GLM-5.3-0.6B-A0.4B

GLM-5.3-0.6B-A0.4B

This is a tiny version of zai-org/GLM-5.3 created for testing and development.

Model Details

• Base Model: zai-org/GLM-5.3
• Architecture: glm_moe_dsa (GLM MoE with DeepSeek Sparse Attention)
• Total Parameters: 0.62B
• Activated Parameters: ~0.43B

This tiny model preserves the full GLM-5.3 architecture: Multi-head Latent Attention (MLA) with low-rank Q/KV projections, the DeepSeek Sparse Attention (DSA) lightning indexer, a mix of dense and MoE (sparse) MLP layers, routed experts with a sigmoid gate and e_score_correction_bias, and a shared expert. Both full and shared indexer types are represented.

Configuration Changes

The following parameters were reduced from the original model:

MLA head dimensions (qk_nope_head_dim=192, qk_rope_head_dim=64, v_head_dim=256, head_dim=64) and the indexer index_head_dim/index_topk are kept identical to the base model to preserve the attention structure.

Checkpoint Structure

Single-shard safetensors checkpoint (model.safetensors). The tensor naming is analogous to the original GLM-5.3 checkpoint (model.embed_tokens, lm_head, MLA projections q_a_proj/q_b_proj/kv_a_proj_with_mqa/kv_b_proj, the DSA self_attn.indexer.* tensors, per-expert mlp.experts.N.{gate,up,down}_proj, mlp.shared_experts.*, and the mlp.gate router). Two expected differences: this model is stored in bfloat16 rather than FP8, so it has no weight_scale_inv scale tensors; and the multi-token-prediction (MTP) layer is omitted (num_nextn_predict_layers=0), so it has no eh_proj/enorm/hnorm/ shared_head tensors.

Usage

from transformers import AutoModelForCausalLM, AutoTokenizer

model = AutoModelForCausalLM.from_pretrained("GLM-5.3-0.6B-A0.4B", device_map="auto")
tokenizer = AutoTokenizer.from_pretrained("GLM-5.3-0.6B-A0.4B")

input_ids = tokenizer("According to all known laws", return_tensors="pt").input_ids.to(model.device)
output = model.generate(input_ids, max_new_tokens=20)
print(tokenizer.decode(output[0]))

Creation Process

This model was created using the llm-compressor create-tiny-model claude skill.

1. Inspected the glm_moe_dsa config to identify the layer/expert/attention controls.
2. Reduced layer count, hidden/FFN sizes, expert count, and attention/indexer heads to reach ~0.6B parameters while keeping at least one dense and one MoE layer and both indexer types. Weights were randomly initialized (with a fixup pass for norms/biases).
3. Fine-tuned on a small toy text dataset until perplexity converged well below target.
4. Verified the checkpoint tensor structure matches the base model (aside from FP8 scales and the MTP layer).
5. Validated loading, perplexity, and generation.

Notes

• Stored in bfloat16 (the base model ships FP8-quantized weights).
• The MTP layer is intentionally omitted.
• Validation output:

Success: 1.0138424634933472 <= 10.0

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Generating sample text:
According to all known laws of aviation, there is no way a bee should be able to fly.
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