Launch qualified small no-semantic MsTok ablation: 13.5B exposure, matched long LR horizon

ablations/iclr-debug-ablation-no-semantic-13p5b-v1/README.md

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+# Small MsTok no-semantic ablation — 13.5B exposure
+
+Launched on September 19, 2026 from clean branch commit dcdf3361ed8dce2d2662dc971ef7d112cf2b1810 after stopping and archiving the shortened-decay generator run.
+
+This is a fresh joint tokenizer/generator run, using the latest branch's matched component-ablation recipe. The sole scientific intervention is `semantic.weight: 0.0`: no RoBERTa alignment gradient. The frozen RoBERTa forward, semantic projector, teacher copy, reconstruction/VQ losses, auxiliary L1/decoded KL losses, teacher EMA and random draws are retained to match the full method's computation. Logged raw semantic loss can remain nonzero while its objective contribution and projector gradient are zero.
+
+- Small generator: 12 layers, width 768. Codec width 384, context 256, 16 square levels, 16K codebooks.
+- Batch: 32 per GPU ×8 GPUs ×12 accumulation =3,072 sequences per optimizer step.
+- BF16 training, loss-scope fullgraph torch.compile with Inductor/default.
+- Fresh initialization; does not use the previous frozen tokenizer or generator checkpoint.
+- Production stops automatically at step 17,167 =13,500,678,144 input positions.
+- Nominal budget and both LR decay horizons remain 135B positions /171,662 updates; generator warmup remains 300 updates. The previous generator's shortened LR schedule is not applied to this ablation.
+- Generation evaluations at steps 10,000 and 17,167: strict FP32 GPT-2 Large reference, TF32 disabled, five seeds ×128 samples, temperature 1, no truncation, true level-zero supplied.
+- Retained checkpoints at 1,272; 6,358; 10,000; 17,167 plus rolling checkpoints. Automatic checkpoint/results backups use this HF directory.
+
+Qualification: 81 CPU tests passed, with three opt-in GPU tests skipped in that pass; the no-semantic CUDA/Inductor gradient-parity test passed separately. The eight-GPU 32-step pilot exercised all 15 auxiliary target levels, saved at step 16, resumed and finished at step 32. The pilot gate verified finite model/optimizer state, expected schedule/config, source identity, and memory headroom. See pilot-qualification.json and test-results.json. Production is a separate from-scratch run.
+
+The prior generator's last (39k), best-validation (38k), and evaluated (12,875/25,750) checkpoints and results were archived/verified in HF commit 94b11f0e65b05b219f716586a0c47ca554fc5c69. Local pre-pull edits were preserved in git stash and an external patch backup. The current production source is an immutable clean checkout.

