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@@ -33,3 +33,4 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 *.zip filter=lfs diff=lfs merge=lfs -text
 *.zst filter=lfs diff=lfs merge=lfs -text
 *tfevents* filter=lfs diff=lfs merge=lfs -text
+tokenizer.json filter=lfs diff=lfs merge=lfs -text

checksums.txt

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+6cefd487ca75d8283cb2d3c28a6cd66527455ea926cc39a07816a5715ed87992  ./model-00001-of-00002.safetensors

config.json

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+{
+  "architectures": [
+    "SmallThinkerForCausalLM"
+  ],
+  "attention_dropout": 0.0,
+  "auto_map": {
+    "AutoConfig": "configuration_smallthinker.SmallThinkerConfig",
+    "AutoModel": "modeling_smallthinker.SmallThinkerForCausalLM",
+    "AutoModelForCausalLM": "modeling_smallthinker.SmallThinkerForCausalLM"
+  },
+  "bos_token_id": 151643,
+  "eos_token_id": [151643,151645],
+  "head_dim": 128,
+  "hidden_size": 1536,
+  "initializer_range": 0.02,
+  "max_length": null,
+  "max_position_embeddings": 32768,
+  "model_name": "smallthinker_4b_instruct",
+  "model_type": "smallthinker",
+  "moe_ffn_hidden_size": 768,
+  "moe_num_active_primary_experts": 4,
+  "moe_num_primary_experts": 32,
+  "norm_topk_prob": true,
+  "num_attention_heads": 12,
+  "num_hidden_layers": 32,
+  "num_key_value_heads": 2,
+  "output_router_logits": false,
+  "repetition_penalty": null,
+  "rms_norm_eps": 1e-06,
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+  "rope_scaling": null,
+  "rope_theta": 1.5e6,
+  "sliding_window_size": 4096,
+  "sliding_window_layout": [
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+  "tokenizer_class": "Qwen2Tokenizer",
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+  "torch_dtype": "bfloat16",
+  "transformers_version": "4.53.3",
+  "use_cache": false,
+  "vocab_size": 151936
+}

configuration_smallthinker.py

@@ -0,0 +1,127 @@
+# coding=utf-8
+from transformers.configuration_utils import PretrainedConfig
+
+class SmallThinkerConfig(PretrainedConfig):
+    """
+    This is the configuration class to store the configuration of a [`SmallThinkerModel`]. 
+    It is used to instantiate a SmallThinker model according to the specified arguments, defining the model architecture. 
+    The default values for each of the parameters are the same as the ones used in the original SmallThinker 4B model.
+
+    General configs:
+    - model_type: "smallthinker"
+    - model_name
+    - num_hidden_layers
+    - hidden_size
+
+    Tokenizer configs:
+    - pad_token_id
+    - bos_token_id
+    - eos_token_id
+
+    Embedding configs:
+    - vocab_size
+
+    RMSNorm configs:
+    - rms_norm_eps
+
+    Attention configs:
+    - num_attention_heads
+    - num_key_value_heads
+    - head_dim
+    - use_cache
+    - rope_layout: array of 0 or 1s, 0 for nope, 1 for rope
+    - rope_theta
+    - max_position_embeddings
+    - sliding_window_layout: array of 0 or 1s, 0 for normal attention, 1 for SWA
+    - sliding_window_size
+
+    MoE FFN configs:
+    - moe_num_primary_experts
+    - moe_ffn_hidden_size
+    - moe_primary_router_apply_softmax: Use topk-softmax in routing instead of topk-sigmoid-normalize
+    - moe_num_active_primary_experts
+
+    LM Head configs:
+    - tie_word_embeddings
+
+    Other configs:
+    - initializer_range
+    """
+    def __init__(self,
+        model_type = "smallthinker",
+        model_name="smallthinker_4b_base",
+        num_hidden_layers=32,
+        hidden_size=1536,
+        pad_token_id=None,
+        bos_token_id=151643,
+        eos_token_id=[151643,151645],
+        vocab_size=151936,
+        rms_norm_eps=1e-6,
+        num_attention_heads=12,
+        num_key_value_heads=2,
+        head_dim=128,
+        use_cache=True,
+        rope_layout=[1]*32,
+        rope_theta=1e6,
+        max_position_embeddings=4096 * 32,
+        sliding_window_layout=[0]*32,
+        sliding_window_size=4096,
+        moe_num_primary_experts=32,
+        moe_ffn_hidden_size=768,
+        moe_primary_router_apply_softmax=False,
+        moe_num_active_primary_experts=4,
+        tie_word_embeddings=True,
+        initializer_range=0.02,
+        **kwargs,
+    ):
+        # Configuration sanitizers
+        assert num_attention_heads % num_key_value_heads == 0,      "[SmallThinker config sanitizer] num_attention_heads must be divisible by num_key_value_heads"
+        assert len(rope_layout) == num_hidden_layers,               "[SmallThinker config sanitizer] rope_layout must have the same length as num_hidden_layers"
+        assert len(sliding_window_layout) == num_hidden_layers,     "[SmallThinker config sanitizer] sliding_window_layout must have the same length as num_hidden_layers"
+        
+        # General configs
+        self.model_type = model_type
+        self.model_name = model_name
+        self.num_hidden_layers = num_hidden_layers
+        self.hidden_size = hidden_size
+
+        # Tokenizer configs
+        self.pad_token_id = pad_token_id
+        self.bos_token_id = bos_token_id
+        self.eos_token_id = eos_token_id
+
+        # Embedding configs
+        self.vocab_size = vocab_size
+
+        # RMSNorm configs
+        self.rms_norm_eps = rms_norm_eps
+
+        # Attention configs
+        self.num_attention_heads = num_attention_heads
+        self.num_key_value_heads = num_key_value_heads
+        self.head_dim = head_dim
+        self.use_cache = use_cache
+        self.rope_layout = rope_layout
+        self.rope_theta = rope_theta
+        self.max_position_embeddings = max_position_embeddings
+        self.sliding_window_layout = sliding_window_layout
+        self.sliding_window_size = sliding_window_size
+
+        # MoE FFN configs
+        self.moe_num_primary_experts = moe_num_primary_experts
+        self.moe_ffn_hidden_size = moe_ffn_hidden_size
+        self.moe_primary_router_apply_softmax = moe_primary_router_apply_softmax
+        self.moe_num_active_primary_experts = moe_num_active_primary_experts
+
+        # Other configs
+        self.initializer_range = initializer_range
+
+        super().__init__(pad_token_id=pad_token_id, bos_token_id=bos_token_id, eos_token_id=eos_token_id, tie_word_embeddings=tie_word_embeddings, **kwargs)
+
+        # VLLM config, not used in transformers, but VLLM requires these args to run correctly. DO NOT DELETE!
+        self.sliding_window = sliding_window_size
+        self.sliding_window_pattern = sliding_window_layout
+
+        self._attn_implementation = "sdpa"
+        
+__all__ = ["SmallThinkerConfig"]

