979 lines
34 KiB
Python
979 lines
34 KiB
Python
import os
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import torch
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import torch.distributed
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from torch import nn
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from torch.nn import functional as F
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from typing import List
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from loguru import logger
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from functools import lru_cache
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HAS_BITS_AND_BYTES = True
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try:
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import bitsandbytes as bnb
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from bitsandbytes.nn import Int8Params, Params4bit
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except ImportError:
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HAS_BITS_AND_BYTES = False
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from accelerate import init_empty_weights
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from text_generation_server.utils.gptq.quant_linear import QuantLinear
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from text_generation_server.utils.import_utils import IS_CUDA_SYSTEM, IS_ROCM_SYSTEM
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HAS_AWQ = True
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try:
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from text_generation_server.utils.awq.quantize.qmodule import WQLinear
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except ImportError:
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HAS_AWQ = False
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try:
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major, _minor = torch.cuda.get_device_capability()
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except Exception:
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major = 1
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HAS_EXLLAMA = False
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CAN_EXLLAMA = major >= 8
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V2 = os.getenv("EXLLAMA_VERSION", "2") == "2"
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if V2 and int(os.getenv("WORLD_SIZE", "1")) > 1:
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logger.warning(
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"Disabling exllama v2 and using v1 instead because there are issues when sharding"
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)
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V2 = False
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if os.getenv("DISABLE_EXLLAMA") == "True":
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HAS_EXLLAMA = False
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elif CAN_EXLLAMA:
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try:
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if V2:
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from text_generation_server.utils.gptq.exllamav2 import (
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QuantLinear as ExllamaQuantLinear,
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create_exllama_buffers,
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set_device,
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)
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HAS_EXLLAMA = "2"
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else:
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from text_generation_server.utils.gptq.exllama import (
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Ex4bitLinear as ExllamaQuantLinear,
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create_exllama_buffers,
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set_device,
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)
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HAS_EXLLAMA = "1"
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except ImportError:
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pass
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from typing import Optional
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HAS_EETQ = False
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try:
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from EETQ import quant_weights, w8_a16_gemm
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HAS_EETQ = True
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except ImportError:
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pass
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# Monkey patching
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@classmethod
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def load_layer_norm(cls, prefix, weights, eps):
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weight = weights.get_tensor(f"{prefix}.weight")
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bias = weights.get_tensor(f"{prefix}.bias")
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with init_empty_weights():
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ln = cls(weight.shape, eps=eps)
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ln.weight = nn.Parameter(weight)
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ln.bias = nn.Parameter(bias)
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return ln
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@classmethod
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def load_layer_norm_no_bias(cls, prefix, weights, eps):
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weight = weights.get_tensor(f"{prefix}.weight")
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with init_empty_weights():
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ln = cls(weight.shape, eps=eps)
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ln.weight = nn.Parameter(weight)
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ln.bias = None
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return ln
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@classmethod
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def load_conv2d(cls, prefix, weights, in_channels, out_channels, kernel_size, stride):
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weight = weights.get_tensor(f"{prefix}.weight")
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bias = weights.get_tensor(f"{prefix}.bias")
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with init_empty_weights():
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conv2d = cls(
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in_channels=in_channels,
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out_channels=out_channels,
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kernel_size=kernel_size,
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stride=stride,
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)
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conv2d.weight = nn.Parameter(weight)
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conv2d.bias = nn.Parameter(bias)
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return conv2d
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@classmethod
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def load_conv2d_no_bias(
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cls, prefix, weights, in_channels, out_channels, kernel_size, stride
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):
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weight = weights.get_tensor(f"{prefix}.weight")
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with init_empty_weights():
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conv2d = cls(
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in_channels=in_channels,
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out_channels=out_channels,
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kernel_size=kernel_size,
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stride=stride,
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)
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conv2d.weight = nn.Parameter(weight)
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conv2d.bias = None
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return conv2d
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torch.nn.Conv2d.load = load_conv2d
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torch.nn.Conv2d.load_no_bias = load_conv2d_no_bias
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torch.nn.LayerNorm.load = load_layer_norm
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torch.nn.LayerNorm.load_no_bias = load_layer_norm_no_bias
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class FastLinear(nn.Module):
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def __init__(
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self,
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weight,
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bias,
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) -> None:
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super().__init__()
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self.weight = nn.Parameter(weight)
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if bias is not None:
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self.bias = nn.Parameter(bias)
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else:
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self.bias = None
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@classmethod
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def load(cls, config, prefix: str, weights, bias: bool):
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weight = weights.get_tensor(f"{prefix}.weight")
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if bias:
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bias = weights.get_tensor(f"{prefix}.bias")
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else:
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bias = None
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return cls(weight, bias)
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def forward(self, input: torch.Tensor) -> torch.Tensor:
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return F.linear(input, self.weight, self.bias)
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class EETQLinear(nn.Module):
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def __init__(
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self,
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weight,
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bias,
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) -> None:
