package saga
Text processing and NLP extensions for Nx
Install
dune-project
Dependency
Authors
Maintainers
Sources
raven-1.0.0.alpha1.tbz
sha256=8e277ed56615d388bc69c4333e43d1acd112b5f2d5d352e2453aef223ff59867
sha512=369eda6df6b84b08f92c8957954d107058fb8d3d8374082e074b56f3a139351b3ae6e3a99f2d4a4a2930dd950fd609593467e502368a13ad6217b571382da28c
doc/src/saga.tokenizers/processors.ml.html
Source file processors.ml
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(** Post-processing module for tokenization output. *) type encoding = { ids : int array; type_ids : int array; tokens : string array; offsets : (int * int) array; special_tokens_mask : int array; attention_mask : int array; overflowing : encoding list; sequence_ranges : (int * int * int) list; } (** Type representing an encoding to be processed *) (** Main post-processor type *) type t = | Bert of { sep : string * int; cls : string * int } | Roberta of { sep : string * int; cls : string * int; pad : string * int; trim_offsets : bool; add_prefix_space : bool; } | ByteLevel of { trim_offsets : bool } | Template of { single : string; pair : string option; special_tokens : (string * int) list; } | Sequence of t list (** Helper functions *) let create_empty_encoding () = { ids = [||]; type_ids = [||]; tokens = [||]; offsets = [||]; special_tokens_mask = [||]; attention_mask = [||]; overflowing = []; sequence_ranges = []; } let add_token encoding token_str token_id type_id is_special = { encoding with ids = Array.append encoding.ids [| token_id |]; tokens = Array.append encoding.tokens [| token_str |]; type_ids = Array.append encoding.type_ids [| type_id |]; special_tokens_mask = Array.append encoding.special_tokens_mask [| (if is_special then 1 else 0) |]; attention_mask = Array.append encoding.attention_mask [| 1 |]; offsets = Array.append encoding.offsets [| (0, 0) |]; } (** Process BERT encoding *) let process_bert ~sep ~cls encodings ~add_special_tokens = if not add_special_tokens then encodings else let cls_str, cls_id = cls in let sep_str, sep_id = sep in match encodings with | [] -> [] | [ encoding ] -> (* Single sequence: [CLS] seq [SEP] *) let result = create_empty_encoding () in let result = add_token result cls_str cls_id 0 true in let result = { result with ids = Array.append result.ids encoding.ids; tokens = Array.append result.tokens encoding.tokens; type_ids = Array.append result.type_ids (Array.make (Array.length encoding.ids) 0); special_tokens_mask = Array.append result.special_tokens_mask (Array.make (Array.length encoding.ids) 0); attention_mask = Array.append result.attention_mask (Array.make (Array.length encoding.ids) 1); offsets = Array.append result.offsets encoding.offsets; } in let result = add_token result sep_str sep_id 0 true in [ result ] | [ enc1; enc2 ] -> (* Pair of sequences: [CLS] seq1 [SEP] seq2 [SEP] *) let result = create_empty_encoding () in let result = add_token result cls_str cls_id 0 true in (* Add first sequence *) let result = { result with ids = Array.append result.ids enc1.ids; tokens = Array.append result.tokens enc1.tokens; type_ids = Array.append result.type_ids (Array.make (Array.length enc1.ids) 0); special_tokens_mask = Array.append result.special_tokens_mask (Array.make (Array.length enc1.ids) 0); attention_mask = Array.append result.attention_mask (Array.make (Array.length enc1.ids) 1); offsets = Array.append result.offsets enc1.offsets; } in let result = add_token result sep_str sep_id 0 true in (* Add second sequence *) let result = { result with ids = Array.append result.ids enc2.ids; tokens = Array.append result.tokens enc2.tokens; type_ids = Array.append result.type_ids (Array.make (Array.length enc2.ids) 1); special_tokens_mask = Array.append result.special_tokens_mask (Array.make (Array.length enc2.ids) 0); attention_mask = Array.append result.attention_mask (Array.make (Array.length enc2.ids) 1); offsets = Array.append result.offsets enc2.offsets; } in