diff options
author | Olivier Chafik <ochafik@users.noreply.github.com> | 2024-04-12 19:43:38 +0100 |
---|---|---|
committer | GitHub <noreply@github.com> | 2024-04-12 19:43:38 +0100 |
commit | ab9a3240a9da941fdef5cd4a25f2b97c2f5a67aa (patch) | |
tree | aa2efe58bc95a650827db07c83eb8bc0e026162c /examples/server | |
parent | fbbc030ba93561fac842af994c5c6c4c1147f13b (diff) |
JSON schema conversion: ⚡️ faster repetitions, min/maxLength for strings, cap number length (#6555)
* json: rename python schema converter to make import easier
* server: skip null json_schema / grammar fields
* json: deps management for primitive rules (+ allow null values)
* json: optimize repetitions for minItems/maxItems and regexps: `a{,3}` goes from `"a"? "a"? "a"?` (explosive combos) to `(a (a (a)?)?)?`
* grammars: add troubleshooting section to readme
* json: cap length of numbers to 15 digits before/after decimal point
(avoids infinite gen, e.g. "one third" -> `0.333333333333...`)
* json: unify all repetition code (w/ or w/o sep)
* json: support string minLength/maxLength
* server+json: update server/README w/ result_format
* nits
* json: fix type error w/ python 3.8
* json: fix server/README (json_schema in /completion vs. result_format in /v1/chat/completions)
* json: simplify DOT `{"type": "string", "pattern": "^.$"}`
* json: remove recursion in opt_repetitions (avoids Python stack overflow)
* json: rm dead code
* json: rm useless assert & ggml.h import
Diffstat (limited to 'examples/server')
-rw-r--r-- | examples/server/README.md | 5 | ||||
-rw-r--r-- | examples/server/json-schema-to-grammar.mjs.hpp | 3322 | ||||
-rw-r--r-- | examples/server/public/json-schema-to-grammar.mjs | 200 | ||||
-rw-r--r-- | examples/server/server.cpp | 2 |
4 files changed, 1886 insertions, 1643 deletions
diff --git a/examples/server/README.md b/examples/server/README.md index a6fc92ea..918ac129 100644 --- a/examples/server/README.md +++ b/examples/server/README.md @@ -11,6 +11,7 @@ Set of LLM REST APIs and a simple web front end to interact with llama.cpp. * Continuous batching * Multimodal (wip) * Monitoring endpoints + * Schema-constrained JSON response format The project is under active development, and we are [looking for feedback and contributors](https://github.com/ggerganov/llama.cpp/issues/4216). @@ -250,6 +251,8 @@ node index.js `grammar`: Set grammar for grammar-based sampling. Default: no grammar + `json_schema`: Set a JSON schema for grammar-based sampling (e.g. `{"items": {"type": "string"}, "minItems": 10, "maxItems": 100}` of a list of strings, or `{}` for any JSON). See [tests](../../tests/test-json-schema-to-grammar.cpp) for supported features. Default: no JSON schema. + `seed`: Set the random number generator (RNG) seed. Default: `-1`, which is a random seed. `ignore_eos`: Ignore end of stream token and continue generating. Default: `false` @@ -365,6 +368,8 @@ Notice that each `probs` is an array of length `n_probs`. See [OpenAI Chat Completions API documentation](https://platform.openai.com/docs/api-reference/chat). While some OpenAI-specific features such as function calling aren't supported, llama.cpp `/completion`-specific features such as `mirostat` are supported. + The `response_format` parameter supports both plain JSON output (e.g. `{"type": "json_object"}`) and schema-constrained JSON (e.g. `{"type": "json_object", "schema": {"type": "string", "minLength": 10, "maxLength": 100}}`), similar to other OpenAI-inspired API providers. + *Examples:* You can use either Python `openai` library with appropriate checkpoints: diff --git a/examples/server/json-schema-to-grammar.mjs.hpp b/examples/server/json-schema-to-grammar.mjs.hpp index ef1d5dcf..da5035bf 100644 --- a/examples/server/json-schema-to-grammar.mjs.hpp +++ b/examples/server/json-schema-to-grammar.mjs.hpp @@ -2,1643 +2,1825 @@ unsigned char json_schema_to_grammar_mjs[] = { 0x2f, 0x2f, 0x20, 0x57, 0x41, 0x52, 0x4e, 0x49, 0x4e, 0x47, 0x3a, 0x20, 0x54, 0x68, 0x69, 0x73, 0x20, 0x66, 0x69, 0x6c, 0x65, 