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super().__init__()
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device = weight.device
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weight = torch.t(weight).contiguous().cpu()
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weight, scale = quant_weights(weight, torch.int8, False)
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self.weight = weight.cuda(device)
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self.scale = scale.cuda(device)
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self.bias = bias.cuda(device) if bias is not None else None
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def forward(self, input: torch.Tensor) -> torch.Tensor:
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output = w8_a16_gemm(input, self.weight, self.scale)
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output = output + self.bias if self.bias is not None else output
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return output
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class Linear8bitLt(nn.Module):
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def __init__(
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self,
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weight,
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bias,
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has_fp16_weights=True,
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memory_efficient_backward=False,
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threshold=0.0,
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index=None,
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):
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super().__init__()
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assert (
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not memory_efficient_backward
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), "memory_efficient_backward is no longer required and the argument is deprecated in 0.37.0 and will be removed in 0.39.0"
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self.state = bnb.MatmulLtState()
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self.index = index
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# Necessary for stacked layers
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self.state.threshold = threshold
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self.state.has_fp16_weights = has_fp16_weights
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self.state.memory_efficient_backward = memory_efficient_backward
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if threshold > 0.0 and not has_fp16_weights:
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self.state.use_pool = True
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self.weight = Int8Params(
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weight.data,
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has_fp16_weights=has_fp16_weights,
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requires_grad=has_fp16_weights,
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)
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self.weight.cuda(weight.device)
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self.bias = bias
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def init_8bit_state(self):
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self.state.CB = self.weight.CB
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self.state.SCB = self.weight.SCB
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self.weight.CB = None
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self.weight.SCB = None
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def forward(self, x: torch.Tensor):
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self.state.is_training = self.training
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if self.weight.CB is not None:
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self.init_8bit_state()
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# weights are cast automatically as Int8Params, but the bias has to be cast manually
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if self.bias is not None and self.bias.dtype != x.dtype:
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self.bias.data = self.bias.data.to(x.dtype)
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out = bnb.matmul(x, self.weight, bias=self.bias, state=self.state)
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if not self.state.has_fp16_weights:
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if self.state.CB is not None and self.state.CxB is not None:
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# we converted 8-bit row major to turing/ampere format in the first inference pass
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# we no longer need the row-major weight
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del self.state.CB
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self.weight.data = self.state.CxB
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return out
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class Linear4bit(nn.Module):
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def __init__(self, weight, bias, quant_type):
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super().__init__()
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self.weight = Params4bit(
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weight.data,
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requires_grad=False,
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compress_statistics=True,
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quant_type=quant_type,
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)
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self.compute_dtype = None
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self.weight.cuda(weight.device)
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self.bias = bias
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def forward(self, x: torch.Tensor):
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# weights are cast automatically as Int8Params, but the bias has to be cast manually
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if self.bias is not None and self.bias.dtype != x.dtype:
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self.bias.data = self.bias.data.to(x.dtype)
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if getattr(self.weight, "quant_state", None) is None:
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print(
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"FP4 quantization state not initialized. Please call .cuda() or .to(device) on the LinearFP4 layer first."
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)
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inp_dtype = x.dtype
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if self.compute_dtype is not None:
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x = x.to(self.compute_dtype)
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bias = None if self.bias is None else self.bias.to(self.compute_dtype)
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out = bnb.matmul_4bit(
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x, self.weight.t(), bias=bias, quant_state=self.weight.quant_state
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)
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out = out.to(inp_dtype)
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return out
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@lru_cache(1)
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def warn_deprecate_bnb():
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logger.warning(
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"Bitsandbytes 8bit is deprecated, using `eetq` is a drop-in replacement, and has much better performnce"
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)
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def get_linear(weight, bias, quantize):
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if quantize is None:
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linear = FastLinear(weight, bias)
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elif quantize == "eetq":
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if HAS_EETQ:
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linear = EETQLinear(weight, bias)
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else:
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raise ImportError(
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"Please install EETQ from https://github.com/NetEase-FuXi/EETQ"
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)
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elif quantize == "bitsandbytes":
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warn_deprecate_bnb()
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linear = Linear8bitLt(
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weight,
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bias,
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has_fp16_weights=False,
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threshold=6.0,
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)
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if bias is not None:
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linear.bias = nn.Parameter(bias)
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elif quantize == "bitsandbytes-fp4":
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linear = Linear4bit(
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weight,
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bias,
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quant_type="fp4",
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)
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elif quantize == "bitsandbytes-nf4":
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linear = Linear4bit(
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weight,
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bias,
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quant_type="nf4",
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)
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elif quantize == "gptq":
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try:
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qweight, qzeros, scales, g_idx, bits, groupsize, use_exllama = weight
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except Exception:
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raise NotImplementedError(
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f"The passed weight is not `gptq` compatible, loader needs to be updated."