ablations/iclr-debug-ablation-no-semantic-13p5b-v1/decoder-mstok/config.yaml

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+task: mstok-next-concept
+experiment: iclr-debug-ablation-no-semantic-13p5b-v1-decoder-mstok
+experiment_dir: /home/ubuntu/mstok-results/iclr-debug-ablation-no-semantic-13p5b-v1/decoder-mstok
+dataset:
+  train_source: /home/ubuntu/data/full_owt/train_gpt2.bin
+  validate_source: /home/ubuntu/data/full_owt/valid_gpt2.bin
+  pad_token_id: 50257
+pre_tokenizer:
+  name: hf
+  tokenizer: hf
+  model_id: gpt2
+  special_tokens:
+    eos_token: <|endoftext|>
+    pad_token: <|pad|>
+codec:
+  n_layers: 6
+  context_length: 256
+  embed_dim: 384
+  in_vocab_size: 50304
+  vqvae_vocab_size:
+  - 16384
+  - 16384
+  - 16384
+  - 16384
+  - 16384
+  - 16384
+  - 16384
+  - 16384
+  - 16384
+  - 16384
+  - 16384
+  - 16384
+  - 16384
+  - 16384
+  - 16384
+  - 16384
+  compression_factor: 1
+  dropout: 0.1
+  pre_quant_groupnorm: 4
+  pre_quant_dropout: 0.2
+  vector_quantizer_config:
+    clss: multiscale_residual_vector_quantizer
+    decay: 0.99
+    epsilon: 1.0e-05
+    commitment_cost: 0.25
+    learned_l1_sampling: true
+    learned_all_sampling: false
+    quant_resi:
+      enabled: true
+      ratio: 0.5
+      share_mode: 0
+      learnable_ratio: false
+    levels:
+      use_manual_levels: true
+      manual_levels:
+      - 1
+      - 4
+      - 9
+      - 16
+      - 25
+      - 36
+      - 49
+      - 64
+      - 81
+      - 100
+      - 121
+      - 144
+      - 169
+      - 196
+      - 225
+      - 256
+    aux:
+      fine_drop:
+        prob: 0.5
+        min_keep: 1
+generator:
+  n_layer: 12
+  n_head: 12
+  bias: true
+  dropout: 0.1
+  n_embd: 768
+  context_length: 256
+  vocab_size:
+  - 16384
+  - 16384
+  - 16384
+  - 16384
+  - 16384
+  - 16384
+  - 16384
+  - 16384
+  - 16384
+  - 16384
+  - 16384
+  - 16384
+  - 16384
+  - 16384
+  - 16384
+  attn_pattern: block_diagonal
+  use_positional_encoding: true
+  use_level_encoding: true
+  prefix_len: 0
+  use_rope: true
+  rope_base: 10000
+  use_qk_norm: true
+  post_upsample_conv:
+    enabled: true
+    kernel_size: 3
+  use_relu2: true
+  use_flex_attention: true
+  shared_output_head: true
+  shared_head_per_level_bias: false
+  shared_head_per_level_scale: false
+  shared_head_adapter_rank: 0
+objectives:
+  codec_weight: 1.0
+  ncp_weight: 1.0
+  soft_assignment_temperature: 1.0
+  prediction_temperature: 1.0
+  mstok_weight: 0.25
+  residual_weight: 1.0
+  reconstruction_weight: 1.0
+  teacher_ema_decay: 0.999
+  teacher_ema_warmup_steps: 1000
+  mstok_warmup_steps: 500
+optimization:
+  codec_lr: 0.001
+  codec_min_lr: 0.0001
+  codec_warmup_iters: 0
+  codec_lr_decay_iters: 171662
+  generator_lr: 0.0005
+  generator_min_lr: 1.0e-05
+  generator_warmup_iters: 300
+  generator_lr_decay_iters: 171662
+  beta_1: 0.9
+  codec_beta_2: 0.99
+  generator_beta_2: 0.99
+  weight_decay: 0.1
+  max_grad_norm: 1.0
+  level_loss_alpha: 1.0
+  grad_accumulation_steps: 12
+  corruption:
+    mode: per_level
+    per_level_probs:
+    - 0.85
+    - 0.8321428571
+    - 0.8142857143
+    - 0.7964285714
+    - 0.7785714286
+    - 0.7607142857
+    - 0.7428571429
+    - 0.725
+    - 0.7071428571
+    - 0.6892857143
+    - 0.6714285714
+    - 0.6535714286
+    - 0.6357142857
+    - 0.6178571429
+    - 0.6
+    skip_level0: true
+training:
+  log_interval: 10
+  eval_interval: 1000
+  checkpoint_interval: 1000
+  eval_batch_size: 4
+  val_iters: 25
+  keep_last: 3
+  seed: 55
+  codec_initialization_seed: 42
+  generator_initialization_seed: 55
+  total_iters: 171662
+  batch_size: 32
+  expected_world_size: 8
+  expected_global_batch_size: 3072
+  resume_checkpoint: null
+  milestone_steps:
+  - 1272
+  - 6358
+  - 10000
+  - 17167
+  generation_eval_steps:
+  - 10000
+  - 17167
+torch_compile:
+  enable: true
+  scope: loss
+  mode: default
+  dynamic: false
+  fullgraph: true
+  backend: inductor
+mixed_precision:
+  enable: true
+wandb:
+  entity: mstok
+  project: iclr-debug
+  group: full-owt-ctx256-16sq-135b-v1
+  enable: true
+  id: iclr-debug-ablation-no-semantic-13p5b-v1-decoder-mstok
+  resume: allow
+  gradients_and_params:
+    enable: false
+    log: all
+    log_freq: 1000
+export:
+  vqvae_config_template: /home/ubuntu/mstok-runs/iclr-debug-no-semantic-20260919/config/repro-ctx256/vqvae.yaml
+  ncp_config_template: /home/ubuntu/mstok-runs/iclr-debug-no-semantic-20260919/config/repro-ctx256/ncp-sharedhead.yaml
+semantic:
+  enabled: true
+  mode: eostok
+  weight: 0.0
+  warmup_steps: 500
+  teacher_id: FacebookAI/roberta-base
+  teacher_revision: e2da8e2f811d1448a5b465c236feacd80ffbac7b
+  tokenizer_revision: 607a30d783dfa663caf39e06633721c8d4cfcd7e
+  teacher_dim: 768
+  feature_layer: 6
+  projector_dim: 2048
+  projector_seed: 56
+  alignment_site: decoder
+iclr_debug:
+  stage: decoder-mstok
+  target_positions: 135000000000
+  lr_horizon_positions: 135000000000
+  stop_step: 17167
+  pilot: false
+  tokenizer_checkpoint: null
+  tokenizer_steps: null
+  budget_unit: input positions including padding; log non-padding tokens separately
+  ablation: no-semantic