generation_config.json

@@ -0,0 +1,9 @@
+{
+  "_from_model_config": true,
+  "bos_token_id": 151643,
+  "eos_token_id": [
+    151643,
+    151645
+  ],
+  "transformers_version": "4.53.3"
+}

model-00001-of-00002.safetensors

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+oid sha256:6cefd487ca75d8283cb2d3c28a6cd66527455ea926cc39a07816a5715ed87992
+size 4999721256

model-00002-of-00002.safetensors

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+oid sha256:20be6f7b5051c683b6e0de1e9794ee1c5ff9cc8380f74246463eb34870061cda
+size 3537628448

model_lm_head.pt

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+version https://git-lfs.github.com/spec/v1
+oid sha256:8d29461f8711ea6d76a1a2e73921fda360a07fd5004b910cb94d41f05322f3ce
+size 78579669

modeling_smallthinker.py

@@ -0,0 +1,287 @@
+# coding=utf-8
+from typing import List, Optional, Union
+
+import torch
+import torch.nn.functional as F
+from torch import nn
+
+from transformers.cache_utils import HybridCache, StaticCache
+from transformers.generation import GenerationMixin
+from transformers.masking_utils import create_causal_mask, create_sliding_window_causal_mask
+from transformers.modeling_flash_attention_utils import FlashAttentionKwargs
+from transformers.modeling_outputs import MoeCausalLMOutputWithPast, MoeModelOutputWithPast
+from transformers.processing_utils import Unpack
+from transformers.utils import LossKwargs, can_return_tuple, logging
+from .configuration_smallthinker import SmallThinkerConfig
+from .modular_smallthinker import *
+
+logger = logging.get_logger(__name__)
+
+
+class SmallThinkerModel(SmallThinkerPreTrainedModel):
+    def __init__(self, config: SmallThinkerConfig):
+        super().__init__(config)
+        self.padding_idx = config.pad_token_id
+        self.vocab_size = config.vocab_size
+
+        self.embed_tokens = nn.Embedding(config.vocab_size, config.hidden_size, self.padding_idx)
+        self.layers = nn.ModuleList(
+            [SmallThinkerDecoderLayer(config, layer_idx) for layer_idx in range(config.num_hidden_layers)]
+        )
+        self.norm = SmallThinkerRMSNorm(config.hidden_size, eps=config.rms_norm_eps)
+        self.rotary_emb = SmallThinkerRotaryEmbedding(config=config)
+        self.gradient_checkpointing = False
+        self.rope_layout = config.rope_layout
+        self.config = config
+
+        # Initialize weights and apply final processing
+        self.post_init()
+
+    def get_input_embeddings(self):
+        return self.embed_tokens
+
+    def set_input_embeddings(self, value):
+        self.embed_tokens = value
+
+    @can_return_tuple
+    def forward(
+        self,
+        input_ids: Optional[torch.LongTensor] = None,
+        attention_mask: Optional[torch.Tensor] = None,
+        position_ids: Optional[torch.LongTensor] = None,
+        past_key_values: Optional[List[torch.FloatTensor]] = None,
+        inputs_embeds: Optional[torch.FloatTensor] = None,
+        use_cache: Optional[bool] = None,
+        output_attentions: Optional[bool] = None,
+        output_hidden_states: Optional[bool] = None,
+        output_router_logits: Optional[bool] = None,
+        cache_position: Optional[torch.LongTensor] = None,
+        **flash_attn_kwargs: Unpack[FlashAttentionKwargs],
+    ) -> MoeModelOutputWithPast:
+        output_attentions = output_attentions if output_attentions is not None else self.config.output_attentions
+        output_router_logits = (
+            output_router_logits if output_router_logits is not None else self.config.output_router_logits
+        )
+        output_hidden_states = (
+            output_hidden_states if output_hidden_states is not None else self.config.output_hidden_states
+        )
+        use_cache = use_cache if use_cache is not None else self.config.use_cache
+
+        if (input_ids is None) ^ (inputs_embeds is not None):
+            raise ValueError("You must specify exactly one of input_ids or inputs_embeds")
+        
+        if inputs_embeds is None:
+            inputs_embeds = self.embed_tokens(input_ids)
+
+        if use_cache and past_key_values is None:
+            batch_size, seq_len, _ = inputs_embeds.shape
+            # NOTE: ideally, `HybridCache` should be initialized outside the model with `layer_device_map`
+            if not hasattr(self.config, "sliding_window_layout") or self.config.sliding_window_layout is None or not any(self.config.sliding_window_layout):
+                past_key_values = StaticCache(
+                    self.config,
+                    max_batch_size=batch_size,
+                    max_cache_len=seq_len,
+                    dtype=inputs_embeds.dtype,
+                    device=self.device,
+                )
+            else:
+                past_key_values = HybridCache(
+                    self.config,
+                    max_batch_size=batch_size,
+                    max_cache_len=seq_len,
+                    dtype=inputs_embeds.dtype,
+                    device=self.device,
+                )
+
+        if cache_position is None:
+            past_seen_tokens = past_key_values.get_seq_length() if past_key_values is not None else 0
+            cache_position = torch.arange(
+                past_seen_tokens, past_seen_tokens + inputs_embeds.shape[1], device=inputs_embeds.device
+            )
+    
+        if position_ids is None:
+            position_ids = cache_position.unsqueeze(0)
+
+        causal_mask = create_causal_mask(
+            config=self.config, 
+            input_embeds=inputs_embeds, 
+            attention_mask=attention_mask, 
+            cache_position=cache_position, 
+            past_key_values=past_key_values, 
+            position_ids=position_ids,
+        )
+        if hasattr(self.config, "sliding_window_layout") and self.config.sliding_window_layout is not None and any(self.config.sliding_window_layout):
+            swa_mask = create_sliding_window_causal_mask(
+                config=self.config, 
+                input_embeds=inputs_embeds, 
+                attention_mask=attention_mask, 
+                cache_position=cache_position, 
+                past_key_values=past_key_values, 
+                position_ids=position_ids,
+            )
+
+        hidden_states = inputs_embeds
+        # create position embeddings to be shared across the decoder layers
+        position_embeddings = self.rotary_emb(hidden_states, position_ids)
+
+        # decoder layers
+        all_hidden_states = () if output_hidden_states else None
+        all_self_attns = () if output_attentions else None