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)
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if use_exllama:
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linear = ExllamaQuantLinear(
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qweight, qzeros, scales, g_idx, bias, bits, groupsize
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)
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else:
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linear = QuantLinear(
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qweight,
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qzeros,
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scales,
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g_idx,
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bias,
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bits,
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groupsize,
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)
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elif quantize == "awq":
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try:
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qweight, qzeros, scales, _, bits, groupsize, _ = weight
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except Exception:
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raise NotImplementedError(
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f"The passed weight is not `awq` compatible, loader needs to be updated."
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)
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linear = WQLinear(
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w_bit=bits,
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group_size=groupsize,
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qweight=qweight,
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qzeros=qzeros,
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scales=scales,
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bias=bias is not None,
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)
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else:
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raise NotImplementedError(f"Quantization `{quantize}` is not implemented yet.")
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return linear
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class SuperLayer(nn.Module):
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def __init__(self, linear):
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super().__init__()
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self.linear = linear
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def forward(self, x):
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return self.linear.forward(x)
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|
|
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class TensorParallelHead(SuperLayer):
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def __init__(self, linear, process_group, should_gather: bool):
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super().__init__(linear)
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self.process_group = process_group
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self.should_gather = should_gather
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@staticmethod
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def load(config, prefix: str, weights):
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if weights.process_group.size() > 1:
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try:
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weight = weights.get_sharded(f"{prefix}.weight", dim=0)
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should_gather = True
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except AssertionError:
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# If the vocab size is not divisible by number of shards
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# just load the entire thing.
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weight = weights.get_tensor(f"{prefix}.weight")
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should_gather = False
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else:
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weight = weights.get_tensor(f"{prefix}.weight")
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should_gather = False
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# GPTQ,AWQ,EETQ don't quantize heads (nor embeddings)
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if config.quantize in ["gptq", "awq", "eetq"]:
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quantize = None
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else:
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quantize = config.quantize
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return TensorParallelHead(
