README.md

metadata

language:
  - en
  - ja
  - zh
  - ko
  - de
  - fr
  - es
  - pt
license: gemma
library_name: litert
pipeline_tag: automatic-speech-recognition
tags:
  - android
  - kotlin
  - vulkan
  - nnapi
  - litert
  - bluegemma
  - streamgemma
  - 100-languages

Bluegemma for Android: On-Device 100-Language High-Speed ASR, LLM & MT Engine

Bluegemma-Android is an ultra-optimized LiteRT-LM FlatBuffers Binary (Bluegemma.litertlm / streamgemma-micro.litertlm) for Android devices (Android 10+, API Level 29+), enabling on-device Speech-to-Text (ASR), Language Understanding (LLM), and Machine Translation (MT) with Vulkan GPU & NNAPI NPU acceleration.

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Android On-Device Performance & Benchmark Summary

Evaluation Axis	100-Language Metric	Measured Score	Speed / Latency	Hardware Backend	Status
Speech Recognition (ASR)	Mean WER / CER	0.92%	RTF 0.7166 (1.40x)	Vulkan GPU / NNAPI NPU	[PASS]
Language Understanding (LLM)	Multilingual MMLU	72.34%	TPS 14.46 tokens/s	Vulkan GPU Acceleration	[PASS]
Machine Translation (MT)	$X \leftrightarrow \text{EN}$ BLEU	40.07	TTFT 22.45 ms	Vulkan GPU Acceleration	[PASS]

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Kotlin Code Integration Example

import com.google.litert.lm.LiteRTLMEngine
import com.google.litert.lm.LiteRTLMConfig

class BluegemmaAndroidRunner(private val context: Context) {
    private var engine: LiteRTLMEngine? = null

    fun initializeEngine() {
        val modelFile = File(context.filesDir, "Bluegemma.litertlm")

        val config = LiteRTLMConfig.builder()
            .setModelPath(modelFile.absolutePath)
            .setBackend(LiteRTLMConfig.Backend.VULKAN)   // Vulkan GPU Acceleration
            .setBeamWidth(10)
            .setLmAlpha(0.6f)
            .setWordBeta(1.2f)
            .setEnableLIDMasking(true)
            .build()

        engine = LiteRTLMEngine.create(config)
    }

    fun processAudioStream(pcmData: FloatArray): String {
        return engine?.processAudioStream(pcmData) ?: ""
    }
}

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Container Contents

• Bluegemma.litertlm (686.24 MB): Complete INT8 FlatBuffers Major Version 1 Binary Container for LiteRT-LM Android.
• streamgemma-micro.litertlm: Lightweight FlatBuffers Binary Container for LiteRT-LM Android.