _ -> Some (hint, false)
| (Tensor | Unknown), { pexp_desc = Pexp_ident { txt = Lident name; _ }; _ }
when Hashtbl.mem punned name ->
Hashtbl.find punned name
| (Tensor | Unknown), { pexp_desc = Pexp_ident _; _ } -> Some (hint, true)
| (Tensor | Unknown), _ -> Some (hint, false)
| ( ( Value_of_tensor { pexp_desc = Pexp_ident { txt = Lident name; _ }; _ }
| Grad_of_tensor { pexp_desc = Pexp_ident { txt = Lident name; _ }; _ }
| Merge_value { pexp_desc = Pexp_ident { txt = Lident name; _ }; _ }
| Merge_grad { pexp_desc = Pexp_ident { txt = Lident name; _ }; _ } ),
_ )
when Set.mem bad_pun_hints name ->
None
| ( ( Value_of_tensor { pexp_desc = Pexp_ident { txt = Lident name; _ }; _ }
| Grad_of_tensor { pexp_desc = Pexp_ident { txt = Lident name; _ }; _ }
| Merge_value { pexp_desc = Pexp_ident { txt = Lident name; _ }; _ }
| Merge_grad { pexp_desc = Pexp_ident { txt = Lident name; _ }; _ } ),
_ )
when Hashtbl.mem punned name ->
Hashtbl.find punned name
| (Value_of_tensor t | Grad_of_tensor t | Merge_value t | Merge_grad t), _ -> (
let hint = [%expr [%e t].Tensor.value.Arrayjit.Tnode.label] in
match t with { pexp_desc = Pexp_ident _; _ } -> Some (hint, true) | _ -> Some (hint, false))
| No_grad_tensor_intro { name; _ }, _ -> Hashtbl.find punned name
let empty_tns ~loc = [%expr Base.Set.empty (module Arrayjit.Tnode)]
let empty_comp ~loc =
[%expr { asgns = Arrayjit.Assignments.Noop; embedded_nodes = [%e empty_tns ~loc] }]
let setup_array ~punned ~bad_pun_hints ~is_lhs
{ typ = filler_typ; slot; expr = filler; vbs; array_opt_of_code } =
assert (Map.is_empty vbs);
let loc = filler.pexp_loc in
let opt_buffer tn =
if is_lhs then [%expr Some [%e tn]] else [%expr Some (Arrayjit.Assignments.Node [%e tn])]
in
let buffer opt_tn =
if is_lhs then opt_tn
else [%expr Option.map [%e opt_tn] ~f:(fun tn -> Arrayjit.Assignments.Node tn)]
in
let pun_hint_tnode = guess_pun_hint ~punned ~bad_pun_hints filler_typ filler in
let default_setup =
{
vb = None;
fwd_code_or_noop = None;
filler_typ;
slot;
array_opt = opt_buffer [%expr [%e filler].Tensor.value];
tensor = None;
pun_hint_tnode;
}
in
match filler_typ with
| No_grad_tensor_intro _ when not is_lhs ->
{
default_setup with
array_opt =
Ast_builder.Default.pexp_extension ~loc
@@ Location.error_extensionf ~loc
"ppx_ocannl %%cd: punning is only allowed in the assigned-to position";
}
| (Tensor | Unknown) when match filler with { pexp_desc = Pexp_ident _; _ } -> true | _ -> false
->
let t = filler in
let fwd_code_or_noop =
Some
[%expr
if Tensor.is_fwd_root [%e t] then (
Tensor.remove_fwd_root [%e t];
[%e t].Tensor.forward)
else [%e empty_comp ~loc]]
in
{ default_setup with fwd_code_or_noop; tensor = Some t }
| Value_of_tensor ({ pexp_desc = Pexp_ident _; _ } as t) ->
let fwd_code_or_noop =
Some
[%expr
if Tensor.is_fwd_root [%e t] then (
Tensor.remove_fwd_root [%e t];
[%e t].Tensor.forward)
else [%e empty_comp ~loc]]
in
{
default_setup with
fwd_code_or_noop;
array_opt = opt_buffer [%expr [%e t].Tensor.value];
tensor = Some t;
}
| Value_of_tensor t ->
{
default_setup with
array_opt =
Ast_builder.Default.pexp_extension ~loc
@@ Location.error_extensionf ~loc
"ppx_ocannl %%cd: the <tensor>.value notation is only supported when <tensor> is an \
identifier";
tensor = Some t;
}
| Tensor | Unknown ->
(* Need to bind the expression computing the tensor so we don't recompute it. *)
let v =
match slot with
| LHS -> [%pat? nondiff__lhs]
| RHS1 -> [%pat? nondiff__rhs1]
| RHS2 -> [%pat? nondiff__rhs2]
| RHS3 -> [%pat? nondiff__rhs3]
| Nonslot | Undet -> [%pat? nondiff__tensor]
in
let t = pat2expr v in
let vb = Some (A.Vb.mk ~loc v filler) in
let fwd_code_or_noop =
Some
[%expr
if Tensor.is_fwd_root [%e t] then (
Tensor.remove_fwd_root [%e t];
[%e t].Tensor.forward)
else [%e empty_comp ~loc]]
in
{
default_setup with
vb;
fwd_code_or_noop;
array_opt = opt_buffer [%expr [%e t].Tensor.value];
tensor = Some t;
}
| No_grad_tensor_intro _ ->
(* Inline tensors are guaranteed to be leaf tensors, so they don't have forward code, but they
are embedded. *)
let fwd_code_or_noop =
Some
[%expr
Arrayjit.Assignments.