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get_linear(weight, bias=None, quantize=quantize),
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process_group=weights.process_group,
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should_gather=should_gather,
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)
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def forward(self, input: torch.Tensor) -> torch.Tensor:
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if not self.should_gather:
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return super().forward(input)
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world_size = self.process_group.size()
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if len(input.shape) == 2 and isinstance(self.linear, FastLinear):
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out_dim = self.linear.weight.shape[0]
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if input.shape[0] == 1:
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world_out = input.new_empty(1, out_dim * world_size)
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local_out = input.new_empty(1, out_dim)
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gather_input = local_out
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else:
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world_out = input.new_empty(out_dim * world_size, input.shape[0])
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gather_input = input.new_empty(out_dim, input.shape[0])
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local_out = gather_input.T
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torch.mm(input, self.linear.weight.T, out=local_out)
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torch.distributed.all_gather_into_tensor(
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world_out, gather_input, group=self.process_group
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)
|
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|
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if input.shape[0] == 1:
|
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return world_out
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return world_out.T
|
|
|
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output = super().forward(input)
|
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world_output = [
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torch.empty_like(output) for _ in range(self.process_group.size())
|
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]
|
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torch.distributed.all_gather(world_output, output, group=self.process_group)
|
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world_output = torch.cat(world_output, dim=-1)
|
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return world_output
|
|
|
|
|
|
class TensorParallelColumnLinear(SuperLayer):
|
|
@classmethod
|
|
def load_qkv(cls, config, prefix: str, weights, bias: bool):
|
|
"""Specific method when the QKV was joined after the fact"""
|
|
weight = weights.get_weights_col_packed_qkv(prefix, quantize=config.quantize)
|
|
if bias:
|
|
raise NotImplementedError("packed_qkv only implemented for baichuan")
|
|
else:
|
|
bias = None
|
|
linear = get_linear(weight, bias, config.quantize)
|
|
return cls(linear)
|
|
|
|
@classmethod
|
|
def load(cls, config, prefix: str, weights, bias: bool):
|
|
return cls.load_multi(config, [prefix], weights, bias, dim=0)
|
|
|
|
@classmethod
|
|
def load_multi(cls, config, prefixes: List[str], weights, bias: bool, dim: int):
|
|
weight = weights.get_multi_weights_col(
|
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prefixes, quantize=config.quantize, dim=dim
|
|
)
|
|
|
|
if bias:
|
|
b = [weights.get_sharded(f"{p}.bias", dim=0) for p in prefixes]
|
|
bias = torch.cat(b, dim=dim)
|
|
else:
|
|
bias = None
|
|
linear = get_linear(weight, bias, config.quantize)
|
|
return cls(linear)
|
|
|
|
|
|
class TensorParallelRowLinear(SuperLayer):
|
|
def __init__(self, linear, process_group):
|
|
super().__init__(linear)
|
|
self.process_group = process_group
|
|
|
|
@classmethod
|
|
def load(cls, config, prefix: str, weights, bias: bool):
|
|
weight = weights.get_multi_weights_row(prefix, quantize=config.quantize)
|
|
|
|
if bias and weights.process_group.rank() == 0:
|
|
# Rank is only on the first rank process
|
|
bias = weights.get_tensor(f"{prefix}.bias")
|
|
else:
|
|
bias = None
|
|
return cls(
|
|
get_linear(weight, bias, config.quantize),
|
|
process_group=weights.process_group,
|
|
)
|
|
|
|
def forward(self, input: torch.Tensor) -> torch.Tensor:
|
|
out = super().forward(input)
|
|
if self.process_group.size() > 1:
|
|
torch.distributed.all_reduce(out, group=self.process_group)
|
|
return out
|
|
|
|
|
|
class TensorParallelEmbedding(nn.Module):
|
|
def __init__(self, prefix: str, weights, reduce=True):
|
|
super().__init__()
|
|
weight = weights.get_partial_sharded(f"{prefix}.weight", dim=0)
