Files
mlx-lm/mlx_lm/models/deepseek_v32.py
T
Gökdeniz Gülmez 1974376d70 Add GLM5 (#867)
* Add GLM4 MoE DSA model implementation with configurable parameters

* Update Acknowledgments to include GLM4 MoE DSA support

* format

* update ackn.

* Fixes

* Update acknowledgments to include contributions for GLM MoE DSA and additional architectures

* use dsv32 for glm5

* fix

* Fix rope theta

---------

Co-authored-by: Tarjei Mandt <kernelpool@gmail.com>
Co-authored-by: Awni Hannun <awni@apple.com>
2026-02-12 10:11:16 -08:00

658 lines
24 KiB
Python

# Copyright © 2025 Apple Inc.
import math
from dataclasses import dataclass
from typing import Any, Dict, Optional
import mlx.core as mx
import mlx.nn as nn
from mlx.nn.layers.distributed import shard_inplace, shard_linear, sum_gradients
from .activations import swiglu
from .base import BaseModelArgs, create_attention_mask, scaled_dot_product_attention
from .cache import CacheList, KVCache
from .mla import MultiLinear
from .rope_utils import initialize_rope
from .switch_layers import SwitchGLU
@dataclass
class ModelArgs(BaseModelArgs):
model_type: str = "deepseek_v32"
vocab_size: int = 102400
hidden_size: int = 4096
index_head_dim: int = 128
index_n_heads: int = 64
index_topk: int = 2048
intermediate_size: int = 11008
moe_intermediate_size: int = 1407
num_hidden_layers: int = 30
num_attention_heads: int = 32
num_key_value_heads: int = 32
n_shared_experts: Optional[int] = None
n_routed_experts: Optional[int] = None
routed_scaling_factor: float = 1.0
kv_lora_rank: int = 512
q_lora_rank: int = 1536
qk_rope_head_dim: int = 64
v_head_dim: int = 128
qk_nope_head_dim: int = 128
topk_method: str = "noaux_tc"
scoring_func: str = "sigmoid"
norm_topk_prob: bool = True
n_group: int = 1
topk_group: int = 1
num_experts_per_tok: int = 1
moe_layer_freq: int = 1
first_k_dense_replace: int = 0
max_position_embeddings: int = 2048
rms_norm_eps: float = 1e-6
rope_theta: float = 10000.0
rope_scaling: Dict = None
attention_bias: bool = False
class Indexer(nn.Module):
def __init__(self, args: ModelArgs):
super().__init__()
self.dim = args.hidden_size
self.n_heads = args.index_n_heads
self.head_dim = args.index_head_dim
self.rope_head_dim = args.qk_rope_head_dim
self.index_topk = args.index_topk
self.q_lora_rank = args.q_lora_rank
self.wq_b = nn.Linear(
self.q_lora_rank, self.n_heads * self.head_dim, bias=False
)
self.wk = nn.Linear(self.dim, self.head_dim, bias=False)
self.k_norm = nn.LayerNorm(self.head_dim)
self.weights_proj = nn.Linear(self.dim, self.n_heads, bias=False)
self.softmax_scale = self.head_dim**-0.5
self.rope = initialize_rope(
dims=args.qk_rope_head_dim,
base=args.rope_theta,
traditional=True,
max_position_embeddings=args.max_position_embeddings,
scaling_config=args.rope_scaling,
)
def __call__(
self,
x: mx.array,
qr: mx.array,
mask: Optional[mx.array],
cache: Optional[Any] = None,
):
# Computes top_k indices for attention
b, s, _ = x.shape
q = self.wq_b(qr)
q = q.reshape(b, s, self.n_heads, self.head_dim).swapaxes(1, 2)
q_pe, q_nope = mx.split(q, [self.rope_head_dim], axis=-1)
offset = cache.offset if cache is not None else 0
q_pe = self.rope(q_pe, offset=offset)
q = mx.concatenate([q_pe, q_nope], axis=-1)
