Update README with Android SDK Details
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README.md
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@@ -130,139 +130,27 @@ print(f"Generated text: {generated_text}")
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### Android Usage
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import ai.onnxruntime.*
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import java.nio.LongBuffer
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private const val UNK_TOKEN = "<unk>"
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// Token IDs for special tokens
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private const val PAD_ID = 0L
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private const val EOS_ID = 1L
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private const val UNK_ID = 2L
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private const val OFFSET = 3L // Number of special tokens
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}
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fun encode(text: String): LongArray {
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// Convert text to UTF-8 bytes and add offset
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val bytes = text.encodeToByteArray()
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val ids = bytes.map { (it.toInt() and 0xFF).toLong() + OFFSET }.toLongArray()
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// Add EOS token
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return ids + EOS_ID
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}
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fun decode(ids: LongArray): String {
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// Convert IDs back to bytes, handling special tokens
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val bytes = ids.mapNotNull { id ->
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when (id) {
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PAD_ID -> null
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EOS_ID -> null
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UNK_ID -> null
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else -> (id - OFFSET).toByte()
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}
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}.toByteArray()
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return bytes.toString(Charsets.UTF_8)
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}
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}
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class ByteGPTGenerator(
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private val context: Context,
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private val modelPath: String = "model_mobile.ort",
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private val maxLength: Int = 512
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) {
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private val env = OrtEnvironment.getEnvironment()
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private val session: OrtSession
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private val tokenizer = ByteGPTTokenizer()
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init {
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context.assets.open(modelPath).use { modelInput ->
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val modelBytes = modelInput.readBytes()
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session = env.createSession(modelBytes)
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}
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}
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fun generate(prompt: String, maxNewTokens: Int = 50, temperature: Float = 1.0f): String {
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var currentIds = tokenizer.encode(prompt)
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for (i in 0 until maxNewTokens) {
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if (currentIds.size >= maxLength) break
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// Prepare input tensor
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val shape = longArrayOf(1, currentIds.size.toLong())
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val tensorInput = OnnxTensor.createTensor(
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env,
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LongBuffer.wrap(currentIds),
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shape
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)
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// Run inference
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val output = session.run(
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mapOf("input" to tensorInput),
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setOf("output")
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)
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// Get logits for the last token
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val logits = output[0].value as Array<Array<Array<Float>>>
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val lastTokenLogits = logits[0].last()
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// Apply temperature
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if (temperature != 1.0f) {
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for (j in lastTokenLogits.indices) {
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lastTokenLogits[j] /= temperature
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}
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}
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// Convert to probabilities using softmax
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val expLogits = lastTokenLogits.map { Math.exp(it.toDouble()) }
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val sum = expLogits.sum()
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val probs = expLogits.map { it / sum }
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// Sample from distribution
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val random = Math.random()
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var cumsum = 0.0
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var nextToken = 0
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for (j in probs.indices) {
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cumsum += probs[j]
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if (random < cumsum) {
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nextToken = j
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break
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}
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}
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// Append new token
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currentIds = currentIds.plus(nextToken.toLong())
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// Stop if we generate EOS
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if (nextToken == ByteGPTTokenizer.EOS_ID) break
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}
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return tokenizer.decode(currentIds)
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}
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}
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// Usage example:
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val generator = ByteGPTGenerator(context)
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val result = generator.generate("Once upon a time")
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println(result)
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```
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Make sure to:
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1. Add the ONNX Runtime Mobile dependency to your `build.gradle`:
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```gradle
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dependencies {
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implementation
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}
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```
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## π License
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π **CC-BY-NC-4.0**: Free for non-commercial use.
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### Android Usage
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We've just released an Android SDK. You can find the SDK on our [GitHub](https://github.com/ijktech/ByteGPT-Android).
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The SDK can be included in your Android project by adding the following to your `build.gradle` file:
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```
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repositories {
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maven {
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url = uri("https://raw.githubusercontent.com/ijktech/ByteGPT-Android/maven-repo")
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}
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}
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dependencies {
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implementation("com.github.ijktech:ByteGPT-Android:1.0.9")
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}
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```
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### iOS Usage
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Coming Soon!
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## π License
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π **CC-BY-NC-4.0**: Free for non-commercial use.
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