let result = add_token result sep_str sep_id 1 true in [ result ] | _ -> encodings (* More than 2 sequences not supported *) (** Process RoBERTa encoding *) let process_roberta ~sep ~cls ~pad:_ ~trim_offsets:_ ~add_prefix_space:_ encodings ~add_special_tokens = if not add_special_tokens then encodings else (* RoBERTa uses: <s> seq </s> for single, <s> seq1 </s></s> seq2 </s> for pairs *) let cls_str, cls_id = cls in let sep_str, sep_id = sep in match encodings with | [] -> [] | [ encoding ] -> (* Single sequence: <s> seq </s> *) let result = create_empty_encoding () in let result = add_token result cls_str cls_id 0 true in let result = { result with ids = Array.append result.ids encoding.ids; tokens = Array.append result.tokens encoding.tokens; type_ids = Array.append result.type_ids (Array.make (Array.length encoding.ids) 0); special_tokens_mask = Array.append result.special_tokens_mask (Array.make (Array.length encoding.ids) 0); attention_mask = Array.append result.attention_mask (Array.make (Array.length encoding.ids) 1); offsets = Array.append result.offsets encoding.offsets; } in let result = add_token result sep_str sep_id 0 true in [ result ] | [ enc1; enc2 ] -> (* Pair: <s> seq1 </s></s> seq2 </s> *) let result = create_empty_encoding () in let result = add_token result cls_str cls_id 0 true in (* Add first sequence *) let result = { result with ids = Array.append result.ids enc1.ids; tokens = Array.append result.tokens enc1.tokens; type_ids = Array.append result.type_ids (Array.make (Array.length enc1.ids) 0); special_tokens_mask = Array.append result.special_tokens_mask (Array.make (Array.length enc1.ids) 0); attention_mask = Array.append result.attention_mask (Array.make (Array.length enc1.ids) 1); offsets = Array.append result.offsets enc1.offsets; } in let result = add_token result sep_str sep_id 0 true in let result = add_token result sep_str sep_id 0 true in (* Add second sequence *) let result = { result with ids = Array.append result.ids enc2.ids; tokens = Array.append result.tokens enc2.tokens; type_ids = Array.append result.type_ids (Array.make (Array.length enc2.ids) 0); special_tokens_mask = Array.append result.special_tokens_mask (Array.make (Array.length enc2.ids) 0); attention_mask = Array.append result.attention_mask (Array.make (Array.length enc2.ids) 1); offsets = Array.append result.offsets enc2.offsets; } in let result = add_token result sep_str sep_id 0 true in [ result ] | _ -> encodings (** Process byte-level encoding *) let process_byte_level ~trim_offsets encodings ~add_special_tokens:_ = if not trim_offsets then encodings else (* Trim whitespace from offsets *) List.map (fun encoding -> { encoding with offsets = Array.map (fun (start, stop) -> (* TODO: Implement proper offset trimming *) (start, stop)) encoding.offsets; }) encodings (** Process template encoding *) let process_template ~single ~pair:_ ~special_tokens:_ encodings ~add_special_tokens = if not add_special_tokens then encodings else (* TODO: Implement template processing *) let _ = single in encodings (** Main process function *) let rec process processor encodings ~add_special_tokens = match processor with | Bert { sep; cls } -> process_bert ~sep ~cls encodings ~add_special_tokens | Roberta { sep; cls; pad; trim_offsets; add_prefix_space } -> process_roberta ~sep ~cls ~pad ~trim_offsets ~add_prefix_space encodings ~add_special_tokens | ByteLevel { trim_offsets } -> process_byte_level ~trim_offsets encodings ~add_special_tokens | Template { single; pair; special_tokens } -> process_template ~single ~pair ~special_tokens encodings ~add_special_tokens | Sequence processors -> List.fold_left (fun encs proc -> process proc encs ~add_special_tokens) encodings processors (** Get number of added tokens *) let rec added_tokens processor ~is_pair = match processor with | Bert _ -> if is_pair then 3 else 2 (* [CLS] ... [SEP] or [CLS] ... [SEP] ... [SEP] *) | Roberta _ -> if is_pair then 4 else 2 (* <s> ... </s> or <s> ... </s></s> ... </s> *) | ByteLevel _ -> 0 | Template _ -> 0 (* TODO: Calculate from template *) | Sequence processors -> List.fold_left (fun acc proc -> acc + added_tokens proc ~is_pair) 0 processors (** Constructors *) let bert ~sep ~cls () = Bert { sep; cls } let roberta ~sep ~cls ?