{
asgns = Noop;
embedded_nodes = Base.Set.singleton (module Arrayjit.Tnode) [%e filler].Tensor.value;
}]
in
{ default_setup with fwd_code_or_noop; tensor = Some filler }
| Code when Option.is_none array_opt_of_code ->
{
default_setup with
fwd_code_or_noop = Some filler;
array_opt =
Ast_builder.Default.pexp_extension ~loc
@@ Location.error_extensionf ~loc
"ppx_ocannl %%cd: could not determine a lead array of provided code";
}
| Code ->
{
default_setup with
fwd_code_or_noop = Some filler;
array_opt = buffer (Option.value_exn array_opt_of_code);
}
| Array -> { default_setup with array_opt = opt_buffer filler }
| Grad_of_tensor ({ pexp_desc = Pexp_ident _; _ } as t) ->
{ default_setup with array_opt = buffer filler; tensor = Some t }
| Grad_of_tensor t ->
{
default_setup with
array_opt =
Ast_builder.Default.pexp_extension ~loc
@@ Location.error_extensionf ~loc
"ppx_ocannl %%cd: the <tensor>.grad notation is only supported when <tensor> is an \
identifier";
tensor = Some t;
}
| (Merge_value _ | Merge_grad _) when is_lhs ->
{
default_setup with
array_opt =
Ast_builder.Default.pexp_extension ~loc
@@ Location.error_extensionf ~loc "ppx_ocannl %%cd: merge buffers cannot be assigned to";
}
| Merge_value t ->
{ default_setup with array_opt = [%expr Some (Merge_buffer [%e filler])]; tensor = Some t }
| Merge_grad t ->
{
default_setup with
array_opt =
[%expr Option.map [%e filler] ~f:(fun tn -> Arrayjit.Assignments.Merge_buffer tn)];
tensor = Some t;
}
let args_for ~loc = function
| { filler_typ = Merge_grad _; tensor = Some t; _ } -> (t, [%expr true], [%expr true])
| { filler_typ = Grad_of_tensor _; tensor = Some t; _ } -> (t, [%expr true], [%expr false])
| { filler_typ = Merge_value _; tensor = Some t; _ } -> (t, [%expr false], [%expr true])
| { filler_typ = _; tensor = Some t; _ } -> (t, [%expr false], [%expr false])
| _ ->
( Ast_builder.Default.pexp_extension ~loc
@@ Location.error_extensionf ~loc
"ppx_ocannl %%cd: cannot use `~logic` (infer shapes) for arrays, use tensors or \
`.value` or `.grad` notation",
[%expr false],
[%expr false] )
let reduce_res_vbs rs = reduce_vbss @@ List.map rs ~f:(fun r -> r.vbs)
let translate (expr : expression) : result =
let punned = Hashtbl.create (module String) in
let rec transl ~bad_pun_hints ~proj_in_scope (expr : expression) : result =
let loc = expr.pexp_loc in
let default_result =
{ vbs = no_vbs; typ = Tensor; slot = Undet; expr; array_opt_of_code = None }
in
let loop = transl ~bad_pun_hints in
let assignment_op accu_op =
loc
|> Option.value_or_thunk (Hashtbl.find assignment_ops accu_op) ~default:(fun () _loc ->
( false,
Ast_builder.Default.pexp_extension ~loc
@@ Location.error_extensionf ~loc
"ppx_ocannl %%cd: expected an assignment operator, one of: %s %s"
"=+ (Add), =- (Sub), =* (Mul),=/ (Div), =** (ToPowOf), =?/ (Relu_gate), =?^ \
(Satur01_gate), =|| (Or), =&& (And), =@^ (Max), =^^ (Min), =: (Arg2),=:+, \
=:-,"
" =:*, =:/, =:**, =:?/, =:?^, =:||, =:&&, =:@^, =:^^ (same with initializing \
the tensor to the neutral value before the start of the calculation)" ))
in
let unary_op un_op =
loc
|> Option.value_or_thunk (Hashtbl.find unary_ops un_op) ~default:(fun () loc ->
( [%expr Shape.Pointwise_un],
Ast_builder.Default.pexp_extension ~loc
@@ Location.error_extensionf ~loc
"ppx_ocannl %%cd: expected an assignment operator, one of: %s"
"id, relu, sat01, exp, log, exp2, log2, sin, cos, sqrt, recip, recip_sqrt, \
neg, tanh" ))
in
let binary_op bin_op =
loc
|> Option.value_or_thunk (Hashtbl.find binary_ops bin_op) ~default:(fun () _loc ->
( [%expr Shape.Pointwise_bin],
Ast_builder.Default.pexp_extension ~loc
@@ Location.error_extensionf ~loc
"ppx_ocannl %%cd: expected a binary operator, one of: %s"
"+ (Add), - (Sub), * (Mul), / (Div), **(ToPowOf), -?/ (Relu_gate), -?^ \
(Satur01_gate), -/> (Arg2), < (Cmplt), = (Cmpeq), || (Or), && (And), % \
(Mod), @^(Max), ^^ (Min)" ))
in
