{
  "serializer": "vln_append_only_chat_v1",
  "template_sha256": "fb79cf3922f74475e9a5faaac8c08d2f79a3ca7bef5dbf434f3f7726119229b8",
  "actions": [
    "MOVE_FORWARD",
    "TURN_LEFT",
    "TURN_RIGHT",
    "STOP"
  ],
  "habitat_ids": [
    1,
    2,
    3,
    0
  ],
  "action_token_ids": [
    [
      28164,
      61846,
      248046
    ],
    [
      15834,
      18440,
      248046
    ],
    [
      15834,
      20549,
      248046
    ],
    [
      48964,
      248046
    ]
  ],
  "eos": 248046,
  "separator_ids": [
    198
  ],
  "rgb_shape": [
    480,
    640,
    3
  ],
  "position_convention": "logical_text_plus_native_mrope_v1",
  "rotary_precision": "fp32_preserved_across_module_casts_v1",
  "config": {
    "generation": {
      "fixed_separator": "\n",
      "max_response_tokens_including_eos": 16
    },
    "memory": {
      "evict_before_new_step": true,
      "kv_guard_tokens": 5120,
      "kv_window_steps_including_current": 8,
      "mode": "window8"
    },
    "model": {
      "backbone": "Qwen/Qwen3.5-4B",
      "output_mode": "qwen_text",
      "revision": "851bf6e806efd8d0a36b00ddf55e13ccb7b8cd0a",
      "step_lane": {
        "enabled": true,
        "version": "parallel_step_lane_v1",
        "layers": [
          16,
          20,
          24,
          28
        ],
        "init_seed": 429,
        "clock_mode": "step_end"
      }
    },
    "observations": {
      "append_action_tokens": true,
      "expected_rgb_shape": [
        480,
        640,
        3
      ],
      "expected_visual_tokens": 300,
      "max_prefix_tokens": 2048,
      "max_step_group_tokens": 384,
      "serializer_version": "vln_append_only_chat_v1"
    },
    "runtime": {
      "action_diagnostics": false,
      "max_logical_context_tokens": 262144,
      "profile_components": false,
      "window_attention_batch_steps": 16,
      "text_attention": "simplememvln_step_attention",
      "vision_attention": "flash_attention_2",
      "vision_microbatch_images": 4
    },
    "training": {
      "activation_offload_min_tokens": 65536,
      "backbone_lr": 5e-06,
      "checkpoint_decoder_layers": true,
      "class_weighting": "none",
      "classifier_lr": 5e-06,
      "dataloader_num_workers": 4,
      "effective_number_beta": 0.9999,
      "epochs": 2,
      "expected_total_steps": 7704,
      "expected_warmup_steps": 232,
      "gradient_accumulation_steps": 2,
      "length_bucket_pool_episodes": 64,
      "microbatch_episodes_per_rank": 1,
      "model_max_length": 262144,
      "nominal_episodes_per_update": 8,
      "save_strategy": "epoch",
      "save_total_limit": null,
      "seed": 429,
      "supervise_assistant_terminator": true,
      "tail_policy": "accelerate_repeat",
      "use_cache": false,
      "warmup_steps": 232,
      "weight_decay": 0.01,
      "step_lane_lr": 0.0001
    }
  },
  "step_lane": {
    "version": "parallel_step_lane_v1",
    "layers": [
      16,
      20,
      24,
      28
    ],
    "num_key_heads": 2,
    "num_value_heads": 4,
    "key_dim": 128,
    "value_dim": 128,
    "clock_mode": "step_end",
    "prefix_mode": "read_only_zero",
    "half_lives_steps": [
      8.0,
      24.0,
      64.0,
      192.0
    ],
    "beta_init": 0.1,
    "token_rate_reference": null,
    "projection_init_std": 0.02,
    "eps": 1e-06
  }
}