k = self.wk(x)
k = self.k_norm(k)
k = mx.reshape(k, (b, 1, s, self.head_dim))
k_pe, k_nope = mx.split(k, [self.rope_head_dim], axis=-1)
k_pe = self.rope(k_pe, offset=offset)
k = mx.concatenate([k_pe, k_nope], axis=-1)
if cache is not None:
k, _ = cache.update_and_fetch(k, mx.zeros([b, 1, s, 0]))
if k.shape[2] <= self.index_topk:
return None
scores = q @ k.swapaxes(-1, -2)
scores = mx.maximum(scores, 0)
weights = self.weights_proj(x) * (self.n_heads**-0.5 * self.softmax_scale)
weights = weights.swapaxes(-1, -2)[..., None]
scores = scores * weights
scores = scores.sum(axis=1, keepdims=True)
if mask is not None:
scores = mx.where(mask, scores, -float("inf"))
return mx.argpartition(scores, kth=-self.index_topk, axis=-1)[
..., -self.index_topk :
]
class DeepseekV32Attention(nn.Module):
def __init__(self, config: ModelArgs):
super().__init__()
self.config = config
self.hidden_size = config.hidden_size
self.num_heads = config.num_attention_heads
self.max_position_embeddings = config.max_position_embeddings
self.rope_theta = config.rope_theta
self.q_lora_rank = config.q_lora_rank
self.qk_rope_head_dim = config.qk_rope_head_dim
self.kv_lora_rank = config.kv_lora_rank
self.v_head_dim = config.v_head_dim
self.qk_nope_head_dim = config.qk_nope_head_dim
self.q_head_dim = config.qk_nope_head_dim + config.qk_rope_head_dim
self.scale = self.q_head_dim**-0.5
self.q_a_proj = nn.Linear(
self.hidden_size, self.q_lora_rank, bias=config.attention_bias
)
self.q_a_layernorm = nn.RMSNorm(self.q_lora_rank, eps=1e-6)
self.q_b_proj = nn.Linear(
self.q_lora_rank, self.num_heads * self.q_head_dim, bias=False
)
self.kv_a_proj_with_mqa = nn.Linear(
self.hidden_size,
self.kv_lora_rank + self.qk_rope_head_dim,
bias=config.attention_bias,
)
self.kv_a_layernorm = nn.RMSNorm(self.kv_lora_rank, eps=1e-6)
self.embed_q = MultiLinear(
self.qk_nope_head_dim, self.kv_lora_rank, self.num_heads
)
self.unembed_out = MultiLinear(
self.kv_lora_rank, self.v_head_dim, self.num_heads
)
self.o_proj = nn.Linear(
self.num_heads * self.v_head_dim,
self.hidden_size,
bias=config.attention_bias,
)
if self.config.rope_scaling is not None:
mscale_all_dim = self.config.rope_scaling.get("mscale_all_dim", 0)
if mscale_all_dim:
scaling_factor = self.config.rope_scaling["factor"]
if scaling_factor > 1:
s = 0.1 * mscale_all_dim * math.log(scaling_factor) + 1.0
self.scale = self.scale * s * s
self.indexer = Indexer(config)
self.rope = initialize_rope(
dims=self.qk_rope_head_dim,
base=self.rope_theta,
traditional=True,
max_position_embeddings=self.max_position_embeddings,
scaling_config=self.config.rope_scaling,
)
def __call__(
self,
x: mx.array,
mask: Optional[mx.array] = None,
cache: Optional[Any] = None,
) -> mx.array:
B, L, D = x.shape
qr = self.q_a_layernorm(self.q_a_proj(x))
q = self.q_b_proj(qr)
q = q.reshape(B, L, self.num_heads, self.q_head_dim).transpose(0, 2, 1, 3)
q_nope, q_pe = mx.split(q, [self.qk_nope_head_dim], axis=-1)
compressed_kv = self.kv_a_proj_with_mqa(x)
compressed_kv, k_pe = mx.split(compressed_kv, [self.kv_lora_rank], axis=-1)
k_pe = k_pe.reshape(B, L, 1, self.qk_rope_head_dim).transpose(0, 2, 1, 3)
kv_latent = self.kv_a_layernorm(compressed_kv)