let ternary_op tern_op =
loc
|> Option.value_or_thunk (Hashtbl.find ternary_ops tern_op) ~default:(fun () _loc ->
( [%expr Shape.Pointwise_tern],
Ast_builder.Default.pexp_extension ~loc
@@ Location.error_extensionf ~loc
"ppx_ocannl %%cd: expected a ternary operator, one of: where, fma" ))
in
(* FIXME: collapse these (code reuse) *)
let process_assign_ternop ~accu_op ~lhs ~tern_op ~rhs1 ~rhs2 ~rhs3 ?projections ~proj_in_scope
() =
let initialize_neutral, accu_op = assignment_op accu_op in
let setup_l =
setup_array ~punned ~bad_pun_hints ~is_lhs:true @@ loop ~proj_in_scope:true lhs
in
let _, tern_op = ternary_op tern_op in
let setup_r1 = setup_array ~punned ~bad_pun_hints ~is_lhs:false @@ loop ~proj_in_scope rhs1 in
let setup_r2 = setup_array ~punned ~bad_pun_hints ~is_lhs:false @@ loop ~proj_in_scope rhs2 in
let setup_r3 = setup_array ~punned ~bad_pun_hints ~is_lhs:false @@ loop ~proj_in_scope rhs3 in
let initialize_neutral = if initialize_neutral then [%expr true] else [%expr false] in
let projections =
match projections with
| Some prjs -> prjs
| None ->
let lhs_dims = project_p_dims "LHS" lhs.pexp_loc setup_l.slot in
let rhs1_dims = project_p_dims "RHS1" lhs.pexp_loc setup_r1.slot in
let rhs2_dims = project_p_dims "RHS2" lhs.pexp_loc setup_r2.slot in
let rhs3_dims = project_p_dims "RHS3" lhs.pexp_loc setup_r3.slot in
let project_lhs = project_p_slot "LHS" lhs.pexp_loc setup_l.slot in
let project_rhs1 = project_p_slot "RHS1" rhs1.pexp_loc setup_r1.slot in
let project_rhs2 = project_p_slot "RHS2" rhs2.pexp_loc setup_r2.slot in
let project_rhs3 = project_p_slot "RHS3" rhs3.pexp_loc setup_r3.slot in
[%expr
lazy
(let p = Lazy.force projections in
Arrayjit.Indexing.
{
product_space = p.product_space;
product_iterators = p.product_iterators;
lhs_dims = [%e lhs_dims];
rhs_dims = [| [%e rhs1_dims]; [%e rhs2_dims]; [%e rhs3_dims] |];
project_lhs = [%e project_lhs];
project_rhs = [| [%e project_rhs1]; [%e project_rhs2]; [%e project_rhs3] |];
debug_info =
{
p.debug_info with
trace =
( "ppx_cd " ^ [%e expr2string_or_empty accu_op] ^ " "
^ [%e expr2string_or_empty tern_op],
Arrayjit.Indexing.unique_debug_id () )
:: p.debug_info.trace;
};
})]
in
(* FIXME: might be better to treat missing [rhs1, rhs2, rhs3] as zeros or errors rather than
eliding the code. *)
let body =
[%expr
Option.value ~default:Arrayjit.Assignments.Noop
@@ Option.map3 [%e setup_r1.array_opt] [%e setup_r2.array_opt] [%e setup_r3.array_opt]
~f:(fun rhs1 rhs2 rhs3 ->
Arrayjit.Assignments.Accum_ternop
{
initialize_neutral = [%e initialize_neutral];
accum = [%e accu_op];
lhs = Option.value_exn [%e setup_l.array_opt];
op = [%e tern_op];
rhs1;
rhs2;
rhs3;
projections = [%e projections];
})]
in
assignment ~punned ~lhs:setup_l ~rhses:[ setup_r1; setup_r2; setup_r3 ] body
in
let process_assign_binop ~accu_op ~lhs ~bin_op ~rhs1 ~rhs2 ?projections ~proj_in_scope () =
let initialize_neutral, accu_op = assignment_op accu_op in
let setup_l =
setup_array ~punned ~bad_pun_hints ~is_lhs:true @@ loop ~proj_in_scope:true lhs
in
let _, bin_op = binary_op bin_op in
let setup_r1 = setup_array ~punned ~bad_pun_hints ~is_lhs:false @@ loop ~proj_in_scope rhs1 in
let setup_r2 = setup_array ~punned ~bad_pun_hints ~is_lhs:false @@ loop ~proj_in_scope rhs2 in
let initialize_neutral = if initialize_neutral then [%expr true] else [%expr false] in
let projections =
match projections with
| Some prjs -> prjs
| None ->
let lhs_dims = project_p_dims "LHS" lhs.pexp_loc setup_l.slot in
let rhs1_dims = project_p_dims "RHS1" lhs.pexp_loc setup_r1.slot in
let rhs2_dims = project_p_dims "RHS2" lhs.pexp_loc setup_r2.slot in
let project_lhs = project_p_slot "LHS" lhs.pexp_loc setup_l.slot in
let project_rhs1 = project_p_slot "RHS1" rhs1.pexp_loc setup_r1.slot in
let project_rhs2 = project_p_slot "RHS2" rhs2.pexp_loc setup_r2.slot in
[%expr
lazy
(let p = Lazy.force projections in
Arrayjit.Indexing.