+        all_router_logits = () if output_router_logits else None
+
+        for layer_idx, decoder_layer in enumerate(self.layers):
+            if output_hidden_states:
+                all_hidden_states += (hidden_states,)
+
+            if hasattr(self.config, "sliding_window_layout") and self.config.sliding_window_layout is not None:
+                if self.config.sliding_window_layout[layer_idx] == 1:
+                    layer_outputs = decoder_layer(
+                        hidden_states,
+                        attention_mask=swa_mask,
+                        position_ids=position_ids,
+                        past_key_value=past_key_values,
+                        output_attentions=output_attentions,
+                        output_router_logits=output_router_logits,
+                        use_cache=use_cache,
+                        cache_position=cache_position,
+                        position_embeddings=position_embeddings if self.rope_layout[layer_idx] else None,
+                        **flash_attn_kwargs,
+                    )
+                else:
+                    layer_outputs = decoder_layer(
+                        hidden_states,
+                        attention_mask=causal_mask,
+                        position_ids=position_ids,
+                        past_key_value=past_key_values,
+                        output_attentions=output_attentions,
+                        output_router_logits=output_router_logits,
+                        use_cache=use_cache,
+                        cache_position=cache_position,
+                        position_embeddings=position_embeddings if self.rope_layout[layer_idx] else None,
+                        **flash_attn_kwargs,
+                    )
+            else:
+                layer_outputs = decoder_layer(
+                        hidden_states,
+                        attention_mask=causal_mask,
+                        position_ids=position_ids,
+                        past_key_value=past_key_values,
+                        output_attentions=output_attentions,
+                        output_router_logits=output_router_logits,
+                        use_cache=use_cache,
+                        cache_position=cache_position,
+                        position_embeddings=position_embeddings if self.rope_layout[layer_idx] else None,
+                        **flash_attn_kwargs,
+                    )
+
+            hidden_states = layer_outputs[0]
+
+            if output_attentions:
+                all_self_attns += (layer_outputs[1],)
+
+            if output_router_logits:
+                all_router_logits += (layer_outputs[-1],)
+
+        hidden_states = self.norm(hidden_states)
+
+        # add hidden states from the last decoder layer
+        if output_hidden_states:
+            all_hidden_states += (hidden_states,)
+
+        return MoeModelOutputWithPast(
+            last_hidden_state=hidden_states,
+            past_key_values=past_key_values if use_cache else None,
+            hidden_states=all_hidden_states,
+            attentions=all_self_attns,
+        )
+
+class KwargsForCausalLM(FlashAttentionKwargs, LossKwargs): ...
+
+class SmallThinkerForCausalLM(SmallThinkerPreTrainedModel, GenerationMixin):
+    _tied_weights_keys = ["lm_head.weight"]
+    def __init__(self, config):
+        super().__init__(config)
+        self.model = SmallThinkerModel(config)
+        self.vocab_size = config.vocab_size
+        self.lm_head = nn.Linear(config.hidden_size, config.vocab_size, bias=False)
+        self.post_init()
+
+    def get_input_embeddings(self):
+        return self.model.embed_tokens
+
+    def set_input_embeddings(self, value):
+        self.model.embed_tokens = value
+
+    def get_output_embeddings(self):
+        return self.lm_head
+
+    def set_output_embeddings(self, new_embeddings):
+        self.lm_head = new_embeddings
+
+    def set_decoder(self, decoder):
+        self.model = decoder
+
+    def get_decoder(self):
+        return self.model
+
+    @can_return_tuple
+    def forward(
+        self,
+        input_ids: Optional[torch.LongTensor] = None,
+        attention_mask: Optional[torch.Tensor] = None,
+        position_ids: Optional[torch.LongTensor] = None,
+        past_key_values: Optional[List[torch.FloatTensor]] = None,
+        inputs_embeds: Optional[torch.FloatTensor] = None,
+        use_cache: Optional[bool] = None,
+        output_attentions: Optional[bool] = None,
+        output_hidden_states: Optional[bool] = None,
+        output_router_logits: Optional[bool] = None,
+        cache_position: Optional[torch.LongTensor] = None,
+        logits_to_keep: Union[int, torch.Tensor] = 0,
+        **kwargs: Unpack[KwargsForCausalLM],
+    ) -> MoeCausalLMOutputWithPast:
+
+        output_attentions = output_attentions if output_attentions is not None else self.config.output_attentions
+        output_router_logits = (
+            output_router_logits if output_router_logits is not None else self.config.output_router_logits
+        )
+
+        output_hidden_states = (
+            output_hidden_states if output_hidden_states is not None else self.config.output_hidden_states
+        )
+
+        # decoder outputs consists of (dec_features, layer_state, dec_hidden, dec_attn)
+        outputs: MoeModelOutputWithPast = self.model(
+            input_ids=input_ids,
+            attention_mask=attention_mask,
+            position_ids=position_ids,
+            past_key_values=past_key_values,
+            inputs_embeds=inputs_embeds,
+            use_cache=use_cache,
+            output_attentions=output_attentions,
+            output_hidden_states=output_hidden_states,
+            output_router_logits=output_router_logits,
+            cache_position=cache_position,
+            **kwargs,
+        )
+
+        hidden_states = outputs.last_hidden_state
+        # Only compute necessary logits, and do not upcast them to float
+        slice_indices = slice(-logits_to_keep, None) if isinstance(logits_to_keep, int) else logits_to_keep
+        logits = self.lm_head(hidden_states[:, slice_indices, :])
+
+        return MoeCausalLMOutputWithPast(
+            loss=None,
+            aux_loss=None,
+            logits=logits,
+            past_key_values=outputs.past_key_values,
+            hidden_states=outputs.hidden_states,
+            attentions=outputs.attentions,
+            router_logits=outputs.router_logits,
+        )
+
+__all__ = [
+    "SmallThinkerForCausalLM",
+    "SmallThinkerModel",
+    "SmallThinkerPreTrainedModel"
+]