offset = cache[0].offset if cache is not None else 0
q_pe = self.rope(q_pe, offset)
k_pe = self.rope(k_pe, offset)
kv_latent = mx.expand_dims(kv_latent, axis=1)
if cache is not None:
kv_latent, k_pe = cache[0].update_and_fetch(kv_latent, k_pe)
else:
cache = [None] * 2
topk_indices = self.indexer(x, qr, mask, cache=cache[1])
if topk_indices is not None:
if L == 1:
idx = topk_indices[:, :, 0, :, None]
kv_latent = mx.take_along_axis(
kv_latent,
mx.broadcast_to(idx, idx.shape[:-1] + (kv_latent.shape[-1],)),
axis=2,
)
k_pe = mx.take_along_axis(
k_pe,
mx.broadcast_to(idx, idx.shape[:-1] + (k_pe.shape[-1],)),
axis=2,
)
mask = None
else:
shape = list(topk_indices.shape)
shape[-1] = kv_latent.shape[2]
sparse_mask = mx.zeros(shape, dtype=mx.bool_)
sparse_mask = mx.put_along_axis(
sparse_mask, topk_indices, mx.array(True), axis=-1
)
if mask is not None:
sparse_mask = sparse_mask & mask
mask = sparse_mask
# Ensure the indexer cache is evaluated even if the topk_indices are unused
# to keep the graph from getting too large
if cache is not None and cache[0] is not None:
cache[0].keys = mx.depends(cache[0].keys, (cache[1].keys, cache[1].values))
pe_scores = (q_pe * self.scale) @ k_pe.swapaxes(-1, -2)
if mask is not None:
pe_scores = mx.where(
mask,
pe_scores,
mx.array(mx.finfo(pe_scores.dtype).min, pe_scores.dtype),
)
if L == 1:
q_nope = self.embed_q(q_nope)
k = v = kv_latent
else:
k = self.embed_q(kv_latent, transpose=False)
v = self.unembed_out(kv_latent)
output = scaled_dot_product_attention(
q_nope, k, v, cache=cache, scale=self.scale, mask=pe_scores
)
if L == 1:
output = self.unembed_out(output)
output = output.transpose(0, 2, 1, 3).reshape(B, L, -1)
return self.o_proj(output)
class DeepseekV32MLP(nn.Module):
def __init__(
self, config: ModelArgs, hidden_size: int = None, intermediate_size: int = None
):
super().__init__()
self.config = config
self.hidden_size = config.hidden_size if hidden_size is None else hidden_size
self.intermediate_size = (
config.intermediate_size if intermediate_size is None else intermediate_size
)
self.gate_proj = nn.Linear(self.hidden_size, self.intermediate_size, bias=False)
self.up_proj = nn.Linear(self.hidden_size, self.intermediate_size, bias=False)
self.down_proj = nn.Linear(self.intermediate_size, self.hidden_size, bias=False)
def __call__(self, x):
down_proj = self.down_proj(swiglu(self.gate_proj(x), self.up_proj(x)))
return down_proj
@mx.compile
def group_expert_select(
gates,
e_score_correction_bias,
top_k,
n_group,
topk_group,
routed_scaling_factor,
norm_topk_prob,
):
scores = mx.sigmoid(gates.astype(mx.float32))
orig_scores = scores
scores = scores + e_score_correction_bias
if n_group > 1:
scores = mx.unflatten(scores, axis=-1, shape=(n_group, -1))
group_scores = mx.topk(scores, 2, axis=-1).sum(axis=-1, keepdims=True)
k = n_group - topk_group
group_idx = mx.argpartition(group_scores, kth=k - 1, axis=-2)[..., :k, :]
scores = mx.put_along_axis(
scores, mx.stop_gradient(group_idx), mx.array(0.0), axis=-2
)
scores = mx.flatten(scores, -2, -1)
k = top_k
inds = mx.argpartition(-scores, kth=k - 1, axis=-1)[..., :k]
scores = mx.take_along_axis(orig_scores, inds, axis=-1)
if top_k > 1 and norm_topk_prob:
denominator = scores.sum(axis=-1, keepdims=True)
