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README.md
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license: mit
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---
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| 1 |
---
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license: mit
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+
language:
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- en
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tags:
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- music-generation
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- midi
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- lstm
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- attention
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- pytorch
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- piano
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- symbolic-music
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- codealpha
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datasets:
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- ktonal/maestro-v3
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- pictureinthenoise/music-generation-with-giantmidi-piano
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---
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# π΅ Music LSTM β Symbolic Piano Generation
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A **Stacked LSTM + Attention** model for symbolic piano music generation, trained on 46 million musical events from ~12,000 MIDI files.
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Built from scratch as part of the **CodeAlpha AI Internship (Task 3)** β no pre-trained model, no external API, just raw deep learning on MIDI data.
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---
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## Model Description
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The model treats music generation as a **next-token prediction** problem β the same principle behind language models like GPT, applied to piano music.
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Each musical event is encoded as a single token representing three attributes simultaneously:
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- **Pitch** β MIDI note value (0β127)
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- **Duration** β discretized into 10 musical buckets (thirty-second β whole note)
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- **Velocity** β discretized into 8 classical nuance buckets (ppp β fff)
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The model learns to predict the next token given a sequence of 64 past tokens, then generates music autoregressively.
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### Architecture
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```
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Token sequence (64 tokens)
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β
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βΌ
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Embedding (vocab_size=6543, dim=256)
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β
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βΌ
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LSTM Layer 1 (hidden=1024) β local patterns: intervals, rhythm
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β
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βΌ
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LSTM Layer 2 (hidden=1024) β higher-level patterns: phrases, motifs
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β
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βΌ
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Attention (additive, Bahdanau-style)
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β
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βΌ
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Linear β Softmax (6543 classes)
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β
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βΌ
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Next token prediction
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```
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| Parameter | Value |
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|---|---|
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| Total parameters | 22,030,480 |
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| Vocabulary size | 6,543 tokens |
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| Sequence length | 64 tokens |
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| Hidden size | 1,024 |
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| LSTM layers | 2 |
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| Embedding dim | 256 |
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| Dropout | 0.3 |
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---
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## Training Data
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| Dataset | Files | Events |
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|---|---|---|
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| [Maestro v3.0.0](https://magenta.tensorflow.org/datasets/maestro) | 1,276 | ~6M |
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| [GiantMIDI-Piano v1.21](https://github.com/bytedance/GiantMIDI-Piano) | 10,841 | ~41M |
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| **Total** | **12,109** | **~46M** |
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Both datasets consist of professional and semi-professional **solo piano** recordings in classical style, ensuring a consistent musical domain.
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Preprocessing used **symusic** (C++ MIDI parser) for fast extraction of pitch, duration, and velocity attributes from raw MIDI files.
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---
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## Training
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Trained on **Kaggle 2ΓT4 GPUs** (30GB VRAM total) using `torch.nn.DataParallel`.
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| Hyperparameter | Value |
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|---|---|
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| Optimizer | Adam (lr=0.001) |
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| Scheduler | ReduceLROnPlateau (factor=0.5, patience=2) |
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| Batch size | 256 |
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| Gradient clipping | 5.0 |
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| Early stopping patience | 5 |
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### Results
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| Epoch | Train Loss | Val Loss |
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|---|---|---|
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| 1 | 6.834 | 6.407 |
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| 4 | 5.906 | 5.900 |
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| **8** | **5.505** | **5.806** β best |
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| 13 | 5.041 | 5.857 β early stop |
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**Best checkpoint: epoch 8, val_loss = 5.805**
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Random baseline: `ln(6543) β 8.78` β the model significantly outperforms random prediction.
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---
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## Usage
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### Quick start
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```bash
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git clone https://github.com/Tahsine/CodeAlpha_Music_Generation
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cd CodeAlpha_Music_Generation
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pip install -r requirements.txt
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```
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The model weights are downloaded automatically from this repo on first run:
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```bash
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# Generate MIDI (256 notes, temperature=0.9)
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python generate.py
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# Full options
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python generate.py \
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--n_tokens 512 \
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--temperature 0.9 \
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--bpm 120 \
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--output artifacts/my_music.mid \
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--device cpu
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```
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### Generate MIDI + WAV
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```bash
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# Install FluidSynth
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sudo apt-get install fluidsynth # Linux
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brew install fluidsynth # macOS
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# Generate audio β soundfont (~30MB) downloads automatically
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python generate.py --n_tokens 512 --temperature 0.9 --audio
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```
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### Temperature guide
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| Temperature | Effect |
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|---|---|
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| `0.7` | Conservative β coherent but repetitive |
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| `0.9` | Balanced β musical and varied *(recommended)* |
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| `1.1` | Creative β surprising but less coherent |
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### Load model directly in Python
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```python
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import torch
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from huggingface_hub import hf_hub_download
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# Download weights
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model_path = hf_hub_download(
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repo_id="KalineZephyr/music-lstm-midi-codealpha",
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filename="best_model.pt",
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)
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# Load checkpoint
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ckpt = torch.load(model_path, map_location="cpu")
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print(f"Best epoch : {ckpt['epoch']}")
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print(f"Val loss : {ckpt['val_loss']:.4f}")
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print(f"Config : {ckpt['config']}")
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```
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---
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## Limitations
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- **Short-range coherence only** β LSTM memory is limited to ~50β100 tokens. The model generates locally coherent phrases but lacks long-range structure (no recurring themes, no global form).
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- **Piano only** β trained exclusively on solo piano data. Other instruments will produce poor results.
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- **Classical/romantic style** β dataset bias toward Western classical music.
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- **No rhythm quantization** β generated durations are discretized into 10 buckets, which may sound mechanical compared to human performance.
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These limitations are inherent to LSTM-based sequence models. A Transformer architecture with full self-attention would address the long-range coherence issue.
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---
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## Repository
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**GitHub:** [Tahsine/CodeAlpha_Music_Generation](https://github.com/Tahsine/CodeAlpha_Music_Generation)
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---
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## License
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MIT
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