ablations/iclr-debug-ablation-no-semantic-13p5b-v1/git-provenance.json

@@ -0,0 +1,3 @@
+{
+  "commit": "dcdf3361ed8dce2d2662dc971ef7d112cf2b1810"
+}

ablations/iclr-debug-ablation-no-semantic-13p5b-v1/launch.sh

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+#!/usr/bin/env bash
+set -euo pipefail
+cd /home/ubuntu/mstok-runs/iclr-debug-no-semantic-20260919
+export OMP_NUM_THREADS=1
+export HF_HUB_DISABLE_PROGRESS_BARS=1
+export TOKENIZERS_PARALLELISM=false
+/home/ubuntu/miniconda3/envs/mstok/bin/python -u scripts/run_iclr_debug.py \
+  --variant decoder-mstok --model-size small --ablation no-semantic --joint-microbatch 32 \
+  --joint-positions 135000000000 --stop-after-steps 17167 \
+  --data-dir /home/ubuntu/data/full_owt \
+  --output /home/ubuntu/mstok-results/iclr-debug-ablation-no-semantic-pilot-v1 \
+  --pilot-steps 32
+/home/ubuntu/miniconda3/envs/mstok/bin/python -u /home/ubuntu/mstok-results/launchers/verify-no-semantic-pilot-20260919.py
+exec /home/ubuntu/miniconda3/envs/mstok/bin/python -u scripts/run_iclr_debug.py \
+  --variant decoder-mstok --model-size small --ablation no-semantic --joint-microbatch 32 \
+  --joint-positions 135000000000 --stop-after-steps 17167 \
+  --data-dir /home/ubuntu/data/full_owt \
+  --output /home/ubuntu/mstok-results/iclr-debug-ablation-no-semantic-13p5b-v1 \
+  --hf-repo iskhare/iclr-debug