{
product_space = p.product_space;
product_iterators = p.product_iterators;
lhs_dims = [%e lhs_dims];
rhs_dims = [| [%e rhs1_dims]; [%e rhs2_dims] |];
project_lhs = [%e project_lhs];
project_rhs = [| [%e project_rhs1]; [%e project_rhs2] |];
debug_info =
{
p.debug_info with
trace =
( "ppx_cd " ^ [%e expr2string_or_empty accu_op] ^ " "
^ [%e expr2string_or_empty bin_op],
Arrayjit.Indexing.unique_debug_id () )
:: p.debug_info.trace;
};
})]
in
(* TODO: might be better to treat missing [rhs1, rhs2] as zeros or errors rather than eliding
the code. *)
let body =
[%expr
Option.value ~default:Arrayjit.Assignments.Noop
@@ Option.map3 [%e setup_l.array_opt] [%e setup_r1.array_opt] [%e setup_r2.array_opt]
~f:(fun lhs rhs1 rhs2 ->
Arrayjit.Assignments.Accum_binop
{
initialize_neutral = [%e initialize_neutral];
accum = [%e accu_op];
lhs;
op = [%e bin_op];
rhs1;
rhs2;
projections = [%e projections];
})]
in
assignment ~punned ~lhs:setup_l ~rhses:[ setup_r1; setup_r2 ] body
in
let process_assign_unop ~accu_op ~lhs ~un_op ~rhs ?projections ~proj_in_scope () =
let initialize_neutral, accum = assignment_op accu_op in
let _, op = unary_op un_op in
(* FIXME: I think this ignores the slot information here! Just assuming [projections] is
as-should-be, but that's not consistent with omitting the projections arg (assuming it
comes from the context). *)
let setup_l = setup_array ~punned ~bad_pun_hints ~is_lhs:true @@ loop ~proj_in_scope lhs in
let setup_r = setup_array ~punned ~bad_pun_hints ~is_lhs:false @@ loop ~proj_in_scope rhs in
let initialize_neutral = if initialize_neutral then [%expr true] else [%expr false] in
let projections =
match projections with
| Some prjs -> prjs
| None ->
let lhs_dims = project_p_dims "LHS" lhs.pexp_loc setup_l.slot in
let rhs1_dims = project_p_dims "RHS1" lhs.pexp_loc setup_r.slot in
let project_lhs = project_p_slot "LHS" lhs.pexp_loc setup_l.slot in
let project_rhs1 = project_p_slot "RHS1" rhs.pexp_loc setup_r.slot in
[%expr
lazy
(let p = Lazy.force projections in
Arrayjit.Indexing.
{
product_space = p.product_space;
product_iterators = p.product_iterators;
lhs_dims = [%e lhs_dims];
rhs_dims = [| [%e rhs1_dims] |];
project_lhs = [%e project_lhs];
project_rhs = [| [%e project_rhs1] |];
debug_info =
{
p.debug_info with
trace =
( "ppx_cd " ^ [%e string_expr ~loc accu_op] ^ " "
^ [%e string_expr ~loc un_op],
Arrayjit.Indexing.unique_debug_id () )
:: p.debug_info.trace;
};
})]
in
(* TODO: might be better to treat missing [rhs] as zeros or errors rather than eliding the
code. *)
let body =
[%expr
Option.value ~default:Arrayjit.Assignments.Noop
@@ Option.map2 [%e setup_l.array_opt] [%e setup_r.array_opt] ~f:(fun lhs rhs ->
Arrayjit.Assignments.Accum_unop
{
initialize_neutral = [%e initialize_neutral];
accum = [%e accum];
lhs;
op = [%e op];
rhs;
projections = [%e projections];
})]
in
assignment ~punned ~lhs:setup_l ~rhses:[ setup_r ] body
in
let process_raw_ternop ~accu_op ~lhs ~tern_op ~rhs1 ~rhs2 ~rhs3 ~logic =
let initialize_neutral, accu_op = assignment_op accu_op in
let setup_l = setup_array ~punned ~bad_pun_hints ~is_lhs:true @@ loop ~proj_in_scope lhs in
let setup_r1 = setup_array ~punned ~bad_pun_hints ~is_lhs:false @@ loop ~proj_in_scope rhs1 in
let setup_r2 = setup_array ~punned ~bad_pun_hints ~is_lhs:false @@ loop ~proj_in_scope rhs2 in
let setup_r3 = setup_array ~punned ~bad_pun_hints ~is_lhs:false @@ loop ~proj_in_scope rhs3 in
let initialize_neutral = if initialize_neutral then [%expr true] else [%expr false] in
let t_expr, lhs_is_grad, _ = args_for ~loc setup_l in
let t1_expr, rhs1_is_grad, rhs1_is_merge = args_for ~loc setup_r1 in
let t2_expr, rhs2_is_grad, rhs2_is_merge = args_for ~loc setup_r2 in
