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API reference

This page covers the stable research-facing surface. The source remains the authority for experimental fields.

Top-level imports

from complexity import ComplexityModel, ModelConfig

The package also exports:

  • component registries and registration decorators;
  • GQA, MHA, and MQA classes;
  • dense and token-routed MLP classes;
  • normalization and position-embedding components.

ModelConfig

Model shape

Field Meaning
hidden_size residual width
num_hidden_layers decoder depth
intermediate_size routed expert pool width or dense FFN width
vocab_size tokenizer vocabulary
max_position_embeddings configured context bound

Attention

Field Meaning
attention_type registry key such as gqa, mha, tr_mha_v2
num_attention_heads query head count
num_key_value_heads K/V head count
use_qk_norm Q/K RMS normalization
use_sdpa PyTorch SDPA path
sliding_window optional local-attention window

TR-MoE

Field Meaning
mlp_type set token_routed for TR-MoE
num_experts routed expert count
routing_strategy lexical or experimental LSH route
shared_expert enable dense shared SwiGLU
shared_intermediate_size shared branch width
shared_expert_chunk_tokens chunk shared computation over tokens
top_k number of deterministic expert routes
top_k_primary_weight blend assigned to primary route
use_shared_routed_gates learn shared/routed scalar gates
collect_moe_telemetry collect route/RMS diagnostics
use_custom_kernels custom-kernel policy
use_cggr grouped-GEMM policy

Configuration validates shape, routing, and range invariants in ModelConfig.__post_init__.

ComplexityModel

Construct

model = ComplexityModel(config)
model = ComplexityModel.from_config("config.yaml")
model = ComplexityModel.from_pretrained("checkpoint-directory")

Forward

result = model(
    input_ids,
    attention_mask=None,
    past_key_values=None,
    use_cache=False,
    return_hidden_states=False,
    return_logits=True,
)

Return mapping:

Key Value
logits [batch, sequence, vocabulary], or None
last_hidden_state final normalized hidden states
past_key_values optional per-layer cache/state list
hidden_states optional embedding and layer states

Set return_logits=False for fused or chunked tied-head loss paths.

Save and load

model.save_pretrained("checkpoint")
restored = ComplexityModel.from_pretrained("checkpoint")

For distributed DTensor/FSDP saves, every rank must enter save_pretrained because full-tensor gathering is collective.

Generation

model.generate() intentionally raises RuntimeError. Use the external serving client.

External inference

from complexity.inference import (
    ExternalGenerationConfig,
    OpenAICompatibleBackend,
    create_external_backend,
)

create_external_backend accepts "vllm" or "sglang" and calls /v1/completions or /v1/chat/completions.

backend = create_external_backend(
    "vllm",
    base_url="http://localhost:8000",
    model="tr-gqa",
)
answer = backend.chat(
    [{"role": "user", "content": "Summarize the experiment."}],
    ExternalGenerationConfig(max_tokens=128),
)

The client is synchronous and non-streaming in the current implementation.

Component registries

from complexity.core.registry import (
    ATTENTION_REGISTRY,
    MLP_REGISTRY,
    NORMALIZATION_REGISTRY,
    POSITION_REGISTRY,
    register_attention,
    register_mlp,
)

Principal attention keys:

gqa, mha, mqa
tr_mha, tr_mha_v2
lexical_gqa, lexical_key_gqa
causal_conv, causal_state_conv, causal_fast_weight_conv

Principal MLP keys:

tr_hash_engine, tr_hash_moe
dense_deterministic
lexical_modulated, lexical_channel_modulated, lexical_object_micro_expert

swiglu/gelu/geglu/standard/mixtral/token_routed were removed — constructing a config with any of them raises a clear error pointing at the replacement (see token-routed.md for token_routed checkpoints specifically).

Several aliases exist for checkpoint compatibility. New documentation should use the principal key.

Direct TR-MoE module

from complexity.core.mlp import MLPConfig, TRHashEngineMLP

layer = TRHashEngineMLP(
    MLPConfig(
        hidden_size=384,
        intermediate_size=128,
        vocab_size=32_000,
        num_experts=4,
        shared_expert=True,
        shared_intermediate_size=1536,
        top_k=2,
    )
)
output = layer(hidden_states, token_ids=input_ids)

Useful diagnostics:

layer.engine.last_backend
layer.capability_summary()
layer.training_telemetry()

Official MCP client

Install:

pip install -e ".[tools]"

Imports:

from complexity.mcp import (
    MCPTool,
    MCPToolResult,
    OfficialMCPStdioClient,
    OfficialMCPStdioConfig,
)

The wrapper launches and calls an MCP server through the official Python SDK stdio transport. It does not reimplement tools.

CLI entry points

complexity
cf-plan-run
cf-plan-cluster

cf-o200k-pretrain and cf-check-pipeline were removed along with the o200k training pipeline (see training.md). cf-plan-run and cf-plan-cluster remain for token-budget and cluster-sizing arithmetic. Some older complexity subcommands remain experimental.