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pickle.js
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pickle.js
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// Experimental
var pickle = pickle || {};
pickle.ModelFactory = class {
match(context) {
const stream = context.stream;
const signature = [ 0x80, undefined, 0x8a, 0x0a, 0x6c, 0xfc, 0x9c, 0x46, 0xf9, 0x20, 0x6a, 0xa8, 0x50, 0x19 ];
if (stream && signature.length <= stream.length && stream.peek(signature.length).every((value, index) => signature[index] === undefined || signature[index] === value)) {
// Reject PyTorch models with .pkl file extension.
return null;
}
const obj = context.open('pkl');
if (obj !== undefined) {
const name = obj && obj.__class__ && obj.__class__.__module__ && obj.__class__.__name__ ? obj.__class__.__module__ + '.' + obj.__class__.__name__ : '';
if (!name.startsWith('__torch__.')) {
return obj;
}
}
return null;
}
open(context, match) {
return Promise.resolve().then(() => {
let format = 'Pickle';
const obj = match;
if (obj === null || obj === undefined) {
context.exception(new pickle.Error("Unsupported Pickle null object in '" + context.identifier + "'."));
}
else if (Array.isArray(obj)) {
if (obj.length > 0 && obj[0] && obj.every((item) => item && item.__class__ && obj[0].__class__ && item.__class__.__module__ === obj[0].__class__.__module__ && item.__class__.__name__ === obj[0].__class__.__name__)) {
const type = obj[0].__class__.__module__ + "." + obj[0].__class__.__name__;
context.exception(new pickle.Error("Unsupported Pickle '" + type + "' array object in '" + context.identifier + "'."));
}
else if (obj.length > 0) {
context.exception(new pickle.Error("Unsupported Pickle array object in '" + context.identifier + "'."));
}
}
else if (obj && obj.__class__) {
const formats = new Map([
[ 'cuml.ensemble.randomforestclassifier.RandomForestClassifier', 'cuML' ]
]);
const type = obj.__class__.__module__ + "." + obj.__class__.__name__;
if (formats.has(type)) {
format = formats.get(type);
}
else {
context.exception(new pickle.Error("Unsupported Pickle type '" + type + "'."));
}
}
else {
context.exception(new pickle.Error('Unsupported Pickle object.'));
}
return new pickle.Model(obj, format);
});
}
};
pickle.Model = class {
constructor(value, format) {
this._format = format;
this._graphs = [ new pickle.Graph(value) ];
}
get format() {
return this._format;
}
get graphs() {
return this._graphs;
}
};
pickle.Graph = class {
constructor(obj) {
this._inputs = [];
this._outputs = [];
this._nodes = [];
if (Array.isArray(obj) && (obj.every((item) => item.__class__) || (obj.every((item) => Array.isArray(item))))) {
for (const item of obj) {
this._nodes.push(new pickle.Node(item));
}
}
else if (obj && obj instanceof Map) {
for (const entry of obj) {
this._nodes.push(new pickle.Node(entry[1], entry[0]));
}
}
else if (obj && obj.__class__) {
this._nodes.push(new pickle.Node(obj));
}
else if (obj && Object(obj) === obj) {
this._nodes.push(new pickle.Node(obj));
}
}
get inputs() {
return this._inputs;
}
get outputs() {
return this._outputs;
}
get nodes() {
return this._nodes;
}
};
pickle.Node = class {
constructor(obj, name) {
this._name = name || '';
this._inputs = [];
this._outputs = [];
this._attributes = [];
if (Array.isArray(obj)) {
this._type = { name: 'List' };
this._attributes.push(new pickle.Attribute('value', obj));
}
else {
const type = obj.__class__ ? obj.__class__.__module__ + '.' + obj.__class__.__name__ : 'Object';
this._type = { name: type };
for (const entry of Object.entries(obj)) {
const name = entry[0];
const value = entry[1];
this._attributes.push(new pickle.Attribute(name, value));
}
}
}
get type() {
return this._type;
}
get name() {
return this._name;
}
get inputs() {
return this._inputs;
}
get outputs() {
return this._outputs;
}
get attributes() {
return this._attributes;
}
};
pickle.Attribute = class {
constructor(name, value) {
this._name = name;
this._value = value;
if (value && value.__class__) {
this._type = value.__class__.__module__ + '.' + value.__class__.__name__;
}
}
get name() {
return this._name;
}
get value() {
return this._value;
}
get type() {
return this._type;
}
};
pickle.Error = class extends Error {
constructor(message) {
super(message);
this.name = 'Error loading Pickle model.';
}
};
if (typeof module !== 'undefined' && typeof module.exports === 'object') {
module.exports.ModelFactory = pickle.ModelFactory;
}