let t3_expr, rhs3_is_grad, rhs3_is_merge = args_for ~loc setup_r3 in
let body =
[%expr
Tensor.raw_ternop ~initialize_neutral:[%e initialize_neutral] ~accum:[%e accu_op]
~t:[%e t_expr] ~lhs_is_grad:[%e lhs_is_grad] ~op:[%e tern_op] ~t1:[%e t1_expr]
~rhs1_is_grad:[%e rhs1_is_grad] ~rhs1_is_merge:[%e rhs1_is_merge] ~t2:[%e t2_expr]
~rhs2_is_grad:[%e rhs2_is_grad] ~rhs2_is_merge:[%e rhs2_is_merge] ~t3:[%e t3_expr]
~rhs3_is_grad:[%e rhs3_is_grad] ~rhs3_is_merge:[%e rhs3_is_merge] ~logic:[%e logic]]
in
assignment ~punned ~lhs:setup_l ~rhses:[ setup_r1; setup_r2; setup_r3 ] body
in
let process_raw_binop ~accu_op ~lhs ~bin_op ~rhs1 ~rhs2 ~logic =
let initialize_neutral, accu_op = assignment_op accu_op in
let setup_l = setup_array ~punned ~bad_pun_hints ~is_lhs:true @@ loop ~proj_in_scope lhs in
let setup_r1 = setup_array ~punned ~bad_pun_hints ~is_lhs:false @@ loop ~proj_in_scope rhs1 in
let setup_r2 = setup_array ~punned ~bad_pun_hints ~is_lhs:false @@ loop ~proj_in_scope rhs2 in
let initialize_neutral = if initialize_neutral then [%expr true] else [%expr false] in
let t_expr, lhs_is_grad, _ = args_for ~loc setup_l in
let t1_expr, rhs1_is_grad, rhs1_is_merge = args_for ~loc setup_r1 in
let t2_expr, rhs2_is_grad, rhs2_is_merge = args_for ~loc setup_r2 in
let body =
[%expr
Tensor.raw_binop ~initialize_neutral:[%e initialize_neutral] ~accum:[%e accu_op]
~t:[%e t_expr] ~lhs_is_grad:[%e lhs_is_grad] ~op:[%e bin_op] ~t1:[%e t1_expr]
~rhs1_is_grad:[%e rhs1_is_grad] ~rhs1_is_merge:[%e rhs1_is_merge] ~t2:[%e t2_expr]
~rhs2_is_grad:[%e rhs2_is_grad] ~rhs2_is_merge:[%e rhs2_is_merge] ~logic:[%e logic]]
in
assignment ~punned ~lhs:setup_l ~rhses:[ setup_r1; setup_r2 ] body
in
let process_raw_unop ~accu_op ~lhs ~un_op ~rhs ~logic =
let initialize_neutral, accu_op = assignment_op accu_op in
let setup_l = setup_array ~punned ~bad_pun_hints ~is_lhs:true @@ loop ~proj_in_scope lhs in
let setup_r = setup_array ~punned ~bad_pun_hints ~is_lhs:false @@ loop ~proj_in_scope rhs in
let initialize_neutral = if initialize_neutral then [%expr true] else [%expr false] in
let t_expr, lhs_is_grad, _ = args_for ~loc setup_l in
let t1_expr, rhs_is_grad, rhs_is_merge = args_for ~loc setup_r in
let body =
[%expr
Tensor.raw_unop ~initialize_neutral:[%e initialize_neutral] ~accum:[%e accu_op]
~t:[%e t_expr] ~lhs_is_grad:[%e lhs_is_grad] ~op:[%e un_op] ~t1:[%e t1_expr]
~rhs_is_grad:[%e rhs_is_grad] ~rhs_is_merge:[%e rhs_is_merge] ~logic:[%e logic]]
in
assignment ~punned ~lhs:setup_l ~rhses:[ setup_r ] body
in
match expr with
| { pexp_desc = Pexp_constant (Pconst_float _); _ } ->
{ default_result with expr = [%expr NTDSL.number [%e expr]] }
| { pexp_desc = Pexp_constant (Pconst_integer _); _ } ->
{ default_result with expr = [%expr NTDSL.number (Float.of_int [%e expr])] }
| [%expr
[%e? { pexp_desc = Pexp_constant (Pconst_char ch); pexp_loc; _ }]
[%e? { pexp_desc = Pexp_constant (Pconst_float _); _ } as f]] ->
let axis =
Ast_helper.Exp.constant ~loc:pexp_loc (Pconst_string (String.of_char ch, pexp_loc, None))
in
{ default_result with expr = [%expr NTDSL.number ~axis_label:[%e axis] [%e f]] }
| [%expr
[%e? { pexp_desc = Pexp_constant (Pconst_char ch); pexp_loc; _ }]
[%e? { pexp_desc = Pexp_constant (Pconst_integer _); _ } as i]] ->
let axis =
Ast_helper.Exp.constant ~loc:pexp_loc (Pconst_string (String.of_char ch, pexp_loc, None))
in
{
default_result with
expr = [%expr NTDSL.number ~axis_label:[%e axis] (Float.of_int [%e i])];
}
| { pexp_desc = Pexp_constant (Pconst_string (name, str_loc, _)); _ } ->
{
default_result with
typ = No_grad_tensor_intro { name; name_expr = expr };
expr = A.Exp.ident ~loc:str_loc { txt = Lident name; loc = str_loc };
}
| { pexp_desc = Pexp_array _; _ }