ablations/iclr-debug-ablation-no-semantic-13p5b-v1/manifest.json

@@ -0,0 +1,528 @@
+{
+  "format": "iclr-debug-production-v1",
+  "variant": "decoder-mstok",
+  "configs": {
+    "decoder-mstok": {
+      "task": "mstok-next-concept",
+      "experiment": "iclr-debug-ablation-no-semantic-13p5b-v1-decoder-mstok",
+      "experiment_dir": "/home/ubuntu/mstok-results/iclr-debug-ablation-no-semantic-13p5b-v1/decoder-mstok",
+      "dataset": {
+        "train_source": "/home/ubuntu/data/full_owt/train_gpt2.bin",
+        "validate_source": "/home/ubuntu/data/full_owt/valid_gpt2.bin",
+        "pad_token_id": 50257
+      },
+      "pre_tokenizer": {
+        "name": "hf",
+        "tokenizer": "hf",
+        "model_id": "gpt2",
+        "special_tokens": {
+          "eos_token": "<|endoftext|>",
+          "pad_token": "<|pad|>"
+        }
+      },
+      "codec": {
+        "n_layers": 6,
+        "context_length": 256,
+        "embed_dim": 384,
+        "in_vocab_size": 50304,
+        "vqvae_vocab_size": [
+          16384,
+          16384,
+          16384,
+          16384,
+          16384,
+          16384,
+          16384,
+          16384,
+          16384,
+          16384,
+          16384,
+          16384,
+          16384,
+          16384,
+          16384,
+          16384
+        ],
+        "compression_factor": 1,
+        "dropout": 0.1,
+        "pre_quant_groupnorm": 4,
+        "pre_quant_dropout": 0.2,
+        "vector_quantizer_config": {
+          "clss": "multiscale_residual_vector_quantizer",
+          "decay": 0.99,
+          "epsilon": 1e-05,
+          "commitment_cost": 0.25,
+          "learned_l1_sampling": true,
+          "learned_all_sampling": false,
+          "quant_resi": {
+            "enabled": true,
+            "ratio": 0.5,
+            "share_mode": 0,
+            "learnable_ratio": false
+          },
+          "levels": {
+            "use_manual_levels": true,
+            "manual_levels": [
+              1,
+              4,
+              9,
+              16,
+              25,
+              36,
+              49,
+              64,
+              81,
+              100,
+              121,
+              144,
+              169,
+              196,
+              225,
+              256
+            ]
+          },
+          "aux": {
+            "fine_drop": {
+              "prob": 0.5,
+              "min_keep": 1
+            }
+          }
+        }
+      },
+      "generator": {
+        "n_layer": 12,
+        "n_head": 12,
+        "bias": true,
+        "dropout": 0.1,
+        "n_embd": 768,
+        "context_length": 256,
+        "vocab_size": [
+          16384,
+          16384,
+          16384,
+          16384,
+          16384,
+          16384,
+          16384,
+          16384,
+          16384,
+          16384,
+          16384,
+          16384,
+          16384,
+          16384,
+          16384
+        ],
+        "attn_pattern": "block_diagonal",
+        "use_positional_encoding": true,
+        "use_level_encoding": true,
+        "prefix_len": 0,
+        "use_rope": true,
+        "rope_base": 10000,
+        "use_qk_norm": true,
+        "post_upsample_conv": {
+          "enabled": true,
+          "kernel_size": 3
+        },
+        "use_relu2": true,
+        "use_flex_attention": true,
+        "shared_output_head": true,
+        "shared_head_per_level_bias": false,
+        "shared_head_per_level_scale": false,
+        "shared_head_adapter_rank": 0
+      },
+      "objectives": {
+        "codec_weight": 1.0,
+        "ncp_weight": 1.0,
+        "soft_assignment_temperature": 1.0,
+        "prediction_temperature": 1.0,
+        "mstok_weight": 0.25,
+        "residual_weight": 1.0,
+        "reconstruction_weight": 1.0,
+        "teacher_ema_decay": 0.999,
+        "teacher_ema_warmup_steps": 1000,
+        "mstok_warmup_steps": 500
+      },
+      "optimization": {
+        "codec_lr": 0.001,
+        "codec_min_lr": 0.0001,
+        "codec_warmup_iters": 0,
+        "codec_lr_decay_iters": 171662,
+        "generator_lr": 0.0005,
+        "generator_min_lr": 1e-05,
+        "generator_warmup_iters": 300,
+        "generator_lr_decay_iters": 171662,
+        "beta_1": 0.9,
+        "codec_beta_2": 0.99,
+        "generator_beta_2": 0.99,
+        "weight_decay": 0.1,
+        "max_grad_norm": 1.0,
+        "level_loss_alpha": 1.0,
+        "grad_accumulation_steps": 12,
+        "corruption": {
+          "mode": "per_level",
+          "per_level_probs": [
+            0.85,
+            0.8321428571,
+            0.8142857143,
+            0.7964285714,
+            0.7785714286,
+            0.7607142857,
+            0.7428571429,
+            0.725,
+            0.7071428571,
+            0.6892857143,
+            0.6714285714,
+            0.6535714286,
+            0.6357142857,
+            0.6178571429,
+            0.6
+          ],
+          "skip_level0": true
+        }