0x20, 0x77, 0x61, 0x73, 0x20, 0x70, 0x6f, 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+unsigned int json_schema_to_grammar_mjs_len = 21866; diff --git a/examples/server/public/json-schema-to-grammar.mjs b/examples/server/public/json-schema-to-grammar.mjs index 17bd60fd..8e0be1b4 100644 --- a/examples/server/public/json-schema-to-grammar.mjs +++ b/examples/server/public/json-schema-to-grammar.mjs @@ -1,33 +1,95 @@ -// WARNING: This file was ported from json-schema-to-grammar.py, please fix bugs / add features there first. +// WARNING: This file was ported from json_schema_to_grammar.py, please fix bugs / add features there first. const SPACE_RULE = '" "?'; +function _buildRepetition(itemRule, minItems, maxItems, opts={}) { + const separatorRule = opts.separatorRule ?? ''; + const itemRuleIsLiteral = opts.itemRuleIsLiteral ?? false + + if (separatorRule === '') { + if (minItems === 0 && maxItems === 1) { + return `${itemRule}?`; + } else if (minItems === 1 && maxItems === undefined) { + return `${itemRule}+`; + } + } + + let result = ''; + if (minItems > 0) { + if (itemRuleIsLiteral && separatorRule === '') { + result = `"${itemRule.slice(1, -1).repeat(minItems)}"`; + } else { + result = Array.from({ length: minItems }, () => itemRule) + .join(separatorRule !== '' ? ` ${separatorRule} ` : ' '); + } + } + + const optRepetitions = (upToN, prefixWithSep=false) => { + const content = separatorRule !== '' && prefixWithSep ? `${separatorRule} ${itemRule}` : itemRule; + if (upToN === 0) { + return ''; + } else if (upToN === 1) { + return `(${content})?`; + } else if (separatorRule !== '' && !prefixWithSep) { + return `(${content} ${optRepetitions(upToN - 1, true)})?`; + } else { + return Array.from({ length: upToN }, () => `(${content}`).join(' ').trim() + Array.from({ length: upToN }, () => ')?').join(''); + } + }; + + if (minItems > 0 && maxItems !== minItems) { + result += ' '; + } + + if (maxItems !== undefined) { + result += optRepetitions(maxItems - minItems, minItems > 0); + } else { + const itemOperator = `(${separatorRule !== '' ? separatorRule + ' ' : ''}${itemRule})`; + + if (minItems === 0 && separatorRule !== '') { + result = `(${itemRule} ${itemOperator}*)?`; + } else { + result += `${itemOperator}*`; + } + } + + return result; +} + +class BuiltinRule { + constructor(content, deps) { + this.content = content; + this.deps = deps || []; + } +} + +const UP_TO_15_DIGITS = _buildRepetition('[0-9]', 0, 15); + const PRIMITIVE_RULES = { - boolean: '("true" | "false") space', - number: '("-"? ([0-9] | [1-9] [0-9]*)) ("." [0-9]+)? ([eE] [-+]? [0-9]+)? space', - integer: '("-"? ([0-9] | [1-9] [0-9]*)) space', - value: 'object | array | string | number | boolean', - object: '"{" space ( string ":" space value ("," space string ":" space value)* )? "}" space', - array: '"[" space ( value ("," space value)* )? "]" space', - uuid: '"\\"" ' + [8, 4, 4, 4, 12].map(n => [...new Array(n)].map(_ => '[0-9a-fA-F]').join('')).join(' "-" ') + ' "\\"" space', - string: ` "\\"" ( - [^"\\\\] | - "\\\\" (["\\\\/bfnrt] | "u" [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F]) - )* "\\"" space`, - null: '"null" space', + boolean : new BuiltinRule('("true" | "false") space', []), + 'decimal-part' : new BuiltinRule('[0-9] ' + UP_TO_15_DIGITS, []), + 'integral-part': new BuiltinRule('[0-9] | [1-9] ' + UP_TO_15_DIGITS, []), + number : new BuiltinRule('("-"? integral-part) ("." decimal-part)? ([eE] [-+]? integral-part)? space', ['integral-part', 'decimal-part']), + integer : new BuiltinRule('("-"? integral-part) space', ['integral-part']), + value : new BuiltinRule('object | array | string | number | boolean | null', ['object', 'array', 'string', 'number', 'boolean', 'null']), + object : new BuiltinRule('"{" space ( string ":" space value ("," space string ":" space value)* )? "}" space', ['string', 'value']), + array : new BuiltinRule('"[" space ( value ("," space value)* )? "]" space', ['value']), + uuid : new BuiltinRule('"\\"" ' + [8, 4, 