modular_smallthinker.py

@@ -0,0 +1,407 @@
+from typing import Callable, Optional, Tuple
+
+import torch
+import torch.nn.functional as F
+from torch import nn
+
+from transformers.cache_utils import Cache
+from transformers.modeling_flash_attention_utils import FlashAttentionKwargs
+from transformers.modeling_rope_utils import ROPE_INIT_FUNCTIONS, dynamic_rope_update
+from transformers.modeling_utils import ALL_ATTENTION_FUNCTIONS, PreTrainedModel
+from transformers.processing_utils import Unpack
+from transformers.utils import logging
+from .configuration_smallthinker import SmallThinkerConfig
+
+
+logger = logging.get_logger(__name__)
+
+
+@torch.jit.script
+def repeat_kv(hidden_states: torch.Tensor, n_rep: int) -> torch.Tensor:
+    """
+    This is the equivalent of torch.repeat_interleave(x, dim=1, repeats=n_rep). The hidden states go from (batch,
+    num_key_value_heads, seqlen, head_dim) to (batch, num_attention_heads, seqlen, head_dim)
+    """
+    batch, num_key_value_heads, slen, head_dim = hidden_states.shape
+    if n_rep == 1:
+        return hidden_states
+    hidden_states = hidden_states[:, :, None, :, :].expand(batch, num_key_value_heads, n_rep, slen, head_dim)
+    return hidden_states.reshape(batch, num_key_value_heads * n_rep, slen, head_dim)
+
+
+def rotate_half(x):
+    """Rotates half the hidden dims of the input."""
+    x1 = x[..., : x.shape[-1] // 2]
+    x2 = x[..., x.shape[-1] // 2 :]
+    return torch.cat((-x2, x1), dim=-1)
+
+
+def apply_rotary_pos_emb(q, k, cos, sin, position_ids=None, unsqueeze_dim=1):
+    """Applies Rotary Position Embedding to the query and key tensors.
+
+    Args:
+        q (`torch.Tensor`): The query tensor.
+        k (`torch.Tensor`): The key tensor.
+        cos (`torch.Tensor`): The cosine part of the rotary embedding.
+        sin (`torch.Tensor`): The sine part of the rotary embedding.
+        position_ids (`torch.Tensor`, *optional*):
+            Deprecated and unused.
+        unsqueeze_dim (`int`, *optional*, defaults to 1):
+            The 'unsqueeze_dim' argument specifies the dimension along which to unsqueeze cos[position_ids] and
+            sin[position_ids] so that they can be properly broadcasted to the dimensions of q and k. For example, note
+            that cos[position_ids] and sin[position_ids] have the shape [batch_size, seq_len, head_dim]. Then, if q and
+            k have the shape [batch_size, heads, seq_len, head_dim], then setting unsqueeze_dim=1 makes
+            cos[position_ids] and sin[position_ids] broadcastable to the shapes of q and k. Similarly, if q and k have
+            the shape [batch_size, seq_len, heads, head_dim], then set unsqueeze_dim=2.
+    Returns:
+        `tuple(torch.Tensor)` comprising of the query and key tensors rotated using the Rotary Position Embedding.
+    """
+    cos = cos.unsqueeze(unsqueeze_dim)
+    sin = sin.unsqueeze(unsqueeze_dim)
+    q_embed = (q * cos) + (rotate_half(q) * sin)
+    k_embed = (k * cos) + (rotate_half(k) * sin)
+    return q_embed, k_embed
+
+
+def check_is_swa_layer(config, layer_idx):
+    """
+    Check if the current layer is a sliding window attention layer.
+    """
+    if not hasattr(config, "sliding_window_layout"):
+        return False
+    elif config.sliding_window_layout is None:
+        return False
+    else:
+        return config.sliding_window_layout[layer_idx] == 1
+
+
+class SmallThinkerRMSNorm(nn.Module):
+    def __init__(self, hidden_size, eps=1e-6):
+        """
+        SmallThinkerRMSNorm is equivalent to T5LayerNorm
+        """
+        super().__init__()
+        self.weight = nn.Parameter(torch.ones(hidden_size))
+        self.variance_epsilon = eps
+
+    def forward(self, hidden_states):
+        input_dtype = hidden_states.dtype
+        hidden_states = hidden_states.to(torch.float32)
+        variance = hidden_states.pow(2).mean(-1, keepdim=True)
+        hidden_states = hidden_states * torch.rsqrt(variance + self.variance_epsilon)
+        return self.weight * hidden_states.to(input_dtype)
+
+    def extra_repr(self):
+        return f"{tuple(self.weight.shape)}, eps={self.variance_epsilon}"
+    
+
+class SmallThinkerRotaryEmbedding(nn.Module):
+    def __init__(self, config: SmallThinkerConfig, device=None):
+        super().__init__()
+        if hasattr(config, "rope_scaling") and config.rope_scaling is not None:
+            self.rope_type = config.rope_scaling.get("rope_type", config.rope_scaling.get("type"))
+        else:
+            self.rope_type = "default"
+        self.max_seq_len_cached = config.max_position_embeddings
+        self.original_max_seq_len = config.max_position_embeddings
+
+        self.config = config
+        self.rope_init_fn = ROPE_INIT_FUNCTIONS[self.rope_type]
+
+        inv_freq, self.attention_scaling = self.rope_init_fn(self.config, device)