scores = scores / denominator
scores = scores * routed_scaling_factor
return inds, scores
class MoEGate(nn.Module):
def __init__(self, config: ModelArgs):
super().__init__()
self.config = config
self.top_k = config.num_experts_per_tok
self.norm_topk_prob = config.norm_topk_prob
self.n_routed_experts = config.n_routed_experts
self.routed_scaling_factor = config.routed_scaling_factor
self.n_group = config.n_group
self.topk_group = config.topk_group
self.weight = mx.zeros((self.n_routed_experts, config.hidden_size))
self.e_score_correction_bias = mx.zeros((self.n_routed_experts,))
assert config.topk_method == "noaux_tc", "Unsupported topk method."
def __call__(self, x):
return group_expert_select(
x @ self.weight.T,
self.e_score_correction_bias,
self.top_k,
self.n_group,
self.topk_group,
self.routed_scaling_factor,
self.norm_topk_prob,
)
class DeepseekV32MoE(nn.Module):
def __init__(self, config: ModelArgs):
super().__init__()
self.config = config
self.num_experts_per_tok = config.num_experts_per_tok
self.switch_mlp = SwitchGLU(
config.hidden_size,
config.moe_intermediate_size,
config.n_routed_experts,
)
self.gate = MoEGate(config)
if config.n_shared_experts is not None:
intermediate_size = config.moe_intermediate_size * config.n_shared_experts
self.shared_experts = DeepseekV32MLP(
config=config, intermediate_size=intermediate_size
)
self.sharding_group = None
def __call__(self, x):
if self.sharding_group is not None:
x = sum_gradients(self.sharding_group)(x)
inds, scores = self.gate(x)
y = self.switch_mlp(x, inds)
y = (y * scores[..., None]).sum(axis=-2).astype(y.dtype)
if self.config.n_shared_experts is not None:
y = y + self.shared_experts(x)
if self.sharding_group is not None:
y = mx.distributed.all_sum(y, group=self.sharding_group)
return y
class DeepseekV32DecoderLayer(nn.Module):
def __init__(self, config: ModelArgs, layer_idx: int):
super().__init__()
self.self_attn = DeepseekV32Attention(config)
self.mlp = (
DeepseekV32MoE(config)
if (
config.n_routed_experts is not None
and layer_idx >= config.first_k_dense_replace
and layer_idx % config.moe_layer_freq == 0
)
else DeepseekV32MLP(config)
)
self.input_layernorm = nn.RMSNorm(config.hidden_size, eps=config.rms_norm_eps)
self.post_attention_layernorm = nn.RMSNorm(
config.hidden_size, eps=config.rms_norm_eps
)
def __call__(
self,
x: mx.array,
mask: Optional[mx.array] = None,
cache: Optional[Any] = None,
) -> mx.array:
r = self.self_attn(self.input_layernorm(x), mask, cache)
h = x + r
r = self.mlp(self.post_attention_layernorm(h))
return h + r
class DeepseekV32Model(nn.Module):
def __init__(self, config: ModelArgs):
super().__init__()
self.vocab_size = config.vocab_size
self.embed_tokens = nn.Embedding(config.vocab_size, config.hidden_size)
self.layers = [
DeepseekV32DecoderLayer(config, idx)
for idx in range(config.num_hidden_layers)
]
self.start_idx = 0
self.end_idx = len(self.layers)
self.num_layers = self.end_idx
self.norm = nn.RMSNorm(config.hidden_size, eps=config.rms_norm_eps)
self.pipeline_rank = 0
self.pipeline_size = 1
def pipeline(self, group):
# Split layers in reverse so rank=0 gets the last layers and
# rank=pipeline_size-1 gets the first
self.pipeline_rank = group.rank()