4, 4, 12].map(n => [...new Array(n)].map(_ => '[0-9a-fA-F]').join('')).join(' "-" ') + ' "\\"" space', []), + char : new BuiltinRule(`[^"\\\\] | "\\\\" (["\\\\/bfnrt] | "u" [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F])`, []), + string : new BuiltinRule(`"\\"" char* "\\"" space`, ['char']), + null : new BuiltinRule('"null" space', []), }; -const OBJECT_RULE_NAMES = ['object', 'array', 'string', 'number', 'boolean', 'null', 'value']; // TODO: support "uri", "email" string formats -const DATE_RULES = { - 'date' : '[0-9] [0-9] [0-9] [0-9] "-" ( "0" [1-9] | "1" [0-2] ) "-" ( \"0\" [1-9] | [1-2] [0-9] | "3" [0-1] )', - 'time' : '([01] [0-9] | "2" [0-3]) ":" [0-5] [0-9] ":" [0-5] [0-9] ( "." [0-9] [0-9] [0-9] )? ( "Z" | ( "+" | "-" ) ( [01] [0-9] | "2" [0-3] ) ":" [0-5] [0-9] )', - 'date-time': 'date "T" time', - 'date-string': '"\\"" date "\\"" space', - 'time-string': '"\\"" time "\\"" space', - 'date-time-string': '"\\"" date-time "\\"" space', -}; +const STRING_FORMAT_RULES = { + 'date' : new BuiltinRule('[0-9] [0-9] [0-9] [0-9] "-" ( "0" [1-9] | "1" [0-2] ) "-" ( \"0\" [1-9] | [1-2] [0-9] | "3" [0-1] )', []), + 'time' : new BuiltinRule('([01] [0-9] | "2" [0-3]) ":" [0-5] [0-9] ":" [0-5] [0-9] ( "." [0-9] [0-9] [0-9] )? ( "Z" | ( "+" | "-" ) ( [01] [0-9] | "2" [0-3] ) ":" [0-5] [0-9] )', []), + 'date-time' : new BuiltinRule('date "T" time', ['date', 'time']), + 'date-string' : new BuiltinRule('"\\"" date "\\"" space', ['date']), + 'time-string' : new BuiltinRule('"\\"" time "\\"" space', ['time']), + 'date-time-string': new BuiltinRule('"\\"" date-time "\\"" space', ['date-time']), +} -const RESERVED_NAMES = {'root': true, ...PRIMITIVE_RULES, ...DATE_RULES}; +const RESERVED_NAMES = {'root': true, ...PRIMITIVE_RULES, ...STRING_FORMAT_RULES}; const INVALID_RULE_CHARS_RE = /[^\dA-Za-z-]+/g; const GRAMMAR_LITERAL_ESCAPE_RE = /[\n\r"]/g; @@ -158,7 +220,7 @@ export class SchemaConverter { rule = '[\\U00000000-\\U0010FFFF]'; } else { // Accept any character... except \n and \r line break chars (\x0A and \xOD) - rule = '[\\U00000000-\\x09\\x0B\\x0C\\x0E-\\U0010FFFF]'; + rule = '[^\\x0A\\x0D]'; } return this._addRule('dot', rule); }; @@ -259,26 +321,19 @@ export class SchemaConverter { let [sub, subIsLiteral] = seq[seq.length - 1]; - if (minTimes === 0 && maxTimes === Infinity) { - seq[seq.length - 1] = [`${sub}*`, false]; - } else if (minTimes === 0 && maxTimes === 1) { - seq[seq.length - 1] = [`${sub}?`, false]; - } else if (minTimes === 1 && maxTimes === Infinity) { - seq[seq.length - 1] = [`${sub}+`, false]; - } else { - if (!subIsLiteral) { - let id = subRuleIds[sub]; - if (id === undefined) { - id = this._addRule(`${name}-${Object.keys(subRuleIds).length + 1}`, sub); - subRuleIds[sub] = id; - } - sub = id; + if (!subIsLiteral) { + let id = subRuleIds[sub]; + if (id === undefined) { + id = this._addRule(`${name}-${Object.keys(subRuleIds).length + 1}`, sub); + subRuleIds[sub] = id; } - - const repeatedSub = Array.from({ length: minTimes }, () => subIsLiteral ? `"${sub.slice(1, -1).repeat(minTimes)}"` : sub); - const optionalSub = maxTimes !== undefined ? Array.from({ length: maxTimes - minTimes }, () => `${sub}?`) : [`${sub}*`]; - seq[seq.length - 1] = [repeatedSub.concat(optionalSub).join(' '), false]; + sub = id; } + + seq[seq.length - 1] = [ + _buildRepetition(subIsLiteral ? `"${sub}"` : sub, minTimes, maxTimes, {itemRuleIsLiteral: subIsLiteral}), + false + ]; } else { let literal = ''; while (i < length) { @@ -394,47 +449,48 @@ export class SchemaConverter { ); } else { const itemRuleName = this.visit(items, `${name ?? ''}${name ? '-' : ''}item`); - const listItemOperator = `( "," space ${itemRuleName} )`; - let successiveItems = ''; - let minItems = schema.minItems || 0; + const minItems = schema.minItems || 0; const maxItems = schema.maxItems; - if (minItems > 0) { - successiveItems = listItemOperator.repeat(minItems - 1); - minItems--; - } - if (maxItems !== undefined && maxItems > minItems) { - successiveItems += `${listItemOperator}?