+      },
+      "training": {
+        "log_interval": 10,
+        "eval_interval": 1000,
+        "checkpoint_interval": 1000,
+        "eval_batch_size": 4,
+        "val_iters": 25,
+        "keep_last": 3,
+        "seed": 55,
+        "codec_initialization_seed": 42,
+        "generator_initialization_seed": 55,
+        "total_iters": 171662,
+        "batch_size": 32,
+        "expected_world_size": 8,
+        "expected_global_batch_size": 3072,
+        "resume_checkpoint": null,
+        "milestone_steps": [
+          1272,
+          6358,
+          10000,
+          17167
+        ],
+        "generation_eval_steps": [
+          10000,
+          17167
+        ]
+      },
+      "torch_compile": {
+        "enable": true,
+        "scope": "loss",
+        "mode": "default",
+        "dynamic": false,
+        "fullgraph": true,
+        "backend": "inductor"
+      },
+      "mixed_precision": {
+        "enable": true
+      },
+      "wandb": {
+        "entity": "mstok",
+        "project": "iclr-debug",
+        "group": "full-owt-ctx256-16sq-135b-v1",
+        "enable": true,
+        "id": "iclr-debug-ablation-no-semantic-13p5b-v1-decoder-mstok",
+        "resume": "allow",
+        "gradients_and_params": {
+          "enable": false,
+          "log": "all",
+          "log_freq": 1000
+        }
+      },
+      "export": {
+        "vqvae_config_template": "/home/ubuntu/mstok-runs/iclr-debug-no-semantic-20260919/config/repro-ctx256/vqvae.yaml",
+        "ncp_config_template": "/home/ubuntu/mstok-runs/iclr-debug-no-semantic-20260919/config/repro-ctx256/ncp-sharedhead.yaml"
+      },
+      "semantic": {
+        "enabled": true,
+        "mode": "eostok",
+        "weight": 0.0,
+        "warmup_steps": 500,
+        "teacher_id": "FacebookAI/roberta-base",
+        "teacher_revision": "e2da8e2f811d1448a5b465c236feacd80ffbac7b",
+        "tokenizer_revision": "607a30d783dfa663caf39e06633721c8d4cfcd7e",
+        "teacher_dim": 768,
+        "feature_layer": 6,
+        "projector_dim": 2048,
+        "projector_seed": 56,
+        "alignment_site": "decoder"
+      },
+      "iclr_debug": {
+        "stage": "decoder-mstok",
+        "target_positions": 135000000000,
+        "lr_horizon_positions": 135000000000,
+        "stop_step": 17167,
+        "pilot": false,
+        "tokenizer_checkpoint": null,
+        "tokenizer_steps": null,
+        "budget_unit": "input positions including padding; log non-padding tokens separately",
+        "ablation": "no-semantic"
+      }
+    }
+  },
+  "sources": {
+    "config/repro-ctx256/alignment-generator.yaml": "f62f36d078a3a373a19ea716a3ebc7eda5ae2fb7d670c5b935c734826bb76895",
+    "config/repro-ctx256/alignment-joint.yaml": "bb511950d20335e4237e406464ab26760a7fd9c9c9472c0507addd88d33d5178",
+    "config/repro-ctx256/alignment-tokenizer.yaml": "2d32955296f7d15990f284328c1cf8f52071abdba28033a65e272bb49cf5dd56",
+    "config/repro-ctx256/alignment.yaml": "3a486fa2ed28eca4fc406232669399b0625d274376ac43271f4ccf187b1e9077",
+    "config/repro-ctx256/joint.yaml": "8b4889111687a52e2d7d71995bda45a7f01f2777674c88191f338dca4c1732d2",
+    "config/repro-ctx256/mstok-semantic-eostok-matched10ep.yaml": "ae8a72c0c9f1cb5d2e301d83a1cdc08985a1f895bf627a5f75b1b3ce627f5e58",
+    "config/repro-ctx256/mstok-semantic-eostok.yaml": "2c9c48b21325c0e479990701b28116d78f611101724846747d173e52145fe15a",
+    "config/repro-ctx256/mstok-semantic-gear-matched10ep.yaml": "164cb8ac39fa407bb337f559ad8a9c62a34708fb900b8829d3ccf182961f2d0c",
+    "config/repro-ctx256/mstok-semantic-gear.yaml": "8cb8c998551daef0bf7fd9ec77b13b34c06662028d8820767e1432b5a9e8be54",
+    "config/repro-ctx256/mstok-semantic.yaml": "e0b00dbfa3eb838103f657c19bde20e36375c7fbe692623452ea093003f1ac98",
+    "config/repro-ctx256/mstok-w1-pilot.yaml": "21ee22eeccaaea2563c92ccc84f6df3871ea5da6a5ce980656088ea577dc1438",
+    "config/repro-ctx256/mstok-w1.yaml": "b6bf6079114b3c997fab89e85a53318bb2ec5dae55678513599d84152eab701b",
+    "config/repro-ctx256/mstok.yaml": "d9bb216f4eeb58857d72be399d5f8847d197ce70d0e504879f0788045483dc87",
+    "config/repro-ctx256/ncp-sharedhead.yaml": "86c9efbcb2b4f74b7253aa3bc4393de4a6a05e20ea30da573d1ca094ec600645",
+    "config/repro-ctx256/ncp.yaml": "93663654c4ce5ad0931db052edf507fdcb7c0ff9fc9722f4018820deee5c5acf",
+    "config/repro-ctx256/substitution-generator.yaml": "064f55887b9b2b8f3b0b52c094d4a193510dc1148ad7a5c7f53e317971f87c7c",
+    "config/repro-ctx256/substitution-joint.yaml": "b1576f4ecfe6fc6029a0cd868271b80a1d988b7f3667c6b1a8d24a6a4015df3b",
+    "config/repro-ctx256/substitution-tokenizer.yaml": "e29be5046f0fafbfe4c06973be4cd036a004e845348911cc0e6e05a7fca5d425",
+    "config/repro-ctx256/substitution.yaml": "ebba1c7e664de0e84913bdfd38e794837781c42c1b48cde90135ff9417856a95",
+    "config/repro-ctx256/vqvae.yaml": "05fde46e57c3e6b411e8a6afcac251f178e4b8a0856a0b99332bb284fb4710ce",
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+}

