{
  "model_type": "symphonym",
  "architectures": ["UniversalEncoder"],
  "version": "v7",

  "vocab_size": 113280,
  "num_scripts": 25,
  "num_langs": 1944,
  "num_length_buckets": 16,

  "char_embed_dim": 64,
  "script_embed_dim": 16,
  "lang_embed_dim": 16,
  "length_embed_dim": 8,
  "hidden_dim": 128,
  "embed_dim": 128,
  "num_layers": 2,
  "num_attention_heads": 2,
  "dropout": 0.2,
  "lang_dropout": 0.5,

  "max_toponym_len": 50,

  "teacher": {
    "architectures": ["PhoneticEncoder"],
    "phonetic_feat_dim": 192,
    "hidden_dim": 128,
    "embed_dim": 128,
    "num_layers": 2,
    "num_attention_heads": 2,
    "dropout": 0.2,
    "note": "PanPhon192: 8-bin positional pooling of 24-dim articulatory features"
  },

  "training": {
    "phase1_epochs": 50,
    "phase2_epochs": 50,
    "phase3_epochs": 30,
    "phase1_val_loss": 0.0056,
    "phase2_student_teacher_cosine": 0.942,
    "phase3_val_loss": 0.021217376736320875,
    "triplet_margin": 0.3,
    "phase1_lr": 1e-4,
    "phase2_lr": 5e-4,
    "phase3_lr": 5e-5,
    "phase1_batch_size": 2048,
    "phase2_batch_size": 1024,
    "phase3_batch_size": 1024,
    "weight_decay": 1e-5,
    "warmup_epochs": 2,
    "noise_prob": 0.3,
    "mse_weight": 1.0,
    "cosine_weight": 1.0,
    "phase2_alpha": 0.5,
    "phase2_loss": "alpha * MSE(student, teacher) + (1 - alpha) * (1 - cosine(student, teacher))",
    "phase3_loss": "triplet_margin(anchor, positive, hard_negative, margin=0.3)"
  },

  "g2p": {
    "backends": ["epitran", "phonikud", "charsiu_g2p"],
    "epitran_extensions": 102,
    "scripts_covered": 20,
    "ipa_coverage": 0.540,
    "panphon_bins": 8,
    "panphon_feat_dim": 24,
    "panphon192_dim": 192
  },

  "index": {
    "total_toponyms": 66924548,
    "embedding_coverage": 1.0,
    "quantization": "int8",
    "ann_backend": "elasticsearch_hnsw"
  }
}