self.pipeline_size = group.size()
layers_per_rank = len(self.layers) // self.pipeline_size
extra = len(self.layers) - layers_per_rank * self.pipeline_size
if self.pipeline_rank < extra:
layers_per_rank += 1
self.start_idx = (self.pipeline_size - self.pipeline_rank - 1) * layers_per_rank
self.end_idx = self.start_idx + layers_per_rank
self.layers = self.layers[: self.end_idx]
self.layers[: self.start_idx] = [None] * self.start_idx
self.num_layers = len(self.layers) - self.start_idx
def __call__(
self,
x: mx.array,
cache: Optional[Any] = None,
) -> mx.array:
h = self.embed_tokens(x)
pipeline_rank = self.pipeline_rank
pipeline_size = self.pipeline_size
if cache is None:
cache = [None] * self.num_layers
mask = create_attention_mask(
h, cache[0][0] if cache[0] else None, return_array=True
)
# Receive from the previous process in the pipeline
if pipeline_rank < pipeline_size - 1:
h = mx.distributed.recv_like(h, (pipeline_rank + 1))
for i in range(self.num_layers):
h = self.layers[self.start_idx + i](h, mask, cache[i])
# Send to the next process in the pipeline
if pipeline_rank != 0:
h = mx.distributed.send(h, (pipeline_rank - 1) % pipeline_size)
if cache[-1] is not None:
cache[-1][0].keys = mx.depends(cache[-1][0].keys, h)
# Broadcast h while keeping it in the graph
if pipeline_size > 1:
h = mx.distributed.all_gather(h)[: h.shape[0]]
return self.norm(h)
class Model(nn.Module):
def __init__(self, config: ModelArgs):
super().__init__()
self.args = config
self.model_type = config.model_type
self.model = DeepseekV32Model(config)
self.lm_head = nn.Linear(config.hidden_size, config.vocab_size, bias=False)
def __call__(
self,
inputs: mx.array,
cache: Optional[Any] = None,
):
out = self.model(inputs, cache)
return self.lm_head(out)
def sanitize(self, weights):
# Remove multi-token prediction layers
mpt_layer = self.args.num_hidden_layers
new_weights = {}
for k, v in weights.items():
parts = k.split(".")
if len(parts) >= 3 and parts[1] == "layers" and int(parts[2]) >= mpt_layer:
continue
new_weights[k] = v
weights = new_weights
def dequant(weight, scale_inv):
dtype = mx.bfloat16
weight = mx.from_fp8(weight, dtype=mx.bfloat16)
bs = 128 # block size
m, n = weight.shape
pad_bottom = (-m) % bs
pad_side = (-n) % bs
weight = mx.pad(weight, ((0, pad_bottom), (0, pad_side)))
weight = weight.reshape(
((m + pad_bottom) // bs, bs, (n + pad_side) // bs, bs)
)
weight = (weight * scale_inv[:, None, :, None]).reshape(
m + pad_bottom, n + pad_side
)
return weight[:m, :n].astype(dtype)
# Dequantize
new_weights = {}
for k, v in weights.items():
if "weight_scale_inv" in k:
scale_inv = v
wk = k.replace("_scale_inv", "")
weight = weights[wk]
weight = dequant(weight, scale_inv)
new_weights[wk] = weight
elif k not in new_weights:
new_weights[k] = v
weights = new_weights
# Stack experts
for l in range(self.args.num_hidden_layers):
prefix = f"model.layers.{l}"
for n, m in [("w1", "gate_proj"), ("w2", "down_proj"), ("w3", "up_proj")]:
for k in ["weight", "scales", "biases"]:
if f"{prefix}.mlp.experts.0.{m}.{k}" in weights:
to_join = [
weights.pop(f"{prefix}.mlp.experts.{e}.{m}.{k}")
for e in range(self.args.n_routed_experts)
]
