gptq-w4-gs32-sparse-compressed-oc14336-ic4096
/
internal
/donttouch_unpacking_autogptq
/qlinear_cuda_old.py.ori.py
import math | |
from logging import getLogger | |
import numpy as np | |
import torch | |
import torch.nn as nn | |
import transformers | |
logger = getLogger(__name__) | |
try: | |
import autogptq_cuda_64 | |
import autogptq_cuda_256 | |
_autogptq_cuda_available = True | |
except ImportError: | |
logger.warning("CUDA extension not installed.") | |
autogptq_cuda_256 = None | |
autogptq_cuda_64 = None | |
_autogptq_cuda_available = False | |
class QuantLinear(nn.Module): | |
QUANT_TYPE = "cuda-old" | |
def __init__( | |
self, | |
bits, | |
group_size, | |
infeatures, | |
outfeatures, | |
bias, | |
use_cuda_fp16=True, | |
kernel_switch_threshold=128, | |
trainable=False, | |
weight_dtype=torch.float16, | |
): | |
super().__init__() | |
global _autogptq_cuda_available | |
if bits not in [2, 3, 4, 8]: | |
raise NotImplementedError("Only 2,3,4,8 bits are supported.") | |
if trainable: | |
_autogptq_cuda_available = False | |
self.infeatures = infeatures | |
self.outfeatures = outfeatures | |
self.bits = bits | |
self.group_size = group_size if group_size != -1 else infeatures | |
self.maxq = 2**self.bits - 1 | |
self.register_buffer( | |
"qweight", | |
torch.zeros((infeatures // 32 * self.bits, outfeatures), dtype=torch.int32), | |
) | |
self.register_buffer( | |
"qzeros", | |
torch.zeros( | |
( | |
math.ceil(infeatures / self.group_size), | |
outfeatures // 32 * self.bits, | |
), | |
dtype=torch.int32, | |
), | |
) | |
self.register_buffer( | |
"scales", | |
torch.zeros( | |
(math.ceil(infeatures / self.group_size), outfeatures), | |
dtype=weight_dtype, | |
), | |
) | |
self.register_buffer( | |
"g_idx", | |
torch.tensor([i // self.group_size for i in range(infeatures)], dtype=torch.int32), | |
) | |
if bias: | |
self.register_buffer("bias", torch.zeros((outfeatures), dtype=weight_dtype)) | |
else: | |
self.bias = None | |
self.half_indim = self.infeatures // 2 | |
self.use_cuda_fp16 = use_cuda_fp16 if bits != 8 else False | |
# is performed by unpacking the weights and using torch.matmul | |
if self.bits in [2, 4, 8]: | |
self.wf = torch.tensor(list(range(0, 32, self.bits)), dtype=torch.int32).unsqueeze(0) | |
elif self.bits == 3: | |
self.wf = torch.tensor( | |
[ | |
[0, 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 0], | |
[0, 1, 4, 7, 10, 13, 16, 19, 22, 25, 28, 31], | |
[0, 2, 5, 8, 11, 14, 17, 20, 23, 26, 29, 0], | |
], | |
dtype=torch.int32, | |
).reshape(1, 3, 12) | |
self.kernel_switch_threshold = kernel_switch_threshold | |
self.autogptq_cuda_available = _autogptq_cuda_available | |
self.autogptq_cuda = autogptq_cuda_256 | |
if infeatures % 256 != 0 or outfeatures % 256 != 0: | |
self.autogptq_cuda = autogptq_cuda_64 | |
if infeatures % 64 != 0 or outfeatures % 64 != 0: | |
self.autogptq_cuda_available = False | |
self.trainable = trainable | |
def post_init(self): | |
pass | |
def pack(self, linear, scales, zeros, g_idx): | |
W = linear.weight.data.clone() | |
if isinstance(linear, nn.Conv2d): | |
W = W.flatten(1) | |
if isinstance(linear, transformers.pytorch_utils.Conv1D): | |
W = W.t() | |
scales = scales.t().contiguous() | |
zeros = zeros.t().contiguous() | |
scale_zeros = zeros * scales | |
self.scales = scales.clone().to(dtype=linear.weight.dtype) | |
if linear.bias is not None: | |
self.bias = linear.bias.clone().to(dtype=linear.weight.dtype) | |
intweight = [] | |
for idx in range(self.infeatures): | |
g_idx = idx // self.group_size | |
intweight.append(torch.round((W[:, idx] + scale_zeros[g_idx]) / self.scales[g_idx]).to(torch.int)[:, None]) | |
