Add examples for JS (#3)

* Add examples for JS

* add copyright banner

* update consume package version

* add link for react_native

* add link in main README

Author: fs-eire

Diff for: README.md

@@ -13,6 +13,7 @@ Outline the examples in the repository.
 | Example           | Description                                |
 |-------------------|--------------------------------------------|
 |[Android Image Classifier](mobile/examples/image_classifications/android)| An example application for ONNX Runtime on Android. The example app uses image classification which is able to continuously classify the objects it sees from the device's camera in real-time and displays the most probable inference result on the screen. |
+|[JavaScript API examples](js)| Examples that demonstrates how to use JavaScript API for ONNX Runtime. |
 
 ## Contributing
 

Diff for: js/.gitignore

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+dist
+node_modules
+
+!**/*.onnx
+package-lock.json

Diff for: js/README.md

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+# ONNX Runtime JavaScript examples
+
+## Summary
+
+This folder contains several JavaScript examples. Most of the examples, unless remarked explicitly, are available in all NPM packages as described below:
+
+- [onnxruntime-node](https://github.com/microsoft/onnxruntime/tree/master/js/node): Node.js binding for ONNXRuntime. Can be used in Node.js applications and Node.js compatible environment (eg. Electron.js).
+- [onnxruntime-web](https://github.com/microsoft/onnxruntime/tree/master/js/web): ONNXRuntime on browsers.
+- [onnxruntime-react-native](https://github.com/microsoft/onnxruntime/tree/master/js/react_native): ONNXRuntime for React Native applications on Android and iOS.
+
+## Usage
+
+Click links for README of each examples.
+
+### Quick Start
+
+* [Quick Start - Nodejs Binding](quick-start_onnxruntime-node) - a demonstration of basic usage of ONNX Runtime Node.js binding.
+
+* [Quick Start - Web (using script tag)](quick-start_onnxruntime-web-script-tag) - a demonstration of basic usage of ONNX Runtime Web using script tag.
+
+* [Quick Start - Web (using bundler)](quick-start_onnxruntime-web-bundler) - a demonstration of basic usage of ONNX Runtime Web using a bundler.
+
+### API usage
+
+* [API usage - Tensor](api-usage_tensor) - a demonstration of basic usage of `Tensor`.
+
+* [API usage - InferenceSession](api-usage_inference-session) - a demonstration of basic usage of `InferenceSession`.

Diff for: js/api-usage_inference-session/README.md

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+# API usage - InferenceSession
+
+## Summary
+
+This example is a demonstration of basic usage of `InferenceSession`.
+
+- `inference-session-create.js`: In this example, we create `InferenceSession` in different ways.
+- `inference-session-properties.js`: In this example, we get input/output names from an `InferenceSession` object.
+- `inference-session-run.js`: In this example, we run the model inferencing in different ways.
+
+For more information about `SessionOptions` and `RunOptions`, please refer to other examples.
+
+## Usage
+
+```sh
+npm install
+node ./inference-session-create.js
+node ./inference-session-properties.js
+node ./inference-session-run.js
+```