weights[f"{prefix}.mlp.switch_mlp.{m}.{k}"] = mx.stack(to_join)
prefix = f"model.layers.{l}.self_attn"
if f"{prefix}.kv_b_proj.weight" in weights:
layer = self.model.layers[l].self_attn.embed_q
quantized = f"{prefix}.kv_b_proj.scales" in weights
v = weights.pop(f"{prefix}.kv_b_proj.weight")
head_dim = self.args.qk_nope_head_dim + self.args.v_head_dim
if quantized:
dims = self.args.kv_lora_rank
scales = weights.pop(f"{prefix}.kv_b_proj.scales")
biases = weights.pop(f"{prefix}.kv_b_proj.biases")
# Try to infer bits and group size
bits = (v.shape[-1] * 32) // dims
group_size = dims // scales.shape[-1]
v = mx.dequantize(
v, scales, biases, bits=bits, group_size=group_size
)
num_heads = self.args.num_attention_heads
v = v.reshape(num_heads, head_dim, -1)
wk = mx.contiguous(
v[:, : self.args.qk_nope_head_dim, :].swapaxes(-1, -2)
)
wv = mx.contiguous(v[:, self.args.qk_nope_head_dim :, :])
if quantized:
wk, wk_scales, wk_biases = mx.quantize(
wk, bits=bits, group_size=group_size
)
wv, wv_scales, wv_biases = mx.quantize(
wv, bits=bits, group_size=group_size
)
weights[f"{prefix}.embed_q.scales"] = wk_scales
weights[f"{prefix}.unembed_out.scales"] = wv_scales
weights[f"{prefix}.embed_q.biases"] = wk_biases
weights[f"{prefix}.unembed_out.biases"] = wv_biases
weights[f"{prefix}.embed_q.weight"] = wk
weights[f"{prefix}.unembed_out.weight"] = wv
return weights
def shard(self, group: Optional[mx.distributed.Group] = None):
group = group or mx.distributed.init()
N = group.size()
rank = group.rank()
for layer in self.model.layers:
layer.self_attn.q_b_proj = shard_linear(
layer.self_attn.q_b_proj, "all-to-sharded", group=group
)
layer.self_attn.o_proj = shard_linear(
layer.self_attn.o_proj, "sharded-to-all", group=group
)
layer.self_attn.num_heads //= N
num_heads = layer.self_attn.num_heads
sh = rank * num_heads
eh = sh + num_heads
def shard_heads(w):
return w[sh:eh]
layer.self_attn.embed_q.apply(shard_heads)
layer.self_attn.unembed_out.apply(shard_heads)
# Shard the MLP
if isinstance(layer.mlp, DeepseekV32MLP):
layer.mlp.gate_proj = shard_linear(
layer.mlp.gate_proj, "all-to-sharded", group=group
)
layer.mlp.down_proj = shard_linear(
layer.mlp.down_proj, "sharded-to-all", group=group
)
layer.mlp.up_proj = shard_linear(
layer.mlp.up_proj, "all-to-sharded", group=group
)
# Shard the MoE. Shard in place since the MoE should be responsible
# for aggregating the results.
else:
layer.mlp.sharding_group = group = group
shard_inplace(
layer.mlp.shared_experts.gate_proj, "all-to-sharded", group=group
)
shard_inplace(
layer.mlp.shared_experts.down_proj, "sharded-to-all", group=group
)
shard_inplace(
layer.mlp.shared_experts.up_proj, "all-to-sharded", group=group
)
shard_inplace(
layer.mlp.switch_mlp.gate_proj, "all-to-sharded", group=group
)
shard_inplace(
layer.mlp.switch_mlp.down_proj, "sharded-to-all", group=group
)
shard_inplace(
layer.mlp.switch_mlp.up_proj, "all-to-sharded", group=group
)
@property
def layers(self):
return self.model.layers[self.model.start_idx : self.model.end_idx]
@property
def cast_predicate(self):
def predicate(k):
return "e_score_correction_bias" not in k
return predicate
def make_cache(self):
return [CacheList(KVCache(), KVCache()) for _ in self.layers]