intweight = torch.cat(intweight, dim=1) | |
intweight = intweight.t().contiguous() | |
intweight = intweight.numpy().astype(np.uint32) | |
i = 0 | |
row = 0 | |
qweight = np.zeros((intweight.shape[0] // 32 * self.bits, intweight.shape[1]), dtype=np.uint32) | |
while row < qweight.shape[0]: | |
if self.bits in [2, 4, 8]: | |
for j in range(i, i + (32 // self.bits)): | |
qweight[row] |= intweight[j] << (self.bits * (j - i)) | |
i += 32 // self.bits | |
row += 1 | |
elif self.bits == 3: | |
for j in range(i, i + 10): | |
qweight[row] |= intweight[j] << (3 * (j - i)) | |
i += 10 | |
qweight[row] |= intweight[i] << 30 | |
row += 1 | |
qweight[row] |= (intweight[i] >> 2) & 1 | |
i += 1 | |
for j in range(i, i + 10): | |
qweight[row] |= intweight[j] << (3 * (j - i) + 1) | |
i += 10 | |
qweight[row] |= intweight[i] << 31 | |
row += 1 | |
qweight[row] |= (intweight[i] >> 1) & 0x3 | |
i += 1 | |
for j in range(i, i + 10): | |
qweight[row] |= intweight[j] << (3 * (j - i) + 2) | |
i += 10 | |
row += 1 | |
else: | |
raise NotImplementedError("Only 2,3,4,8 bits are supported.") | |
qweight = qweight.astype(np.int32) | |
self.qweight = torch.from_numpy(qweight) | |
zeros -= 1 | |
zeros = zeros.numpy().astype(np.uint32) | |
qzeros = np.zeros((zeros.shape[0], zeros.shape[1] // 32 * self.bits), dtype=np.uint32) | |
i = 0 | |
col = 0 | |
while col < qzeros.shape[1]: | |
if self.bits in [2, 4, 8]: | |
for j in range(i, i + (32 // self.bits)): | |
qzeros[:, col] |= zeros[:, j] << (self.bits * (j - i)) | |
i += 32 // self.bits | |
col += 1 | |
elif self.bits == 3: | |
for j in range(i, i + 10): | |
qzeros[:, col] |= zeros[:, j] << (3 * (j - i)) | |
i += 10 | |
qzeros[:, col] |= zeros[:, i] << 30 | |
col += 1 | |
qzeros[:, col] |= (zeros[:, i] >> 2) & 1 | |
i += 1 | |
for j in range(i, i + 10): | |
qzeros[:, col] |= zeros[:, j] << (3 * (j - i) + 1) | |
i += 10 | |
qzeros[:, col] |= zeros[:, i] << 31 | |
col += 1 | |
qzeros[:, col] |= (zeros[:, i] >> 1) & 0x3 | |
i += 1 | |
for j in range(i, i + 10): | |
qzeros[:, col] |= zeros[:, j] << (3 * (j - i) + 2) | |
i += 10 | |
col += 1 | |
else: | |
raise NotImplementedError("Only 2,3,4,8 bits are supported.") | |
qzeros = qzeros.astype(np.int32) | |
self.qzeros = torch.from_numpy(qzeros) | |
def forward(self, x): | |
x_dtype = x.dtype | |
out_shape = x.shape[:-1] + (self.outfeatures,) | |
x = x.reshape(-1, x.shape[-1]) | |
if ( | |
x.device.type == "cuda" | |
and self.autogptq_cuda_available is True | |
and (self.kernel_switch_threshold is False or x.shape[0] < self.kernel_switch_threshold) | |
): | |
out = torch.zeros(x.shape[0], out_shape[-1], dtype=torch.float, device=x.device) | |
if self.use_cuda_fp16: | |
if x_dtype != torch.float16: | |
logger.warning_once( | |
f"The cuda-old kernel for GPTQ with use_cuda_fp16=True requires a float16 input activation, while {x_dtype} was passed. Casting to float16.\nMake sure you loaded your model with torch_dtype=torch.float16, that the model definition does not inadvertently cast to float32, or disable AMP Autocast that may produce float32 intermediate activations in the model." | |
) | |
if self.bits == 2: | |
self.autogptq_cuda.vecquant2matmul_faster_old( | |
x, | |
self.qweight, | |
out, | |
self.scales.float(), | |
self.qzeros, | |
self.group_size, | |
self.half_indim, | |
) | |
elif self.bits == 3: | |
self.autogptq_cuda.vecquant3matmul_faster_old( | |
x, | |
self.qweight, | |
out, | |
self.scales.float(), | |
self.qzeros, | |
self.group_size, | |
self.half_indim, | |
) | |
elif self.bits == 4: | |
self.autogptq_cuda.vecquant4matmul_faster_old( | |
x, | |
self.qweight, | |
out, | |