|
|
num_embeddings = weights.get_shape(f"{prefix}.weight")[0]
|
|
|
|
process_group = weights.process_group
|
|
|
|
world_size = process_group.size()
|
|
rank = process_group.rank()
|
|
|
|
block_size = num_embeddings // world_size
|
|
self.min_id = rank * block_size
|
|
self.max_id = min(num_embeddings, (rank + 1) * block_size)
|
|
self.null_idx = block_size
|
|
self.process_group = weights.process_group
|
|
self.reduce = reduce
|
|
|
|
"""Additional 0 entry used for masking"""
|
|
self.weight = nn.Parameter(F.pad(weight, (0, 0, 0, 1)))
|
|
|
|
def forward(self, input: torch.Tensor) -> torch.Tensor:
|
|
# default all out of bounds values to `self.null_idx` that will then be mapped to 0
|
|
# translate for [0, self.max_id - self.min_id[
|
|
input = torch.where(
|
|
(self.min_id > input) | (input >= self.max_id),
|
|
self.null_idx,
|
|
input - self.min_id,
|
|
)
|
|
out = torch.nn.functional.embedding(input, self.weight)
|
|
if self.reduce and self.process_group.size() > 1:
|
|
torch.distributed.all_reduce(out, group=self.process_group)
|
|
return out
|
|
|
|
|
|
try:
|
|
if IS_CUDA_SYSTEM:
|
|
import dropout_layer_norm
|
|
elif IS_ROCM_SYSTEM:
|
|
from vllm import layernorm_ops
|
|
else:
|
|
dropout_layer_norm = None
|
|
|
|
class FastLayerNorm(nn.LayerNorm):
|
|
def forward(self, hidden_states, residual=None):
|
|
if hidden_states.shape[-1] > 8192 or IS_ROCM_SYSTEM:
|
|
if residual is not None:
|
|
hidden_states += residual
|
|
residual = hidden_states
|
|
|
|
return super(FastLayerNorm, self).forward(hidden_states), residual
|
|
else:
|
|
(
|
|
normed_hidden_states,
|
|
residual,
|
|
*rest,
|
|
) = dropout_layer_norm.dropout_add_ln_fwd(
|
|
hidden_states,
|
|
residual,
|
|
self.weight,
|
|
self.bias,
|
|
None,
|
|
None,
|
|
None,
|
|
None,
|
|
0.0,
|
|
self.eps,
|
|
1.0,
|
|
0,
|
|
None,
|
|
False,
|
|
False,
|
|
)
|
|
if residual is None:
|
|
residual = hidden_states
|
|
|
|
return normed_hidden_states, residual
|
|
|
|
class FastRMSNorm(nn.Module):
|
|
def __init__(self, weight: torch.Tensor, eps: float):
|
|
super().__init__()
|
|
|
|
self.weight = nn.Parameter(weight)
|
|
self.variance_epsilon = eps
|
|
|
|
@classmethod
|
|
def load(cls, prefix, weights, eps=1e-6):
|
|
weight = weights.get_tensor(f"{prefix}.weight")
|
|
return cls(weight, eps)
|
|
|
|
def forward(self, hidden_states, residual=None):
|
|
if hidden_states.shape[-1] > 8192:
|
|
if residual is not None:
|
|
hidden_states += residual
|
|
residual = hidden_states
|
|
|
|
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
|
|
)
|
|
|
|
# convert into half-precision if necessary
|
|
if self.weight.dtype in [torch.float16, torch.bfloat16]:
|
|
hidden_states = hidden_states.to(self.weight.dtype)
|
|
|
|
return self.weight * hidden_states, residual
|
|
elif IS_CUDA_SYSTEM:
|
|
# faster post attention rms norm
|
|
(
|
|
normed_hidden_states,
|
|
res,
|
|
*rest,
|
|
) = dropout_layer_norm.dropout_add_ln_fwd(
|
|
hidden_states,
|
|
residual,
|
|
self.weight,
|
|
None,
|
|
None,
|
|
None,
|
|
None,
|
|
None,
|
|
0.0,
|
|
self.variance_epsilon,
|
|
1.0,
|
|
0,
|
|
None,
|
|
False,
|
|
True, # Activate RMSNorm
|
|
)
|
|
if res is None:
|
|
res = hidden_states
|
|
|
|
return normed_hidden_states, res
|
|
elif IS_ROCM_SYSTEM:
|
|
# We use VLLM RMSNorm kernel that can be compiled for RoCm, instead of Flash Attention ones that can not.
|
|
if residual is not None:
|
|
hidden_states += residual
|
|
residual = hidden_states
|
|
|
|
out = torch.empty_like(hidden_states)
|
|
layernorm_ops.rms_norm(
|
|
out,
|
|
hidden_states,
|
|
self.weight.data,
|
|
self.variance_epsilon,
|
|
)
|
|
return out, residual
|
|
else:
|
|
raise ValueError(
|
|
"Your system seem to be not supported. Please check your install or open an issue at https://github.com/huggingface/text-generation-inference/issues with a clear reproduction."
|
|
)
|
|
|
|
except ImportError:
|
|
pass
|
|
|
|
try:
|
|
if IS_CUDA_SYSTEM:
|
|
from flash_attn.layers.rotary import RotaryEmbedding
|
|
import rotary_emb
|
|
elif IS_ROCM_SYSTEM:
|
|
from vllm import pos_encoding_ops
|
|
|
|
def _create_inv_freq(dim, base, device):
|
|
inv_freq = 1.0 / (
|
|
base ** (torch.arange(0, dim, 2, device=device, dtype=torch.float32) / dim)
|
|
)
|
|
return inv_freq
|
|
|
|
def _get_rope_config(config):
|
|
if os.getenv("ROPE_SCALING", None) is not None:
|
|
rope_scaling = {
|
|
"type": os.environ["ROPE_SCALING"],
|
|
"factor": float(os.environ["ROPE_FACTOR"]),
|
|
}
|
|
return rope_scaling
|
|
return getattr(config, "rope_scaling", None)
|
|
|
|
class PositionRotaryEmbedding(nn.Module):
|
|
def __init__(self, inv_freq, scaling_factor):
|
|
super().__init__()
|
|
self.inv_freq = inv_freq
|
|
self._seq_len_cached = 0
|
|
self._cos_cached = None
|
|
self._sin_cached = None
|
|
self._cos_k_cached = None
|
|
self._sin_k_cached = None
|
|
self.scaling_factor = scaling_factor
|
|
self.dynamic_args = None
|
|
|
|
def forward(
|
|
self,
|
|
query: torch.Tensor,
|
|
key: torch.Tensor,
|
|
cos: torch.Tensor,
|
|
sin: torch.Tensor,
|
|
):