+        self.register_buffer("inv_freq", inv_freq, persistent=False)
+        self.original_inv_freq = self.inv_freq
+
+    @torch.no_grad()
+    @dynamic_rope_update  # power user: used with advanced RoPE types (e.g. dynamic rope)
+    def forward(self, x, position_ids):
+        inv_freq_expanded = self.inv_freq[None, :, None].float().expand(position_ids.shape[0], -1, 1).to(x.device)
+        position_ids_expanded = position_ids[:, None, :].float()
+
+        device_type = x.device.type if isinstance(x.device.type, str) and x.device.type != "mps" else "cpu"
+        with torch.autocast(device_type=device_type, enabled=False):  # Force float32
+            freqs = (inv_freq_expanded.float() @ position_ids_expanded.float()).transpose(1, 2)
+            emb = torch.cat((freqs, freqs), dim=-1)
+            cos = emb.cos() * self.attention_scaling
+            sin = emb.sin() * self.attention_scaling
+
+        return cos.to(dtype=x.dtype), sin.to(dtype=x.dtype)
+
+
+class SmallThinkerExpert(nn.Module):
+    def __init__(self, config: SmallThinkerConfig):
+        super().__init__()
+        self.hidden_dim = config.hidden_size
+        self.ffn_dim = config.moe_ffn_hidden_size
+
+        self.up = nn.Linear(self.hidden_dim, self.ffn_dim, bias=False)
+        self.gate = nn.Linear(self.hidden_dim, self.ffn_dim, bias=False)
+        self.down = nn.Linear(self.ffn_dim, self.hidden_dim, bias=False)
+        
+    def forward(self, hidden_states: torch.Tensor):
+        current_hidden_states = self.up(hidden_states) * F.relu(self.gate(hidden_states))
+        batch_size, _ = current_hidden_states.shape
+        current_hidden_states = current_hidden_states.view(batch_size, -1)
+        current_hidden_states = self.down(current_hidden_states)
+        return current_hidden_states
+
+
+class SmallThinkerMoeBlock(nn.Module):
+    def __init__(self, config: SmallThinkerConfig):
+        super().__init__()
+        self.hidden_dim = config.hidden_size
+        self.num_primary_experts = config.moe_num_primary_experts
+        self.moe_primary_router_apply_softmax = config.moe_primary_router_apply_softmax
+        self.num_active_primary_experts = config.moe_num_active_primary_experts
+        self.primary_router = nn.Linear(self.hidden_dim, self.num_primary_experts, bias=False)
+        self.experts = nn.ModuleList([SmallThinkerExpert(config) for _ in range(self.num_primary_experts)])
+
+    def forward(self, router_input: torch.Tensor, hidden_states: torch.Tensor) -> torch.Tensor:
+        batch_size, sequence_length, hidden_dim = hidden_states.shape
+        # Flatten the tokens into (bs * sl, hidden_dim)
+        hidden_states = hidden_states.view(-1, hidden_dim)
+        router_input = router_input.view(-1, hidden_dim)
+        # Primary router logits: (bs * sl, n_experts)
+        router_logits = self.primary_router(router_input)
+
+        router_logits, selected_experts = torch.topk(router_logits, self.num_active_primary_experts, dim=-1)
+
+        if self.moe_primary_router_apply_softmax:
+            routing_weights = F.softmax(router_logits, dim=1, dtype=torch.float)
+        else:
+            routing_weights = F.sigmoid(router_logits)
+            routing_weights /= routing_weights.sum(dim=-1, keepdim=True)
+
+        routing_weights = routing_weights.to(hidden_states.dtype)
+
+        # Prepare the final tensor
+        final_hidden_states = torch.zeros(
+            (batch_size * sequence_length, hidden_dim), dtype=hidden_states.dtype, device=hidden_states.device
+        )
+
+        # One hot encode the selected experts to create an expert mask
+        # this will be used to easily index which expert is going to be sollicitated
+        expert_mask = torch.nn.functional.one_hot(selected_experts, num_classes=self.num_primary_experts).permute(2, 1, 0)
+        expert_hitted = (expert_mask.sum(dim=(-1, -2)) > 0).nonzero(as_tuple=True)[0].tolist()
+
+        for expert_idx in expert_hitted:
+            expert_layer = self.experts[expert_idx]
+            idx, top_x = torch.where(expert_mask[expert_idx])
+            # Index the correct hidden states and compute the expert hidden state for
+            # the current expert. We need to make sure to multiply the output hidden
+            # states by `routing_weights` on the corresponding tokens (top-1 and top-2)
+            current_state = hidden_states[top_x].reshape(-1, hidden_dim)
+            current_hidden_states = expert_layer(current_state) * routing_weights[top_x, idx, None]
+
+            # However `index_add_` only support torch tensors for indexing so we'll use the `top_x` tensor here.
+            final_hidden_states.index_add_(0, top_x, current_hidden_states.to(hidden_states.dtype))
+        final_hidden_states = final_hidden_states.reshape(batch_size, sequence_length, hidden_dim)
+        return final_hidden_states, router_logits
+    