| { pexp_desc = Pexp_construct ({ txt = Lident "::"; _ }, _); _ } ->
{ default_result with expr = ndarray_op expr }
| { pexp_desc = Pexp_ident { txt = Lident ("v" | "lhs"); _ }; _ } ->
{ default_result with typ = Array; slot = LHS }
| { pexp_desc = Pexp_ident { txt = Lident "g"; _ }; _ } ->
{ default_result with typ = Array; slot = LHS }
| { pexp_desc = Pexp_ident { txt = Lident "rhs1"; _ }; _ } ->
{ default_result with typ = Array; slot = RHS1 }
| { pexp_desc = Pexp_ident { txt = Lident "t1"; _ }; _ } ->
{ default_result with slot = RHS1; expr }
| { pexp_desc = Pexp_ident { txt = Lident "v1"; _ }; _ } ->
{ default_result with typ = Array; slot = RHS1; expr = [%expr t1.Tensor.value] }
| { pexp_desc = Pexp_ident { txt = Lident "g1"; _ }; _ } ->
{
default_result with
typ = Grad_of_tensor [%expr t1];
slot = RHS1;
expr = [%expr Option.map t1.Tensor.diff ~f:(fun d -> d.Tensor.grad)];
}
| { pexp_desc = Pexp_ident { txt = Lident "rhs2"; _ }; _ } ->
{ default_result with typ = Array; slot = RHS2 }
| { pexp_desc = Pexp_ident { txt = Lident "t2"; _ }; _ } ->
{ default_result with typ = Tensor; slot = RHS2 }
| { pexp_desc = Pexp_ident { txt = Lident "v2"; _ }; _ } ->
{ default_result with typ = Array; slot = RHS2; expr = [%expr t2.Tensor.value] }
| { pexp_desc = Pexp_ident { txt = Lident "g2"; _ }; _ } ->
{
default_result with
typ = Grad_of_tensor [%expr t2];
slot = RHS2;
expr = [%expr Option.map t2.Tensor.diff ~f:(fun d -> d.Tensor.grad)];
}
| { pexp_desc = Pexp_ident { txt = Lident "rhs3"; _ }; _ } ->
{ default_result with typ = Array; slot = RHS3 }
| { pexp_desc = Pexp_ident { txt = Lident "t3"; _ }; _ } ->
{ default_result with typ = Tensor; slot = RHS3 }
| { pexp_desc = Pexp_ident { txt = Lident "v3"; _ }; _ } ->
{ default_result with typ = Array; slot = RHS3; expr = [%expr t3.Tensor.value] }
| { pexp_desc = Pexp_ident { txt = Lident "g3"; _ }; _ } ->
{
default_result with
typ = Grad_of_tensor [%expr t3];
slot = RHS3;
expr = [%expr Option.map t3.Tensor.diff ~f:(fun d -> d.Tensor.grad)];
}
| { pexp_desc = Pexp_ident { txt = Lident op_ident; _ }; _ } when is_primitive_op op_ident ->
default_result
| [%expr [%e? expr1] **. [%e? { pexp_desc = Pexp_constant (Pconst_integer _); _ } as i]] ->
(* FIXME: `**.` should take a tensor and require that it's a literal. *)
(* We need to hardcode these two patterns to prevent the numbers from being converted to tensors. *)
let res1 = loop ~proj_in_scope expr1 in
{
res1 with
typ = Tensor;
expr = [%expr NTDSL.O.( **. ) [%e res1.expr] (Float.of_int [%e i])];
}
| [%expr [%e? expr1] **. [%e? expr2]] ->
let res1 = loop ~proj_in_scope expr1 in
{ res1 with typ = Tensor; expr = [%expr NTDSL.O.( **. ) [%e res1.expr] [%e expr2]] }
| [%expr
[%e? expr1]
*+ [%e? { pexp_desc = Pexp_constant (Pconst_string (spec_str, _, _)); _ } as spec]
[%e? expr2]]
when String.contains spec_str '>' ->
let res1 = loop ~proj_in_scope expr1 in
let res2 = loop ~proj_in_scope expr2 in
let slot =
Option.value ~default:Undet
@@ List.find ~f:(function Undet -> false | _ -> true) [ res1.slot; res2.slot ]
in
{
vbs = reduce_vbss [ res1.vbs; res2.vbs ];
typ = Tensor;
slot;
expr = [%expr NTDSL.einsum [%e spec] [%e res1.expr] [%e res2.expr]];
array_opt_of_code = None;
}
| [%expr
[%e? expr1]
++ [%e? { pexp_desc = Pexp_constant (Pconst_string (spec_str, _, _)); _ } as spec]]
when String.contains spec_str '>' ->
let res1 = loop ~proj_in_scope expr1 in
{ res1 with typ = Tensor; expr = [%expr NTDSL.einsum1 [%e spec] [%e res1.expr]] }
| [%expr [%e? expr1].grad] -> (
let res1 = loop ~proj_in_scope expr1 in
match res1.typ with
| Unknown | Tensor | No_grad_tensor_intro _ ->
{
res1 with
typ = Grad_of_tensor expr1;