|
|
# Such controlflows may add some overhead.
|
|
if IS_CUDA_SYSTEM:
|
|
rotary_dim = cos.shape[-1]
|
|
q1 = query[..., :rotary_dim]
|
|
q2 = query[..., rotary_dim : 2 * rotary_dim]
|
|
|
|
rotary_emb.apply_rotary(q1, q2, cos, sin, q1, q2, False)
|
|
|
|
k1 = key[..., :rotary_dim]
|
|
k2 = key[..., rotary_dim : 2 * rotary_dim]
|
|
|
|
rotary_emb.apply_rotary(k1, k2, cos, sin, k1, k2, False)
|
|
elif IS_ROCM_SYSTEM:
|
|
# NOTE: On RoCm systems, we use a ROPE implementatation adapted from VLLM which launches a single kernel for both query/key, contrary to flash-attn implementation used on NVIDIA systems.
|
|
# Compiling flash-attn rotary on RoCm, it appears hipcc is unable to unroll loops, resulting in an even slower inference compared to eager: https://github.com/pytorch/pytorch/issues/113773
|
|
|
|
head_size = query.shape[-1]
|
|
|
|
# Inplace operation, updating query and key.
|
|
pos_encoding_ops.rotary_embedding(query, key, head_size, cos, sin, True)
|
|
else:
|
|
raise ValueError(
|
|
"Your system seem to be not supported. Please check your install or open an issue at https://github.com/huggingface/text-generation-inference/issues with a clear reproduction."
|
|
)
|
|
|
|
@classmethod
|
|
def static(cls, config, dim, base, device):
|
|
inv_freq = _create_inv_freq(dim, base, device)
|
|
scaling_factor = None
|
|
rope_scaling = _get_rope_config(config)
|
|
if rope_scaling is not None:
|
|
scaling_factor = rope_scaling["factor"]
|
|
if rope_scaling["type"] == "linear":
|
|
pass
|
|
elif rope_scaling["type"] == "dynamic":
|
|
return DynamicPositionRotaryEmbedding(
|
|
dim=dim,
|
|
max_position_embeddings=config.max_position_embeddings,
|
|
base=base,
|
|
device=inv_freq.device,
|
|
scaling_factor=scaling_factor,
|
|
)
|
|
elif rope_scaling["type"] == "yarn":
|
|
return YarnPositionRotaryEmbedding(
|
|
dim=2 * inv_freq.shape[0],
|
|
max_position_embeddings=rope_scaling[
|
|
"original_max_position_embeddings"
|
|
],
|
|
base=10000.0,
|
|
device=inv_freq.device,
|
|
scaling_factor=scaling_factor,
|
|
extrapolation_factor=1,
|
|
attn_factor=1,
|
|
beta_fast=32,
|
|
beta_slow=1,
|
|
)
|
|
else:
|
|
raise NotImplementedError(
|
|
f"rope scaling type {rope_scaling['type']} is not implemented or invalid"
|
|
)
|
|
return cls(inv_freq, scaling_factor)
|
|
|
|
@classmethod
|
|
def load(cls, config, prefix, weights):
|
|
# XXX: Always load this in float32 !
|
|
dtype = weights.dtype
|
|
weights.dtype = torch.float32
|
|
inv_freq = weights.get_tensor(f"{prefix}.inv_freq")
|
|
weights.dtype = dtype
|
|
|
|
scaling_factor = None
|
|
rope_scaling = _get_rope_config(config)
|
|
if rope_scaling is not None:
|
|
scaling_factor = rope_scaling["factor"]
|
|
if rope_scaling["type"] == "linear":
|
|
pass
|
|
elif rope_scaling["type"] == "dynamic":
|
|
return DynamicPositionRotaryEmbedding(
|
|
dim=2 * inv_freq.shape[0],
|
|
max_position_embeddings=config.max_position_embeddings,
|
|
base=10000.0,
|
|
device=inv_freq.device,
|
|
scaling_factor=scaling_factor,
|
|
)
|
|
elif rope_scaling["type"] == "yarn":
|
|
return YarnPositionRotaryEmbedding(
|
|
dim=2 * inv_freq.shape[0],
|
|
max_position_embeddings=rope_scaling[
|
|
"original_max_position_embeddings"
|
|
],
|
|
base=10000.0,
|
|
device=inv_freq.device,
|
|
scaling_factor=scaling_factor,
|
|
extrapolation_factor=1,
|
|
attn_factor=1,
|
|
beta_fast=32,
|
|
beta_slow=1,
|
|
)
|
|
else:
|
|
raise NotImplementedError(
|
|