`.repeat(maxItems - minItems - 1); - } else { - successiveItems += `${listItemOperator}*`; - } - const rule = minItems === 0 - ? `"[" space ( ${itemRuleName} ${successiveItems} )? "]" space` - : `"[" space ${itemRuleName} ${successiveItems} "]" space`; - return this._addRule(ruleName, rule); + return this._addRule(ruleName, '"[" space ' + _buildRepetition(itemRuleName, minItems, maxItems, {separatorRule: '"," space'}) + ' "]" space'); } } else if ((schemaType === undefined || schemaType === 'string') && 'pattern' in schema) { return this._visitPattern(schema.pattern, ruleName); } else if ((schemaType === undefined || schemaType === 'string') && /^uuid[1-5]?$/.test(schema.format || '')) { - return this._addRule( - ruleName === 'root' ? 'root' : schemaFormat, - PRIMITIVE_RULES['uuid']) - } else if ((schemaType === undefined || schemaType === 'string') && schema.format in DATE_RULES) { - for (const [t, r] of Object.entries(DATE_RULES)) { - this._addRule(t, r); - } - return schemaFormat + '-string'; + return this._addPrimitive( + ruleName === 'root' ? 'root' : schemaFormat, + PRIMITIVE_RULES['uuid'] + ); + } else if ((schemaType === undefined || schemaType === 'string') && `${schema.format}-string` in STRING_FORMAT_RULES) { + const primName = `${schema.format}-string` + return this._addRule(ruleName, this._addPrimitive(primName, STRING_FORMAT_RULES[primName])); + } else if (schemaType === 'string' && ('minLength' in schema || 'maxLength' in schema)) { + const charRuleName = this._addPrimitive('char', PRIMITIVE_RULES['char']); + const minLen = schema.minLength || 0; + const maxLen = schema.maxLength; + return this._addRule(ruleName, '"\\\"" ' + _buildRepetition(charRuleName, minLen, maxLen) + ' "\\\"" space'); } else if ((schemaType === 'object') || (Object.keys(schema).length === 0)) { - for (const n of OBJECT_RULE_NAMES) { - this._addRule(n, PRIMITIVE_RULES[n]); - } - return this._addRule(ruleName, 'object'); + return this._addRule(ruleName, this._addPrimitive('object', PRIMITIVE_RULES['object'])); } else { if (!(schemaType in PRIMITIVE_RULES)) { throw new Error(`Unrecognized schema: ${JSON.stringify(schema)}`); } // TODO: support minimum, maximum, exclusiveMinimum, exclusiveMaximum at least for zero - return this._addRule(ruleName === 'root' ? 'root' : schemaType, PRIMITIVE_RULES[schemaType]); + return this._addPrimitive(ruleName === 'root' ? 'root' : schemaType, PRIMITIVE_RULES[schemaType]); + } + } + + _addPrimitive(name, rule) { + let n = this._addRule(name, rule.content); + for (const dep of rule.deps) { + const depRule = PRIMITIVE_RULES[dep] || STRING_FORMAT_RULES[dep]; + if (!depRule) { + throw new Error(`Rule ${dep} not known`); + } + if (!(dep in this._rules)) { + this._addPrimitive(dep, depRule); + } } + return n; } _buildObjectRule(properties, required, name, additionalProperties) { @@ -462,7 +518,7 @@ export class SchemaConverter { const valueRule = this.visit(additionalProperties === true ? {} : additionalProperties, `${subName}-value`); propKvRuleNames['*'] = this._addRule( `${subName}-kv`, - `${this._addRule('string', PRIMITIVE_RULES['string'])} ":" space ${valueRule}`); + `${this._addPrimitive('string', PRIMITIVE_RULES['string'])} ":" space ${valueRule}`); optionalProps.push('*'); } diff --git a/examples/server/server.cpp b/examples/server/server.cpp index b08a09a5..634e653a 100644 --- a/examples/server/server.cpp +++ b/examples/server/server.cpp @@ -859,7 +859,7 @@ struct server_context { slot.sparams.min_keep = json_value(data, "min_keep", default_sparams.min_keep); // process "json_schema" and "grammar" - if (data.contains("json_schema") && data.contains("grammar")) { + if (data.contains("json_schema") && !data["json_schema"].is_null() && data.contains("grammar") && !data["grammar"].is_null()) { send_error(task, "Either \"json_schema\" or \"grammar\" can be specified, but not both", ERROR_TYPE_INVALID_REQUEST); return false; } else if (data.contains("json_schema") && !data.contains("grammar")) { |