[Model] Snowflake arctic model implementation (#4652)

Co-authored-by: Dash Desai <[email protected]>
Co-authored-by: Aurick Qiao <[email protected]>
Co-authored-by: Aurick Qiao <[email protected]>
Co-authored-by: Aurick Qiao <[email protected]>
Co-authored-by: Cody Yu <[email protected]>

examples/offline_inference_arctic.py

@@ -0,0 +1,26 @@
+from vllm import LLM, SamplingParams
+
+# Sample prompts.
+prompts = [
+    "Hello, my name is",
+    "The president of the United States is",
+    "The capital of France is",
+    "The future of AI is",
+]
+# Create a sampling params object.
+sampling_params = SamplingParams(temperature=0.8, top_p=0.95)
+
+# Create an LLM.
+llm = LLM(model="snowflake/snowflake-arctic-instruct",
+          quantization="deepspeedfp",
+          tensor_parallel_size=8,
+          trust_remote_code=True)
+# Generate texts from the prompts. The output is a list of RequestOutput objects
+# that contain the prompt, generated text, and other information.
+
+outputs = llm.generate(prompts, sampling_params)
+# Print the outputs.
+for output in outputs:
+    prompt = output.prompt
+    generated_text = output.outputs[0].text
+    print(f"Prompt: {prompt!r}, Generated text: {generated_text!r}")

vllm/model_executor/layers/fused_moe/__init__.py

@@ -1,7 +1,9 @@
 from vllm.model_executor.layers.fused_moe.fused_moe import (
-    fused_moe, get_config_file_name)
+    fused_experts, fused_moe, fused_topk, get_config_file_name)
 
 __all__ = [
     "fused_moe",
+    "fused_topk",
+    "fused_experts",
     "get_config_file_name",
 ]

vllm/model_executor/layers/fused_moe/fused_moe.py

@@ -308,60 +308,16 @@ def get_moe_configs(E: int, N: int,
     return None
 
 
-def fused_moe(
+def fused_topk(
     hidden_states: torch.Tensor,
-    w1: torch.Tensor,
-    w2: torch.Tensor,
     gating_output: torch.Tensor,
     topk: int,
     renormalize: bool,
-    inplace: bool = False,
-    override_config: Optional[Dict[str, Any]] = None,
-    use_fp8: bool = False,
-    w1_scale: Optional[torch.Tensor] = None,
-    w2_scale: Optional[torch.Tensor] = None,
-    a1_scale: Optional[torch.Tensor] = None,
-    a2_scale: Optional[torch.Tensor] = None,
-) -> torch.Tensor:
-    """
-    This function computes a Mixture of Experts (MoE) layer using two sets of
-    weights, w1 and w2, and top-k gating mechanism.
-
-    Parameters:
-    - hidden_states (torch.Tensor): The input tensor to the MoE layer.
-    - w1 (torch.Tensor): The first set of expert weights.
-    - w2 (torch.Tensor): The second set of expert weights.
-    - gating_output (torch.Tensor): The output of the gating operation
-        (before softmax).
-    - topk (int): The number of top-k experts to select.
-    - renormalize (bool): If True, renormalize the top-k weights to sum to 1.
-    - inplace (bool): If True, perform the operation in-place.
-        Defaults to False.
-    - override_config (Optional[Dict[str, Any]]): Optional override
-        for the kernel configuration.
-    - use_fp8 (bool): If True, use fp8 arithmetic to compute the inner
-        products for w1 and w2. Defaults to False.
-    - w1_scale (Optional[torch.Tensor]): Optional scale to be used for
-        w1.
-    - w2_scale (Optional[torch.Tensor]): Optional scale to be used for
-        w2.
-
-    Returns:
-    - torch.Tensor: The output tensor after applying the MoE layer.
-    """
-    # Check constraints.
+):
     assert hidden_states.shape[0] == gating_output.shape[0], (
         "Number of tokens mismatch")
-    assert hidden_states.shape[1] == w1.shape[2], "Hidden size mismatch"
-    assert gating_output.shape[1] == w1.shape[0], "Number of experts mismatch"
-    assert hidden_states.is_contiguous(), "Hidden_states must be contiguous"
-    assert w1.is_contiguous(), "Expert weights1 must be contiguous"
-    assert w2.is_contiguous(), "Expert weights2 must be contiguous"
-    assert hidden_states.dtype in [
-        torch.float32, torch.float16, torch.bfloat16
-    ]
+
     M, _ = hidden_states.shape
-    E, N, _ = w1.shape
 