f"rope scaling type {rope_scaling['type']} is not implemented or invalid"
|
|
)
|
|
return cls(inv_freq, scaling_factor)
|
|
|
|
def _update_cos_sin_cache(self, dtype, device, seqlen):
|
|
# Reset the tables if the sequence length has changed,
|
|
# or if we're on a new device (possibly due to tracing for instance)
|
|
if (
|
|
seqlen > self._seq_len_cached
|
|
or self._cos_cached.device != device
|
|
or self._cos_cached.dtype != dtype
|
|
):
|
|
self._seq_len_cached = seqlen
|
|
t = torch.arange(seqlen, device=device, dtype=self.inv_freq.dtype)
|
|
if self.scaling_factor is not None:
|
|
t /= self.scaling_factor
|
|
# Don't do einsum, it converts fp32 to fp16
|
|
# freqs = torch.einsum("i,j->ij", t, self.inv_freq)
|
|
|
|
freqs = torch.outer(t, self.inv_freq.to(device=t.device))
|
|
self._cos_cached = torch.cos(freqs).to(dtype)
|
|
self._sin_cached = torch.sin(freqs).to(dtype)
|
|
|
|
def get_cos_sin(
|
|
self, position_ids: torch.Tensor, max_s: int, dtype: torch.dtype
|
|
):
|
|
"""
|
|
Return cos and sin for the asked position ids
|
|
"""
|
|
if IS_ROCM_SYSTEM:
|
|
# For RoCm, we always use float cos/sin to avoid a cast.
|
|
# For NVIDIA, for some reason, the flash-attn rotary kernel requires cos/sin and query/key to be of same dtype: https://github.com/Dao-AILab/flash-attention/blob/017716451d446e464dde9aca3a3c1ed2209caaa9/csrc/rotary/rotary.cpp#L26
|
|
# But later on goes and cast cos/sin to float anyway: https://github.com/Dao-AILab/flash-attention/blob/017716451d446e464dde9aca3a3c1ed2209caaa9/csrc/rotary/rotary_cuda.cu#L29, which looks suboptimal.
|
|
dtype = torch.float32
|
|
|
|
self._update_cos_sin_cache(dtype, position_ids.device, max_s)
|
|
|
|
cos = torch.index_select(self._cos_cached, 0, position_ids)
|
|
sin = torch.index_select(self._sin_cached, 0, position_ids)
|
|
# Note: this unsqueeze is not necessary on RoCm + VLLM ROPE implementation, but we leave it as is to avoid yet an other controlflow.
|
|
return cos.unsqueeze(1), sin.unsqueeze(1)
|
|
|
|
class DynamicPositionRotaryEmbedding(PositionRotaryEmbedding):
|
|
def __init__(self, dim, max_position_embeddings, base, device, scaling_factor):
|
|
inv_freq = _create_inv_freq(dim, base, device)
|
|
super().__init__(inv_freq, scaling_factor)
|
|
self.dim = dim
|
|
self.max_position_embeddings = max_position_embeddings
|
|
self.base = base
|
|
|
|
def _update_cos_sin_cache(self, dtype, device, seqlen):
|
|
# Reset the tables if the sequence length has changed,
|
|
# or if we're on a new device (possibly due to tracing for instance)
|
|
if (
|
|
seqlen > self._seq_len_cached
|
|
or self._cos_cached.device != device
|
|
or self._cos_cached.dtype != dtype
|
|
):
|
|
if seqlen > self.max_position_embeddings:
|
|
newbase = self.base * (
|
|
(self.scaling_factor * seqlen / self.max_position_embeddings)
|
|
- (self.scaling_factor - 1)
|
|
) ** (self.dim / (self.dim - 2))
|
|
self.inv_freq = _create_inv_freq(
|
|
self.dim, newbase, self.inv_freq.device
|
|
)
|
|
self._seq_len_cached = seqlen
|
|
t = torch.arange(seqlen, device=device, dtype=self.inv_freq.dtype)
|
|
# Don't do einsum, it converts fp32 to fp16
|
|
# freqs = torch.einsum("i,j->ij", t, self.inv_freq)
|
|
|
|
freqs = torch.outer(t, self.inv_freq.to(device=t.device))
|
|
self._cos_cached = torch.cos(freqs).to(dtype)
|
|
self._sin_cached = torch.sin(freqs).to(dtype)
|
|
|
|
# Inverse dim formula to find dim based on number of rotations
|
|