+
+def eager_attention_forward(
+    module: nn.Module,
+    query: torch.Tensor,
+    key: torch.Tensor,
+    value: torch.Tensor,
+    attention_mask: Optional[torch.Tensor],
+    scaling: float,
+    dropout: float = 0.0,
+    **kwargs,
+):
+    key_states = repeat_kv(key, module.num_key_value_groups)
+    value_states = repeat_kv(value, module.num_key_value_groups)
+
+    attn_weights = torch.matmul(query, key_states.transpose(2, 3)) * scaling
+    if attention_mask is not None:
+        causal_mask = attention_mask[:, :, :, : key_states.shape[-2]]
+        attn_weights = attn_weights + causal_mask
+
+    attn_weights = nn.functional.softmax(attn_weights, dim=-1, dtype=torch.float32).to(query.dtype)
+    attn_weights = nn.functional.dropout(attn_weights, p=dropout, training=module.training)
+    attn_output = torch.matmul(attn_weights, value_states)
+    attn_output = attn_output.transpose(1, 2).contiguous()
+
+    return attn_output, attn_weights
+
+
+class SmallThinkerAttention(nn.Module):
+    def __init__(self, config: SmallThinkerConfig, layer_idx: int):
+        super().__init__()
+        self.config = config
+        self.layer_idx = layer_idx
+        self.head_dim = config.head_dim
+        self.num_key_value_groups = config.num_attention_heads // config.num_key_value_heads
+        self.scaling = self.head_dim**-0.5
+        self.q_proj = nn.Linear(config.hidden_size, config.num_attention_heads * self.head_dim, bias=False)
+        self.k_proj = nn.Linear(config.hidden_size, config.num_key_value_heads * self.head_dim, bias=False)
+        self.v_proj = nn.Linear(config.hidden_size, config.num_key_value_heads * self.head_dim, bias=False)
+        self.o_proj = nn.Linear(config.num_attention_heads * self.head_dim, config.hidden_size, bias=False)
+        self.sliding_window = config.sliding_window_size if config.sliding_window_layout[layer_idx] else None
+
+    def forward(
+        self,
+        hidden_states: torch.Tensor,
+        position_embeddings: Tuple[torch.Tensor, torch.Tensor],
+        attention_mask: Optional[torch.Tensor],
+        past_key_value: Optional[Cache] = None,
+        cache_position: Optional[torch.LongTensor] = None,
+        **kwargs: Unpack[FlashAttentionKwargs],
+    ) -> Tuple[torch.Tensor, Optional[torch.Tensor], Optional[Tuple[torch.Tensor]]]:
+
+        input_shape = hidden_states.shape[:-1]
+        hidden_shape = (*input_shape, -1, self.head_dim)
+
+        query_states = self.q_proj(hidden_states).view(hidden_shape).transpose(1, 2)
+        key_states = self.k_proj(hidden_states).view(hidden_shape).transpose(1, 2)
+        value_states = self.v_proj(hidden_states).view(hidden_shape).transpose(1, 2)
+        
+        if position_embeddings:
+            cos, sin = position_embeddings
+            query_states, key_states = apply_rotary_pos_emb(query_states, key_states, cos, sin)
+        else:
+            cos, sin = None, None
+
+        if past_key_value is not None:
+            cache_kwargs = {
+                "sin": sin,
+                "cos": cos,
+                "cache_position": cache_position,
+                "sliding_window": self.sliding_window,
+            }
+            key_states, value_states = past_key_value.update(key_states, value_states, self.layer_idx, cache_kwargs)
+
+        attention_interface: Callable = eager_attention_forward
+        if self.config._attn_implementation != "eager":
+            if self.config._attn_implementation == "sdpa" and kwargs.get("output_attentions", False):
+                logger.warning_once(
+                    "`torch.nn.functional.scaled_dot_product_attention` does not support `output_attentions=True`. Falling back to "
+                    'eager attention. This warning can be removed using the argument `attn_implementation="eager"` when loading the model.'
+                )
+            else:
+                attention_interface = ALL_ATTENTION_FUNCTIONS[self.config._attn_implementation]
+
+        attn_output, attn_weights = attention_interface(
+            self,
+            query_states,
+            key_states,
+            value_states,
+            attention_mask,
+            dropout=0.0,
+            scaling=self.scaling,
+            sliding_window=self.sliding_window,
+            **kwargs,
+        )
+
+        attn_output = attn_output.reshape(*input_shape, -1).contiguous()
+        attn_output = self.o_proj(attn_output)
+        return attn_output, attn_weights
+    
+
+class SmallThinkerDecoderLayer(nn.Module):
+    def __init__(self, config: SmallThinkerConfig, layer_idx: int):
+        super().__init__()
+        self.hidden_size = config.hidden_size
+        self.self_attn = SmallThinkerAttention(config, layer_idx)
+        self.block_sparse_moe = SmallThinkerMoeBlock(config)
+        self.input_layernorm = SmallThinkerRMSNorm(config.hidden_size, eps=config.rms_norm_eps)
