V19-cognitive-engine

V19 White-box Chinese Cognition Engine

Model Summary

V19 is a fully interpretable Chinese language understanding system with 4.7 million parameters. It reads a Chinese sentence as a sequence of characters, builds word-level representations through a frozen char-to-word encoder (P1), routes information across sentences (P7), and decodes back to word sequences (P6) — all while maintaining traceable, auditable intermediate states.

Unlike transformer-based LLMs, every internal decision in V19 can be inspected:

• P1: Which words each character pair maps to
• P7: How words route across sentences (32-head attention with per-head gating)
• Explore+Meta Gate: Which decoding dimensions are active and why
• P6: How each output word is decoded from the sentence vector + position embedding

Intended Use

• Chinese text correction (primary task)
• Interpretability research: study how linguistic attributes compose without black boxes
• Education: demonstrate NLP concepts with fully transparent architecture
• Low-resource deployment: 141MB GPU, runs on CPU at 71 sent/s

Architecture

P1 (Char→Word, 96K frozen) → P7 (Router, 226K) → Explore+Meta (Gate, 101K) → P6 (Decoder, 4.37M)

P1: Char→Word Encoder (frozen)

• Input: 2 consecutive characters
• Output: 128-dimensional word vector
• Cross-attention over 6,000-word vocabulary
• Batch encoding (50 words/batch) to control GPU memory

P7: Cross-sentence Router

• 32 heads × 4 dimensions
• P5-style ±superposition for sent_vec (learnable positional weights, not mean pooling)
• Output: 256D sentence vector

Explore + Meta Gate

• 12D loss vector → Explore network (128→256→256→tanh) → 256D control signal
• Meta: sigmoid(bias + signal) → 256D gate
• Gate modulates P6 encoder output dimension-wise
• Learns when to open/close dimensions without direct loss minimization

P6: Sentence → Word Decoder (Position Embedding V6)

• Encoder: 256→256→256 (GELU)
• 128 independent extraction heads, each: h * gate + pos_embed[i] → Linear(256,128) → word_i
• Position embedding provides unique starting point per head — naturally prevents repetition collapse
• No rep_pen, no residual subtraction, no detach needed

Training

Evaluation

V18 (875K params, 16 heads)

V19 (4.7M params, 128 heads) — in training

Key Innovations

Position Embedding V6 (Anti-collapse)

After 5 failed approaches to prevent the P6 decoder from outputting the same word repeatedly (rep_pen, residual extraction, weight transpose inversion, orthogonal init, cos_loss margin), the final solution was the simplest:

for i in range(max_words):
    hi = h + self.pos_embed[i]  # unique starting point per head
    w = self.extract[i](hi)

No rep_pen. No residuals. No detach. Just position diversity.

Explore→Meta Gate

Instead of directly minimizing loss (which causes gates to converge to all-open or all-closed), the gate is trained indirectly:

1. Loss flows into Explore network → produces 256D signal
2. Meta applies learned bias + sigmoid → 256D gate
3. Gate modulates P6 encoder → affects word predictions
4. Gate quality is measured by per-head prediction accuracy, not total loss

This prevents the "gate symmetry lock" (all dims identical, std=0.0001) that plagued early versions.

Data

After sentence splitting: 52,387 pairs
Split: train 41,909 (80%) / test 5,238 (10%) / exam 5,240 (10%)

Limitations

• Chinese only: Character set limited to 6,164 unique characters from training data
• Sentence length: Max 128 characters (configurable, but untested beyond)
• No multilingual support: Architecture assumes CJK character structure
• Training data bias: Primarily news/law/medical domains from text correction dataset
• V19 training incomplete: 1000-epoch training in progress; current model may be suboptimal

Citation

@misc{wei2026v19,
  title={V19: A White-box Chinese Cognition Engine},
  author={Wei, Jinqi},
  year={2026},
  howpublished={\url{https://github.com/Xuan-yi-yan/V18-cognitive-architecture}},
}

Contact

GitHub: @Xuan-yi-yan