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# Copyright (c) 2025 Baidu, Inc. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from transformers import PretrainedConfig
class Ernie4_5_MoeConfig(PretrainedConfig):
r"""
This is the configuration class to store the configuration of a [`Ernie4_5_Model`].
It is used to instantiate an ERNIE-4.5 model according to the specified arguments,
defining the model architecture. Instantiating a configuration with the defaults
will yield a similar configuration to that of ERNIE-4.5-21B-A3B-PT [baidu/ERNIE-4.5-21B-A3B-PT].
Configuration objects inherit from [`PretrainedConfig`] and can be used to control the model outputs. Read the
documentation from [`PretrainedConfig`] for more information.
Args:
vocab_size (int): Size of the vocabulary (number of unique tokens)
hidden_size (int): Dimensionality of the encoder layers and the pooler layer
intermediate_size (int): Dimensionality of the "intermediate" (feed-forward) layer
max_position_embeddings (int): Maximum sequence length the model can handle
num_hidden_layers (int): Number of hidden layers in the Transformer encoder
num_attention_heads (int): Number of attention heads for each attention layer
rms_norm_eps (float): The epsilon used by the RMS normalization layers
use_cache (bool): Whether to use caching for faster generation (decoding)
use_flash_attention (bool): Whether to use FlashAttention for optimized attention computation
pad_token_id (int): Token ID used for padding sequences
bos_token_id (int): Token ID used for beginning-of-sequence
eos_token_id (int): Token ID used for end-of-sequence
use_bias (bool): Whether to use bias terms in linear layers
rope_theta (float): The base period of the RoPE embeddings
weight_share_add_bias (bool): Whether to share bias weights in certain layers
ignored_index (int): Target value that is ignored during loss computation
attention_probs_dropout_prob (float): Dropout probability for attention weights
hidden_dropout_prob (float): Dropout probability for hidden layers
num_key_value_heads (int): Number of key/value heads (for Grouped Query Attention)
max_sequence_length (int): Maximum sequence length for positional embeddings
moe_num_experts: Number of experts in MoE layers
moe_capacity: Capacity configuration for MoE layers
moe_layer_interval: Interval between MoE layers
moe_layer_start_index: Starting layer index for MoE
moe_layer_end_index: Ending layer index for MoE (-1 means last layer)
sinkhorn_2gate: Whether to use sinkhorn 2-gate routing
sinkhorn_temp: Temperature for sinkhorn routing
moe_dropout_prob: Dropout probability for MoE layers
moe_gate: Type of gating mechanism ('top2', etc.)
moe_intermediate_size: Intermediate size for MoE layers
moe_gate_act: Activation function for gating
moe_k: Number of experts to route to
**kwargs: Additional base model configuration parameters
"""
model_type = "ernie4_5_moe"
use_keep_in_fp32_modules = True
keys_to_ignore_at_inference = ["past_key_values"]
attribute_map = {
"n_positions": "max_position_embeddings",
"n_embd": "hidden_size",
"n_layer": "num_hidden_layers",
"n_head": "num_attention_heads",
"n_inner": "intermediate_size",
"activation_function": "hidden_act",
}
# Default tensor parallel plan for base model `ernie_4_5_moe`
base_model_tp_plan = {
"model.layers.*.self_attn.q_proj": "colwise_rep",
"model.layers.*.self_attn.k_proj": "colwise_rep",
"model.layers.*.self_attn.v_proj": "colwise_rep",
"model.layers.*.self_attn.o_proj": "rowwise_rep",
"model.layers.*.mlp.experts.*.gate_proj": "colwise",
"model.layers.*.mlp.experts.*.up_proj": "colwise",
"model.layers.*.mlp.experts.*.down_proj": "rowwise",
"model.layers.*.mlp.gate_proj": "colwise",
"model.layers.*.mlp.up_proj": "colwise",
"model.layers.*.mlp.down_proj": "rowwise",
}
base_model_pp_plan = {
"embed_tokens": (["input_ids"], ["inputs_embeds"]),
"layers": (["hidden_states", "attention_mask"], ["hidden_states"]),
"norm": (["hidden_states"], ["hidden_states"]),
}
def __init__(
self,
vocab_size=32000,
hidden_size=768,
intermediate_size=11008,
num_hidden_layers=2,
num_attention_heads=2,
num_key_value_heads=None,
max_position_embeddings=32768,
use_sliding_window=None,
sliding_window=None,
rms_norm_eps=1e-6,
use_cache=False,
pad_token_id=0,
bos_token_id=1,
eos_token_id=2,
attention_probs_dropout_prob=0.0,
hidden_dropout_prob=0.0,
rope_theta=10000.0,
use_flash_attention=False,
use_rmsnorm=True,
use_bias=False,
weight_share_add_bias=True,
max_sequence_length=None,
ignored_index=-100,
use_moe=True,
moe_num_experts=64,
moe_capacity=(64, 64, 64),
moe_layer_interval=2,
moe_layer_start_index=0,
moe_layer_end_index=-1,
sinkhorn_2gate=True,
sinkhorn_temp=3e-2,
moe_dropout_prob=0.0,
moe_gate="top2",
moe_intermediate_size=3584,
moe_k=2,
moe_gate_act: str = "softmax",
moe_use_aux_free=False,
**kwargs,
):
self.vocab_size = vocab_size
self.max_position_embeddings = max_position_embeddings
self.use_sliding_window = use_sliding_window
self.sliding_window = sliding_window
self.hidden_size = hidden_size
self.intermediate_size = intermediate_size
self.num_hidden_layers = num_hidden_layers
self.num_attention_heads = num_attention_heads
if num_key_value_heads is None:
num_key_value_heads = num_attention_heads
self.num_key_value_heads = num_key_value_heads
self.use_rmsnorm = use_rmsnorm
self.rms_norm_eps = rms_norm_eps
self.rope_theta = rope_theta
self.max_sequence_length = max_sequence_length
self.pad_token_id = pad_token_id
self.bos_token_id = bos_token_id
self.eos_token_id = eos_token_id
self.ignored_index = ignored_index
self.use_cache = use_cache
self.use_bias = use_bias
self.weight_share_add_bias = weight_share_add_bias
self.use_flash_attention = use_flash_attention
self.attention_probs_dropout_prob = attention_probs_dropout_prob
self.hidden_dropout_prob = hidden_dropout_prob
self.use_moe = moe_num_experts > 0 and use_moe
self.moe_num_experts = moe_num_experts
self.moe_capacity = moe_capacity
self.sinkhorn_2gate = sinkhorn_2gate
self.sinkhorn_temp = sinkhorn_temp
self.moe_layer_interval = moe_layer_interval
self.moe_dropout_prob = moe_dropout_prob
self.moe_gate = moe_gate
self.moe_intermediate_size = moe_intermediate_size
self.moe_k = moe_k
self.moe_layer_start_index = moe_layer_start_index
self.moe_layer_end_index = (
self.num_hidden_layers - 1
if moe_layer_end_index == -1
else moe_layer_end_index
)
self.moe_gate_act = moe_gate_act
self.moe_use_aux_free = moe_use_aux_free
# Set default for tied embeddings if not specified.
if "tie_word_embeddings" not in kwargs:
kwargs["tie_word_embeddings"] = False
super().__init__(
pad_token_id=pad_token_id,
bos_token_id=bos_token_id,
eos_token_id=eos_token_id,
**kwargs,
)
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