+        self.post_attention_layernorm = SmallThinkerRMSNorm(config.hidden_size, eps=config.rms_norm_eps)
+        self.is_swa = check_is_swa_layer(config, layer_idx)
+
+        if self.is_swa and config._attn_implementation == "sdpa":
+            logger.warning_once(
+                f"Sliding Window Attention is enabled but not optimized for `{config._attn_implementation}`; "
+                "unexpected results may be encountered."
+            )
+
+    def forward(
+        self,
+        hidden_states: torch.Tensor,
+        attention_mask: Optional[torch.Tensor] = None,
+        position_ids: Optional[torch.LongTensor] = None,
+        past_key_value: Optional[Tuple[torch.Tensor]] = None,
+        output_attentions: Optional[bool] = False,
+        output_router_logits: Optional[bool] = False,
+        use_cache: Optional[bool] = False,
+        cache_position: Optional[torch.LongTensor] = None,
+        position_embeddings: Optional[Tuple[torch.Tensor, torch.Tensor]] = None,
+        **kwargs: Unpack[FlashAttentionKwargs],
+    ) -> Tuple[torch.FloatTensor, Optional[Tuple[torch.FloatTensor, torch.FloatTensor]]]:
+        """
+        Args:
+            hidden_states (`torch.FloatTensor`): input to the layer of shape `(batch, seq_len, embed_dim)`
+            attention_mask (`torch.FloatTensor`, *optional*): attention mask of size
+                `(batch, sequence_length)` where padding elements are indicated by 0.
+            past_key_value (`Tuple(torch.FloatTensor)`, *optional*): cached past key and value projection states
+            output_attentions (`bool`, *optional*):
+                Whether or not to return the attentions tensors of all attention layers. See `attentions` under
+                returned tensors for more detail.
+            output_router_logits (`bool`, *optional*):
+                Whether or not to return the logits of all the routers. They are useful for computing the router loss, and
+                should not be returned during inference.
+            use_cache (`bool`, *optional*):
+                If set to `True`, `past_key_values` key value states are returned and can be used to speed up decoding
+                (see `past_key_values`).
+            cache_position (`torch.LongTensor` of shape `(sequence_length)`, *optional*):
+                Indices depicting the position of the input sequence tokens in the sequence.
+            kwargs (`dict`, *optional*):
+                Arbitrary kwargs to be ignored, used for FSDP and other methods that injects code
+                into the model
+        """
+        residual = hidden_states
+        router_input = hidden_states
+        hidden_states = self.input_layernorm(hidden_states)
+        # Self Attention 
+        hidden_states, self_attn_weights = self.self_attn(
+            hidden_states=hidden_states,
+            position_embeddings=position_embeddings,
+            attention_mask=attention_mask,
+            position_ids=position_ids,
+            past_key_value=past_key_value,
+            output_attentions=output_attentions,
+            use_cache=use_cache,
+            cache_position=cache_position,
+            **kwargs,
+        )
+        hidden_states = residual + hidden_states
+
+        # Fully Connected
+        residual = hidden_states
+        hidden_states = self.post_attention_layernorm(hidden_states)
+        hidden_states, router_logits = self.block_sparse_moe(router_input, hidden_states)
+        hidden_states = residual + hidden_states
+
+        outputs = (hidden_states,)
+        if output_attentions:
+            outputs += (self_attn_weights,)
+        if output_router_logits:
+            outputs += (router_logits,)
+        return outputs
+    
+
+class SmallThinkerPreTrainedModel(PreTrainedModel):
+    config_class = SmallThinkerConfig
+    base_model_prefix = "model"
+    supports_gradient_checkpointing = False
+    _no_split_modules = ["SmallThinkerDecoderLayer"]
+    _skip_keys_device_placement = ["past_key_values"]
+    _supports_flash_attn_2 = True
+    _supports_sdpa = True
+    _supports_flex_attn = False
+    _supports_cache_class = True
+    _supports_quantized_cache = True
+    _supports_static_cache = False
+    _supports_attention_backend = True
+
+    def _init_weights(self, module):
+        std = self.config.initializer_range
+        if isinstance(module, nn.Linear):
+            module.weight.data.normal_(mean=0.0, std=std)
+            if module.bias is not None:
+                module.bias.data.zero_()
+        elif isinstance(module, nn.Embedding):
+            module.weight.data.normal_(mean=0.0, std=std)
+            if module.padding_idx is not None:
+                module.weight.data[module.padding_idx].zero_()
+        elif isinstance(module, SmallThinkerRMSNorm):
+            module.weight.data.fill_(1.0)