ablations/iclr-debug-ablation-no-semantic-13p5b-v1/pilot-qualification.json

@@ -0,0 +1,20 @@
+{
+  "passed": true,
+  "checked_utc": "2026-09-19T01:21:59.185135+00:00",
+  "ablation": "no-semantic",
+  "world_size": 8,
+  "global_batch": 3072,
+  "compile_fullgraph": true,
+  "save_resume_steps": [
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+    32
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+  "auxiliary_levels_warmed": 15,
+  "optimizer_state_finite": true,
+  "model_weights_finite": true,
+  "expected_attention_mask_negative_infinity": true,
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+  "last_interval_raw_tokens_per_second": 153754.97779476875,
+  "note": "Pilot covers all 15 target levels via deterministic cycling. Throughput from its final interval is a short estimate; production random-level throughput is checked separately."
+}

ablations/iclr-debug-ablation-no-semantic-13p5b-v1/test-results.json

@@ -0,0 +1,9 @@
+{
+  "commit": "dcdf3361ed8dce2d2662dc971ef7d112cf2b1810",
+  "checked_utc": "2026-09-19T01:14:31.165610+00:00",
+  "cpu_passed": 81,
+  "cpu_skipped": 3,
+  "cpu_skips": "Opt-in GPU checks; no-semantic separately executed on GPU",
+  "cuda_inductor_no_semantic_gradient_parity_passed": 1,
+  "teacher_cache_verified": true
+}