(trim_offsets = true) ?(add_prefix_space = true) () = let pad = ("<pad>", 1) in (* Default pad token *) Roberta { sep; cls; pad; trim_offsets; add_prefix_space } let byte_level ?(trim_offsets = true) () = ByteLevel { trim_offsets } let template ~single ?pair ?(special_tokens = []) () = Template { single; pair; special_tokens } let sequence processors = Sequence processors (** Serialization *) let rec to_json = function | Bert { sep = sep_str, sep_id; cls = cls_str, cls_id } -> `Assoc [ ("type", `String "BertProcessing"); ("sep", `List [ `String sep_str; `Int sep_id ]); ("cls", `List [ `String cls_str; `Int cls_id ]); ] | Roberta { sep = sep_str, sep_id; cls = cls_str, cls_id; pad = pad_str, pad_id; trim_offsets; add_prefix_space; } -> `Assoc [ ("type", `String "RobertaProcessing"); ("sep", `List [ `String sep_str; `Int sep_id ]); ("cls", `List [ `String cls_str; `Int cls_id ]); ("pad", `List [ `String pad_str; `Int pad_id ]); ("trim_offsets", `Bool trim_offsets); ("add_prefix_space", `Bool add_prefix_space); ] | ByteLevel { trim_offsets } -> `Assoc [ ("type", `String "ByteLevel"); ("trim_offsets", `Bool trim_offsets) ] | Template { single; pair; special_tokens } -> `Assoc [ ("type", `String "TemplateProcessing"); ("single", `String single); ("pair", match pair with None -> `Null | Some p -> `String p); ( "special_tokens", `List (List.map (fun (s, i) -> `List [ `String s; `Int i ]) special_tokens) ); ] | Sequence processors -> `Assoc [ ("type", `String "Sequence"); ("processors", `List (List.map to_json processors)); ] let rec of_json = function | `Assoc fields -> ( match List.assoc_opt "type" fields with | Some (`String "BertProcessing") -> let sep = match List.assoc_opt "sep" fields with | Some (`List [ `String s; `Int i ]) -> (s, i) | _ -> ("[SEP]", 102) in let cls = match List.assoc_opt "cls" fields with | Some (`List [ `String s; `Int i ]) -> (s, i) | _ -> ("[CLS]", 101) in Bert { sep; cls } | Some (`String "RobertaProcessing") -> let sep = match List.assoc_opt "sep" fields with | Some (`List [ `String s; `Int i ]) -> (s, i) | _ -> ("</s>", 2) in let cls = match List.assoc_opt "cls" fields with | Some (`List [ `String s; `Int i ]) -> (s, i) | _ -> ("<s>", 0) in let pad = match List.assoc_opt "pad" fields with | Some (`List [ `String s; `Int i ]) -> (s, i) | _ -> ("<pad>", 1) in let trim_offsets = match List.assoc_opt "trim_offsets" fields with | Some (`Bool b) -> b | _ -> true in let add_prefix_space = match List.assoc_opt "add_prefix_space" fields with | Some (`Bool b) -> b | _ -> true in Roberta { sep; cls; pad; trim_offsets; add_prefix_space } | Some (`String "ByteLevel") -> let trim_offsets = match List.assoc_opt "trim_offsets" fields with | Some (`Bool b) -> b | _ -> true in ByteLevel { trim_offsets } | Some (`String "TemplateProcessing") -> let single = match List.assoc_opt "single" fields with | Some (`String s) -> s | _ -> failwith "Missing single template" in let pair = match List.assoc_opt "pair" fields with | Some (`String p) -> Some p | _ -> None in let special_tokens = match List.assoc_opt "special_tokens" fields with | Some (`List tokens) -> List.map (function | `List [ `String s; `Int i ] -> (s, i) | _ -> failwith "Invalid special token format") tokens | _ -> [] in Template { single; pair; special_tokens } | Some (`String "Sequence") -> ( match List.assoc_opt "processors" fields with | Some (`List procs) -> Sequence (List.map of_json procs) | _ -> failwith "Invalid Sequence processor") | _ -> failwith "Unknown processor type") | _ -> failwith "Invalid processor JSON"
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