expr = [%expr Option.map [%e res1.expr].Tensor.diff ~f:(fun d -> d.Tensor.grad)];
(* It's never a good idea to embed backprop code outside of a proper backprop pass. *)
}
| Merge_value _ ->
{
res1 with
typ = Merge_grad expr1;
expr =
Ast_builder.Default.pexp_extension ~loc
@@ Location.error_extensionf ~loc
"ppx_ocannl %%cd: write .grad.merge instead of .merge.grad";
}
| Code | Array | Value_of_tensor _ | Grad_of_tensor _ | Merge_grad _ ->
{
res1 with
typ = Array;
expr =
Ast_builder.Default.pexp_extension ~loc
@@ Location.error_extensionf ~loc "ppx_ocannl %%cd: only tensors have a gradient";
})
| [%expr [%e? expr1].value] -> (
let res1 = loop ~proj_in_scope expr1 in
(* TODO: maybe this is too permissive? E.g. [t1.grad.value] is accepted. *)
match res1.typ with
| Unknown | Tensor | No_grad_tensor_intro _ ->
{
res1 with
typ = Value_of_tensor res1.expr;
expr = [%expr [%e res1.expr].Tensor.value];
}
| Code ->
{
default_result with
typ = Array;
slot = res1.slot;
expr =
Ast_builder.Default.pexp_extension ~loc
@@ Location.error_extensionf ~loc
"ppx_ocannl %%cd: <code>.value notation not supported when <code> is not a \
tensor";
}
| Array | Value_of_tensor _ | Grad_of_tensor _ | Merge_value _ | Merge_grad _ -> res1)
| [%expr [%e? expr1].merge] -> (
let res1 = loop ~proj_in_scope expr1 in
match res1.typ with
| Unknown | Tensor | No_grad_tensor_intro _ ->
{ res1 with typ = Merge_value res1.expr; expr = [%expr [%e res1.expr].Tensor.value] }
| Value_of_tensor t ->
{ res1 with typ = Merge_value t; expr = [%expr [%e res1.expr].Tensor.value] }
| Array | Code ->
{
res1 with
typ = Array;
expr =
Ast_builder.Default.pexp_extension ~loc
@@ Location.error_extensionf ~loc
"ppx_ocannl %%cd: only tensor nodes (e.g. `.value` or `.grad`) can be merged";
}
| Grad_of_tensor t -> { res1 with vbs = no_vbs; typ = Merge_grad t }
| Merge_value _ | Merge_grad _ ->
{
res1 with
expr =
Ast_builder.Default.pexp_extension ~loc
@@ Location.error_extensionf ~loc "ppx_ocannl %%cd: repeated .merge not allowed";
})
| [%expr
~~([%e? { pexp_desc = Pexp_constant (Pconst_string _); _ } as comment];
[%e? expr2])] ->
let res2 = loop ~proj_in_scope expr2 in
{
res2 with
expr =
[%expr
let __comment_block = [%e res2.expr] in
{
Arrayjit.Assignments.asgns =
Arrayjit.Assignments.Block_comment
([%e comment], __comment_block.Arrayjit.Assignments.asgns);
embedded_nodes = __comment_block.Arrayjit.Assignments.embedded_nodes;
}];
}
| [%expr
~~([%e? { pexp_desc = Pexp_apply (expr, exprs); pexp_loc; _ }];
[%e? expr2])] ->
let elements =
expr :: List.map ~f:snd exprs
|> List.map ~f:(function
| { pexp_desc = Pexp_constant (Pconst_string _); _ } as s -> s
| [%expr [%e? t].value] -> [%expr Arrayjit.Tnode.debug_name [%e t].value]
| [%expr [%e? t].grad] -> [%expr Arrayjit.Tnode.debug_name [%e t].value ^ ".grad"]
| t -> [%expr Arrayjit.Tnode.debug_name [%e t].value])
in
let res2 = loop ~proj_in_scope expr2 in
{
res2 with
expr =
[%expr
let __comment_block = [%e res2.expr] in
{
Arrayjit.Assignments.asgns =
Arrayjit.Assignments.Block_comment
( String.concat_array ~sep:" " [%e Ast_helper.Exp.array ~loc:pexp_loc elements],
__comment_block.Arrayjit.Assignments.asgns );
embedded_nodes = __comment_block.Arrayjit.Assignments.embedded_nodes;
}];
}
| [%expr
[%e? { pexp_desc = Pexp_ident { txt = Lident accu_op; _ }; _ }]
[%e? lhs]
([%e? { pexp_desc = Pexp_ident { txt = Lident bin_op; _ }; _ }]
([%e? rhs1], [%e? rhs2])
~projections:[%e? projections])]
| [%expr
[%e? { pexp_desc = Pexp_ident { txt = Lident accu_op; _ }; _ }]
[%e? lhs]
([%e? { pexp_desc = Pexp_ident { txt = Lident bin_op; _ }; _ }]
[%e? rhs1]
[%e? rhs2]
~projections:[%e? projections])]
| [%expr
[%e? { pexp_desc = Pexp_ident { txt = Lident accu_op; _ }; _ }]
[%e? lhs]