self.scales.float(), | |
self.qzeros, | |
self.group_size, | |
self.half_indim, | |
) | |
else: | |
raise NotImplementedError("Only 2,3,4 bits are supported.") | |
else: | |
x = x.to(torch.float32) # This is required for autocast compatibility. | |
if self.bits == 2: | |
self.autogptq_cuda.vecquant2matmul_old( | |
x, | |
self.qweight, | |
out, | |
self.scales.float(), | |
self.qzeros, | |
self.group_size, | |
) | |
elif self.bits == 3: | |
self.autogptq_cuda.vecquant3matmul_old( | |
x, | |
self.qweight, | |
out, | |
self.scales.float(), | |
self.qzeros, | |
self.group_size, | |
) | |
elif self.bits == 4: | |
self.autogptq_cuda.vecquant4matmul_old( | |
x, | |
self.qweight, | |
out, | |
self.scales.float(), | |
self.qzeros, | |
self.group_size, | |
) | |
elif self.bits == 8: | |
self.autogptq_cuda.vecquant8matmul_old( | |
x, | |
self.qweight, | |
out, | |
self.scales.float(), | |
self.qzeros, | |
self.group_size, | |
) | |
else: | |
raise NotImplementedError("Only 2,3,4,8 bits are supported.") | |
else: | |
if self.wf.device != self.qzeros.device: | |
self.wf = self.wf.to(self.qzeros.device) | |
if self.bits in [2, 4, 8]: | |
zeros = torch.bitwise_right_shift( | |
torch.unsqueeze(self.qzeros, 2).expand(-1, -1, 32 // self.bits), | |
self.wf.unsqueeze(0), | |
).to(torch.int16 if self.bits == 8 else torch.int8) | |
zeros = zeros + 1 | |
zeros = torch.bitwise_and( | |
zeros, (2**self.bits) - 1 | |
) # NOTE: It appears that casting here after the `zeros = zeros + 1` is important. | |
zeros = zeros.reshape(-1, 1, zeros.shape[1] * zeros.shape[2]) | |
scales = self.scales | |
scales = scales.reshape(-1, 1, scales.shape[-1]) | |
weight = torch.bitwise_right_shift( | |
torch.unsqueeze(self.qweight, 1).expand(-1, 32 // self.bits, -1), | |
self.wf.unsqueeze(-1), | |
).to(torch.int16 if self.bits == 8 else torch.int8) | |
weight = torch.bitwise_and(weight, (2**self.bits) - 1) | |
weight = weight.reshape(-1, self.group_size, weight.shape[2]) | |
elif self.bits == 3: | |
zeros = self.qzeros.reshape(self.qzeros.shape[0], self.qzeros.shape[1] // 3, 3, 1).expand( | |
-1, -1, -1, 12 | |
) | |
zeros = zeros >> self.wf.unsqueeze(0) | |
zeros[:, :, 0, 10] = (zeros[:, :, 0, 10] & 0x3) | ((zeros[:, :, 1, 0] << 2) & 0x4) | |
zeros[:, :, 1, 11] = (zeros[:, :, 1, 11] & 0x1) | ((zeros[:, :, 2, 0] << 1) & 0x6) | |
zeros = zeros & 0x7 | |
zeros = torch.cat( | |
[zeros[:, :, 0, :11], zeros[:, :, 1, 1:12], zeros[:, :, 2, 1:11]], | |
dim=2, | |
) | |
zeros = zeros + 1 | |
zeros = zeros.reshape(-1, 1, zeros.shape[1] * zeros.shape[2]) | |
scales = self.scales | |
scales = scales.reshape(-1, 1, scales.shape[-1]) | |
weight = self.qweight.reshape(self.qweight.shape[0] // 3, 3, 1, self.qweight.shape[1]).expand( | |
-1, -1, 12, -1 | |
) | |
weight = (weight >> self.wf.unsqueeze(-1)) & 0x7 | |
weight[:, 0, 10] = (weight[:, 0, 10] & 0x3) | ((weight[:, 1, 0] << 2) & 0x4) | |
weight[:, 1, 11] = (weight[:, 1, 11] & 0x1) | ((weight[:, 2, 0] << 1) & 0x6) | |
weight = weight & 0x7 | |
weight = torch.cat([weight[:, 0, :11], weight[:, 1, 1:12], weight[:, 2, 1:11]], dim=1) | |
weight = weight.reshape(-1, self.group_size, weight.shape[2]) | |
else: | |
raise NotImplementedError("Only 2,3,4,8 bits are supported.") | |
weight = scales * (weight - zeros) | |
weight = weight.reshape(weight.shape[0] * weight.shape[1], weight.shape[2]) | |
out = torch.matmul(x, weight) | |
out = out.to(dtype=x_dtype).reshape( | |
out_shape | |
) # A cast is needed here as for some reason the vecquant2matmul_faster_old still allocate a float32 output. | |
out = out + self.bias if self.bias is not None else out | |
return out | |
__all__ = ["QuantLinear"] | |