     if is_hip():
         # The MoE kernels are not yet supported on ROCm.
@@ -393,6 +349,33 @@ def fused_moe(
         del token_expert_indicies  # Not used. Will be used in the future.
     if renormalize:
         topk_weights = topk_weights / topk_weights.sum(dim=-1, keepdim=True)
+    return topk_weights, topk_ids
+
+
+def fused_experts(hidden_states: torch.Tensor,
+                  w1: torch.Tensor,
+                  w2: torch.Tensor,
+                  topk_weights: torch.Tensor,
+                  topk_ids: torch.Tensor,
+                  inplace: bool = False,
+                  override_config: Optional[Dict[str, Any]] = None,
+                  use_fp8: bool = False,
+                  w1_scale: Optional[torch.Tensor] = None,
+                  w2_scale: Optional[torch.Tensor] = None,
+                  a1_scale: Optional[torch.Tensor] = None,
+                  a2_scale: Optional[torch.Tensor] = None):
+    # Check constraints.
+    assert hidden_states.shape[1] == w1.shape[2], "Hidden size mismatch"
+    assert topk_weights.shape == topk_ids.shape, "topk shape mismatch"
+    assert hidden_states.is_contiguous(), "Hidden_states must be contiguous"
+    assert w1.is_contiguous(), "Expert weights1 must be contiguous"
+    assert w2.is_contiguous(), "Expert weights2 must be contiguous"
+    assert hidden_states.dtype in [
+        torch.float32, torch.float16, torch.bfloat16
+    ]
+
+    M, _ = hidden_states.shape
+    E, N, _ = w1.shape
 
     if override_config:
         config = override_config
@@ -477,3 +460,63 @@ def fused_moe(
                          out=hidden_states)
     return torch.sum(intermediate_cache3.view(*intermediate_cache3.shape),
                      dim=1)
+
+
+def fused_moe(
+    hidden_states: torch.Tensor,
+    w1: torch.Tensor,
+    w2: torch.Tensor,
+    gating_output: torch.Tensor,
+    topk: int,
+    renormalize: bool,
+    inplace: bool = False,
+    override_config: Optional[Dict[str, Any]] = None,
+    use_fp8: bool = False,
+    w1_scale: Optional[torch.Tensor] = None,
+    w2_scale: Optional[torch.Tensor] = None,
+    a1_scale: Optional[torch.Tensor] = None,
+    a2_scale: Optional[torch.Tensor] = None,
+) -> torch.Tensor:
+    """
+    This function computes a Mixture of Experts (MoE) layer using two sets of
+    weights, w1 and w2, and top-k gating mechanism.
+
+    Parameters:
+    - hidden_states (torch.Tensor): The input tensor to the MoE layer.
+    - w1 (torch.Tensor): The first set of expert weights.
+    - w2 (torch.Tensor): The second set of expert weights.
+    - gating_output (torch.Tensor): The output of the gating operation
+        (before softmax).
+    - topk (int): The number of top-k experts to select.
+    - renormalize (bool): If True, renormalize the top-k weights to sum to 1.
+    - inplace (bool): If True, perform the operation in-place.
+        Defaults to False.
+    - override_config (Optional[Dict[str, Any]]): Optional override
+        for the kernel configuration.
+    - use_fp8 (bool): If True, use fp8 arithmetic to compute the inner
+        products for w1 and w2. Defaults to False.
+    - w1_scale (Optional[torch.Tensor]): Optional scale to be used for
+        w1.
+    - w2_scale (Optional[torch.Tensor]): Optional scale to be used for
+        w2.
+
+    Returns:
+    - torch.Tensor: The output tensor after applying the MoE layer.
+    """
+    # Check constraints.
+    assert gating_output.shape[1] == w1.shape[0], "Number of experts mismatch"
+
+    topk_weights, topk_ids = fused_topk(hidden_states, gating_output, topk,
+                                        renormalize)
+    return fused_experts(hidden_states,
+                         w1,
+                         w2,
+                         topk_weights,
+                         topk_ids,
+                         inplace=inplace,
+                         override_config=override_config,
+                         use_fp8=use_fp8,
+                         w1_scale=w1_scale,
+                         w2_scale=w2_scale,
+                         a1_scale=a1_scale,
+                         a2_scale=a2_scale)

vllm/model_executor/layers/quantization/__init__.py

@@ -4,6 +4,8 @@
 from vllm.model_executor.layers.quantization.awq import AWQConfig
 from vllm.model_executor.layers.quantization.base_config import (
     QuantizationConfig)
+from vllm.model_executor.layers.quantization.deepspeedfp import (
+    DeepSpeedFPConfig)
 from vllm.model_executor.layers.quantization.fp8 import Fp8Config
 from vllm.model_executor.layers.quantization.gptq import GPTQConfig
 from vllm.model_executor.layers.quantization.gptq_marlin import (
@@ -19,6 +21,7 @@
     "squeezellm": SqueezeLLMConfig,
     "gptq_marlin": GPTQMarlinConfig,
     "marlin": MarlinConfig,
+    "deepspeedfp": DeepSpeedFPConfig
 }