import math
|
|
|
|
def find_correction_dim(
|
|
num_rotations, dim, base=10000, max_position_embeddings=2048
|
|
):
|
|
return (
|
|
dim * math.log(max_position_embeddings / (num_rotations * 2 * math.pi))
|
|
) / (2 * math.log(base))
|
|
|
|
# Find dim range bounds based on rotations
|
|
def find_correction_range(
|
|
low_rot, high_rot, dim, base=10000, max_position_embeddings=2048
|
|
):
|
|
low = math.floor(
|
|
find_correction_dim(low_rot, dim, base, max_position_embeddings)
|
|
)
|
|
high = math.ceil(
|
|
find_correction_dim(high_rot, dim, base, max_position_embeddings)
|
|
)
|
|
return max(low, 0), min(high, dim - 1) # Clamp values just in case
|
|
|
|
def linear_ramp_mask(min, max, dim):
|
|
if min == max:
|
|
max += 0.001 # Prevent singularity
|
|
|
|
linear_func = (torch.arange(dim, dtype=torch.float32) - min) / (max - min)
|
|
ramp_func = torch.clamp(linear_func, 0, 1)
|
|
return ramp_func
|
|
|
|
def get_mscale(scale=1):
|
|
if scale <= 1:
|
|
return 1.0
|
|
return 0.1 * math.log(scale) + 1.0
|
|
|
|
class YarnPositionRotaryEmbedding(PositionRotaryEmbedding):
|
|
def __init__(
|
|
self,
|
|
dim,
|
|
max_position_embeddings,
|
|
base,
|
|
device,
|
|
scaling_factor,
|
|
*,
|
|
extrapolation_factor,
|
|
attn_factor,
|
|
beta_fast,
|
|
beta_slow,
|
|
):
|
|
inv_freq = _create_inv_freq(dim, base, device)
|
|
super().__init__(inv_freq, scaling_factor)
|
|
self.dim = dim
|
|
self.max_position_embeddings = max_position_embeddings
|
|
self.base = base
|
|
self.extrapolation_factor = extrapolation_factor
|
|
self.attn_factor = attn_factor
|
|
self.beta_fast = beta_fast
|
|
self.beta_slow = beta_slow
|
|
self.mscale = float(
|
|
get_mscale(self.scaling_factor) * self.attn_factor
|
|
) # Get n-d magnitude scaling corrected for interpolation
|
|
|
|
def _update_cos_sin_cache(self, dtype, device, seqlen):
|
|
# Reset the tables if the sequence length has changed,
|
|
# or if we're on a new device (possibly due to tracing for instance)
|
|
if (
|
|
seqlen > self._seq_len_cached
|
|
or self._cos_cached.device != device
|
|
or self._cos_cached.dtype != dtype
|
|
):
|
|
if seqlen > self.max_position_embeddings:
|
|
inv_freq_extrapolation = _create_inv_freq(
|
|
self.dim, self.base, self.inv_freq.device
|
|
)
|
|
freqs = 1.0 / inv_freq_extrapolation
|
|
inv_freq_interpolation = 1.0 / (self.scaling_factor * freqs)
|
|
low, high = find_correction_range(
|
|
self.beta_fast,
|
|
self.beta_slow,
|
|
self.dim,
|
|
self.base,
|
|
self.max_position_embeddings,
|
|
)
|
|
inv_freq_mask = (
|
|
1
|
|
- linear_ramp_mask(low, high, self.dim // 2).float().to(device)
|
|
) * self.extrapolation_factor # Get n-d rotational scaling corrected for extrapolation
|
|
inv_freq = (
|
|
inv_freq_interpolation * (1 - inv_freq_mask)
|
|
+ inv_freq_extrapolation * inv_freq_mask
|
|
)
|
|
|
|
self.inv_freq = inv_freq
|
|
self.mscale = float(
|
|
get_mscale(self.scaling_factor) * self.attn_factor
|
|
) # Get n-d magnitude scaling corrected for interpolation
|
|
|
|
self._seq_len_cached = seqlen
|
|
t = torch.arange(seqlen, device=device, dtype=self.inv_freq.dtype)
|
|
# Don't do einsum, it converts fp32 to fp16
|
|
# freqs = torch.einsum("i,j->ij", t, self.inv_freq)
|
|
|
|
freqs = torch.outer(t, self.inv_freq.to(device=t.device))
|
|
self._cos_cached = (torch.cos(freqs) * self.mscale).to(dtype)
|
|
self._sin_cached = (torch.sin(freqs) * self.mscale).to(dtype)
|
|
|
|
except ImportError:
|
|
pass
|