([%e? { pexp_desc = Pexp_ident { txt = Lident bin_op; _ }; _ }]
[%e? rhs1]
([%e? rhs2] ~projections:[%e? projections]))] ->
(* Note: when clause not needed here and below, it's an error if bin_op is not a primitive
binary op. *)
process_assign_binop ~accu_op ~lhs ~bin_op ~rhs1 ~rhs2 ~projections ~proj_in_scope:true ()
| [%expr
[%e? { pexp_desc = Pexp_ident { txt = Lident accu_op; _ }; _ }]
[%e? lhs]
([%e? { pexp_desc = Pexp_ident { txt = Lident tern_op; _ }; _ }]
([%e? rhs1], [%e? rhs2], [%e? rhs3])
~projections:[%e? projections])]
| [%expr
[%e? { pexp_desc = Pexp_ident { txt = Lident accu_op; _ }; _ }]
[%e? lhs]
([%e? { pexp_desc = Pexp_ident { txt = Lident tern_op; _ }; _ }]
[%e? rhs1]
[%e? rhs2]
[%e? rhs3]
~projections:[%e? projections])] ->
process_assign_ternop ~accu_op ~lhs ~tern_op ~rhs1 ~rhs2 ~rhs3 ~projections
~proj_in_scope:true ()
| [%expr
[%e? { pexp_desc = Pexp_ident { txt = Lident accu_op; _ }; _ }]
[%e? lhs]
([%e? { pexp_desc = Pexp_ident { txt = Lident un_op; _ }; _ }]
[%e? rhs]
~projections:[%e? projections])]
| [%expr
[%e? { pexp_desc = Pexp_ident { txt = Lident accu_op; _ }; _ }]
[%e? lhs]
(* FIXME: this was never needed as prefix operators bind tighter? *)
([%e? { pexp_desc = Pexp_ident { txt = Lident un_op; _ }; _ }]
([%e? rhs] ~projections:[%e? projections]))]
when Hashtbl.mem unary_ops un_op ->
process_assign_unop ~accu_op ~lhs ~un_op ~rhs ~projections ~proj_in_scope:true ()
| [%expr
[%e? { pexp_desc = Pexp_ident { txt = Lident accu_op; _ }; _ }]
[%e? lhs]
([%e? rhs] ~projections:[%e? projections])] ->
process_assign_unop ~accu_op ~lhs ~un_op:"id" ~rhs ~projections ~proj_in_scope:true ()
| [%expr
[%e? { pexp_desc = Pexp_ident { txt = Lident accu_op; _ }; _ }]
[%e? lhs]
([%e? { pexp_desc = Pexp_ident { txt = Lident bin_op; _ }; _ }]
([%e? rhs1], [%e? rhs2])
~logic:[%e? { pexp_desc = Pexp_constant (Pconst_string (spec, s_loc, _)); _ } as logic])]
| [%expr
[%e? { pexp_desc = Pexp_ident { txt = Lident accu_op; _ }; _ }]
[%e? lhs]
([%e? { pexp_desc = Pexp_ident { txt = Lident bin_op; _ }; _ }]
[%e? rhs1]
[%e? rhs2]
~logic:[%e? { pexp_desc = Pexp_constant (Pconst_string (spec, s_loc, _)); _ } as logic])]
| [%expr
[%e? { pexp_desc = Pexp_ident { txt = Lident accu_op; _ }; _ }]
[%e? lhs]
([%e? { pexp_desc = Pexp_ident { txt = Lident bin_op; _ }; _ }]
[%e? rhs1]
([%e? rhs2]
~logic:
[%e? { pexp_desc = Pexp_constant (Pconst_string (spec, s_loc, _)); _ } as logic]))]
->
let logic =
let loc = s_loc in
if String.equal spec "." then [%expr Shape.Pointwise_bin]
else if String.equal spec "@" then [%expr Shape.Compose]
else [%expr Shape.Einsum [%e logic]]
in
let _, bin_op = binary_op bin_op in
process_raw_binop ~accu_op ~lhs ~bin_op ~rhs1 ~rhs2 ~logic
| [%expr
[%e? { pexp_desc = Pexp_ident { txt = Lident accu_op; _ }; _ }]
[%e? lhs]
([%e? { pexp_desc = Pexp_ident { txt = Lident tern_op; _ }; _ }]
([%e? rhs1], [%e? rhs2], [%e? rhs3])
~logic:[%e? { pexp_desc = Pexp_constant (Pconst_string (spec, s_loc, _)); _ }])]
| [%expr
[%e? { pexp_desc = Pexp_ident { txt = Lident accu_op; _ }; _ }]
[%e? lhs]
([%e? { pexp_desc = Pexp_ident { txt = Lident tern_op; _ }; _ }]
[%e? rhs1]
[%e? rhs2]
[%e? rhs3]
~logic:[%e? { pexp_desc = Pexp_constant (Pconst_string (spec, s_loc, _)); _ }])] ->
let logic =
let loc = s_loc in
if String.equal spec "." then [%expr Shape.Pointwise_bin]
else if String.equal spec "@" then [%expr Shape.Compose]
else
Ast_builder.Default.pexp_extension ~loc
@@ Location.error_extensionf ~loc
"ppx_ocannl %%cd: expected <.> or <@>, found <%s> -- einsum notation for ternary \
operators not supported yet, see issue #305"
spec
in
let _, tern_op = ternary_op tern_op in
process_raw_ternop ~accu_op ~lhs ~tern_op ~rhs1 ~rhs2 ~rhs3 ~logic
| [%expr