tokenizer.json

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:aeb13307a71acd8fe81861d94ad54ab689df773318809eed3cbe794b4492dae4
+size 11422654

tokenizer_config.json

@@ -0,0 +1,207 @@
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+  "add_prefix_space": false,
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+      "single_word": false,
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+  ],
+  "bos_token": null,
+  "chat_template": "{%- if tools %}\n    {{- '<|im_start|>system\\n' }}\n    {%- if messages[0]['role'] == 'system' %}\n        {{- messages[0]['content'] }}\n    {%- else %}\n        {{- 'You are SmallThinker. You are a helpful assistant.' }}\n    {%- endif %}\n    {{- \"\\n\\n# Tools\\n\\nYou may call one or more functions to assist with the user query.\\n\\nYou are provided with function signatures within <tools></tools> XML tags:\\n<tools>\" }}\n    {%- for tool in tools %}\n        {{- \"\\n\" }}\n        {{- tool | tojson }}\n    {%- endfor %}\n    {{- \"\\n</tools>\\n\\nFor each function call, return a json object with function name and arguments within <tool_call></tool_call> XML tags:\\n<tool_call>\\n{\\\"name\\\": <function-name>, \\\"arguments\\\": <args-json-object>}\\n</tool_call><|im_end|>\\n\" }}\n{%- else %}\n    {%- if messages[0]['role'] == 'system' %}\n        {{- '<|im_start|>system\\n' + messages[0]['content'] + '<|im_end|>\\n' }}\n    {%- else %}\n        {{- '<|im_start|>system\\nYou are SmallThinker. You are a helpful assistant.<|im_end|>\\n' }}\n    {%- endif %}\n{%- endif %}\n{%- for message in messages %}\n    {%- if (message.role == \"user\") or (message.role == \"system\" and not loop.first) or (message.role == \"assistant\" and not message.tool_calls) %}\n        {{- '<|im_start|>' + message.role + '\\n' + message.content + '<|im_end|>' + '\\n' }}\n    {%- elif message.role == \"assistant\" %}\n        {{- '<|im_start|>' + message.role }}\n        {%- if message.content %}\n            {{- '\\n' + message.content }}\n        {%- endif %}\n        {%- for tool_call in message.tool_calls %}\n            {%- if tool_call.function is defined %}\n                {%- set tool_call = tool_call.function %}\n            {%- endif %}\n            {{- '\\n<tool_call>\\n{\"name\": \"' }}\n            {{- tool_call.name }}\n            {{- '\", \"arguments\": ' }}\n            {{- tool_call.arguments | tojson }}\n            {{- '}\\n</tool_call>' }}\n        {%- endfor %}\n        {{- '<|im_end|>\\n' }}\n    {%- elif message.role == \"tool\" %}\n        {%- if (loop.index0 == 0) or (messages[loop.index0 - 1].role != \"tool\") %}\n            {{- '<|im_start|>user' }}\n        {%- endif %}\n        {{- '\\n<tool_response>\\n' }}\n        {{- message.content }}\n        {{- '\\n</tool_response>' }}\n        {%- if loop.last or (messages[loop.index0 + 1].role != \"tool\") %}\n            {{- '<|im_end|>\\n' }}\n        {%- endif %}\n    {%- endif %}\n{%- endfor %}\n{%- if add_generation_prompt %}\n    {{- '<|im_start|>assistant\\n' }}\n{%- endif %}\n",
+  "clean_up_tokenization_spaces": false,
+  "eos_token": "<|im_end|>",
+  "errors": "replace",
+  "model_max_length": 131072,
+  "pad_token": "<|endoftext|>",
+  "split_special_tokens": false,
+  "tokenizer_class": "Qwen2Tokenizer",
+  "unk_token": null
+}