Diff for: js/api-usage_inference-session/inference-session-create.js

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+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT license.
+
+const fs = require('fs');
+const util = require('util');
+const ort = require('onnxruntime-node');
+
+// following code also works for onnxruntime-web.
+
+const InferenceSession = ort.InferenceSession;
+
+// use an async context to call onnxruntime functions.
+async function main() {
+    try {
+        // create session option object
+        const options = createMySessionOptions();
+
+        //
+        // create inference session from a ONNX model file path or URL
+        //
+        const session01 = await InferenceSession.create('./model.onnx');
+        const session01_B = await InferenceSession.create('./model.onnx', options); // specify options
+
+        //
+        // create inference session from an Node.js Buffer (Uint8Array)
+        //
+        const buffer02 = await readMyModelDataFile('./model.onnx'); // buffer is Uint8Array
+        const session02 = await InferenceSession.create(buffer02);
+        const session02_B = await InferenceSession.create(buffer02, options); // specify options
+
+        //
+        // create inference session from an ArrayBuffer
+        //
+        const arrayBuffer03 = buffer02.buffer;
+        const offset03 = buffer02.byteOffset;
+        const length03 = buffer02.byteLength;
+        const session03 = await InferenceSession.create(arrayBuffer03, offset03, length03);
+        const session03_B = await InferenceSession.create(arrayBuffer03, offset03, length03, options); // specify options
+
+        // example for browser
+        //const arrayBuffer03_C = await fetchMyModel('./model.onnx');
+        //const session03_C = await InferenceSession.create(arrayBuffer03_C);
+    } catch (e) {
+        console.error(`failed to create inference session: ${e}`);
+    }
+}
+
+main();
+
+function createMySessionOptions() {
+    // session options: please refer to the other example for details usage for session options
+
+    // example of a session option object in node.js:
+    // specify intra operator threads number to 1 and disable CPU memory arena
+    return { intraOpNumThreads: 1, enableCpuMemArena: false }
+
+    // example of a session option object in browser:
+    // specify WebAssembly exection provider
+    //return { executionProviders: ['wasm'] };
+
+}
+
+async function readMyModelDataFile(filepathOrUri) {
+    // read model file content (Node.js) as Buffer (Uint8Array)
+    return await util.promisify(fs.readFile)(filepathOrUri);
+}
+
+async function fetchMyModel(filepathOrUri) {
+    // use fetch to read model file (browser) as ArrayBuffer
+    if (typeof fetch !== 'undefined') {
+        const response = await fetch(filepathOrUri);
+        return await response.arrayBuffer();
+    }
+}

Diff for: js/api-usage_inference-session/inference-session-properties.js

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+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT license.
+
+const ort = require('onnxruntime-node');
+
+// following code also works for onnxruntime-web.
+
+const InferenceSession = ort.InferenceSession;
+
+// use an async context to call onnxruntime functions.
+async function main() {
+    try {
+        // create session and load model.onnx
+        const session = await InferenceSession.create('./model.onnx');;
+
+        //
+        // get input/output names from inference session object
+        //
+        const inputNames = session.inputNames;
+        const outputNames = session.outputNames;
+
+    } catch (e) {
+        console.error(`failed to create inference session: ${e}`);
+    }
+}
+
+main();

Diff for: js/api-usage_inference-session/inference-session-run.js

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+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT license.
+
+const ort = require('onnxruntime-node');
+
+// following code also works for onnxruntime-web.
+
+const InferenceSession = ort.InferenceSession;
+const Tensor = ort.Tensor;
+
+// use an async context to call onnxruntime functions.
+async function main() {
+    try {
+        // create session and load model.onnx
+        const session = await InferenceSession.create('./model.onnx');
+
+        // prepare inputs
+        const dataA = prepareDataA(); // Float32Array(12)
+        const dataB = prepareDataB(); // Float32Array(12)
+        const tensorA = new ort.Tensor('float32', dataA, [3, 4]);
+        const tensorB = new ort.Tensor('float32', dataB, [4, 3]);
+
+        // prepare feeds. use model input names as keys.
+        const feeds = {
+            a: new Tensor('float32', dataA, [3, 4]),
+            b: new Tensor('float32', dataB, [4, 3])
+        };
+
+        // run options
+        const option = createRunOptions();
+
+        //
+        // feed inputs and run
+        //
+        const results_02 = await session.run(feeds);
+        const results_02_B = await session.run(feeds, option); // specify options
+
+        //
+        // run with specified names of fetches (outputs)
+        //
+        const results_03 = await session.run(feeds, ['c']);
+        const results_03_B = await session.run(feeds, ['c'], option); // specify options
+
+        //
+        // run with fetches (outputs) as nullable map
+        //
+        const results_04 = await session.run(feeds, { c: null });
+        const results_04_B = await session.run(feeds, { c: null }, option); // specify options
+
+        //
+        // run with fetches (outputs) as nullable map, with tensor as value
+        //
+        const preAllocatedTensorC = new Tensor(new Float32Array(9), [3, 3]);
+        const results_05 = await session.run(feeds, { c: preAllocatedTensorC });
+        const results_05_B = await session.run(feeds, { c: preAllocatedTensorC }, option); // specify options
+
+    } catch (e) {
+        console.error(`failed to inference ONNX model: ${e}.`);
+    }
+}
+
+main();
+
+function prepareDataA() {
+    return Float32Array.from([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]);
+}
+function prepareDataB() {
+    return Float32Array.from([10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120]);
+}
+
+function createRunOptions() {
+    // run options: please refer to the other example for details usage for run options
+
+    // specify log verbose to this inference run
+    return { logSeverityLevel: 0 };
+}

Diff for: js/api-usage_inference-session/model.onnx

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+backend-test:b
+
+
a
+
b
c"MatMultest_matmul_2dZ
+
a
+

+
+Z
+
b
+

+
+b
+
c
+

+
+B	

Diff for: js/api-usage_inference-session/package.json

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+{
+  "name": "api-usage_inference-session",
+  "private": true,
+  "version": "1.0.0",
+  "description": "This example is a demonstration of basic usage of InferenceSession.",
+  "main": "index.js",
+  "dependencies": {
+    "onnxruntime-node": "^1.8.0"
+  }
+}

Diff for: js/api-usage_tensor/README.md

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+# API usage - Create Tensor
+
+## Summary
+
+This example is a demonstration of basic usage of `Tensor`.
+
+- `tensor-create.js`: In this example, we create tensors in different ways.
+- `tensor-properties.js`: In this example, we get tensor properties from a Tensor object.
+
+## Usage
+
+```sh
+npm install
+node ./tensor-create.js
+node ./tensor-properties.js
+```

Diff for: js/api-usage_tensor/package.json

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+{
+  "name": "api-usage_create-tensor",
+  "private": true,
+  "version": "1.0.0",
+  "description": "This example is a demonstration of basic usage of Tensor.",
+  "dependencies": {
+    "onnxruntime-node": "^1.8.0"
+  }
+}

Diff for: js/api-usage_tensor/tensor-create.js

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+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT license.
+
+const ort = require('onnxruntime-node');
+
+// following code also works for onnxruntime-web.
+
+const Tensor = ort.Tensor;
+
+//
+// create a [2x3x4] float tensor
+//
+const buffer01 = new Float32Array(24);
+buffer01[0] = 0.1; // fill buffer data
+const tensor01 = new Tensor('float32', buffer01, [2, 3, 4]);
+// type 'float32' can be omitted and the type is inferred from data
+const tensor01_B = new Tensor(buffer01, [2, 3, 4]);
+
+//
+// create a [1x2] boolean tensor
+//
+const buffer02 = new Uint8Array(2);
+buffer02[0] = 1;  // true
+buffer02[1] = 0;  // false
+const tensor02 = new Tensor('bool', buffer02, [1, 2]); // type 'bool' cannot omit as both 'bool' and 'uint8' uses Uint8Array.
+
+//
+// create a scaler float64 tensor
+//
+const tensor03 = new Tensor(new Float64Array(1), []);
+tensor03.data[0] = 1.0; // setting data after tensor is created is allowed
+
+//
+// create a one-dimension tensor
+//
+const tensor04 = new Tensor(new Float32Array(100), [100]);
+const tensor04_B = new Tensor(new Float32Array(100));  // dims can be omitted if it is a 1-D tensor. tensor04.dims = [100]
+
+//
+// create a [1x2] string tensor
+//
+const tensor05 = new Tensor('string', ['a', 'b'], [1, 2]);
+const tensor05_B = new Tensor(['a', 'b'], [1, 2]); // type 'string' can be omitted
+
+//
+// !!! BAD USAGES !!!
+// followings are bad usages that may cause an error to be thrown. try not to make these mistakes.
+//
+
+// create from mismatched TypedArray
+try {
+    const tensor = new Tensor('float64', new Float32Array(100)); // 'float64' must use with Float64Array as data.
+} catch{ }
+
+// bad dimension (negative value)
+try {
+    const tensor = new Tensor(new Float32Array(100), [1, 2, -1]); // negative dims is not allowed.
+} catch{ }
+
+// size mismatch (scalar size should be 1)
+try {
+    const tensor = new Tensor(new Float32Array(0), []);
+} catch{ }
+
+// size mismatch (5 * 6 != 40)
+try {
+    const tensor = new Tensor(new Float32Array(40), [5, 6]);
+} catch{ }