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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,3 +1,3 @@ | ||
| __version__: "2.4.0.dev0" | ||
| __cuda_version__: "12.1" | ||
| __tensorrt_version__: "10.0.1" | ||
| __tensorrt_version__: "10.0.1" |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,251 @@ | ||
| """ | ||
| .. _vgg16_fp8_ptq: | ||
| Torch Compile VGG16 with FP8 and PTQ | ||
| ====================================================== | ||
| This script is intended as a sample of the Torch-TensorRT workflow with `torch.compile` on a VGG16 model with FP8 and PTQ. | ||
| """ | ||
|
|
||
| # %% | ||
| # Imports and Model Definition | ||
| # ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | ||
|
|
||
| import argparse | ||
|
|
||
| import modelopt.torch.quantization as mtq | ||
| import torch | ||
| import torch.nn as nn | ||
| import torch.nn.functional as F | ||
| import torch_tensorrt as torchtrt | ||
| import torchvision.datasets as datasets | ||
| import torchvision.transforms as transforms | ||
| from modelopt.torch.quantization.utils import export_torch_mode | ||
|
|
||
|
|
||
| class VGG(nn.Module): | ||
| def __init__(self, layer_spec, num_classes=1000, init_weights=False): | ||
| super(VGG, self).__init__() | ||
|
|
||
| layers = [] | ||
| in_channels = 3 | ||
| for l in layer_spec: | ||
| if l == "pool": | ||
| layers.append(nn.MaxPool2d(kernel_size=2, stride=2)) | ||
| else: | ||
| layers += [ | ||
| nn.Conv2d(in_channels, l, kernel_size=3, padding=1), | ||
| nn.BatchNorm2d(l), | ||
| nn.ReLU(), | ||
| ] | ||
| in_channels = l | ||
|
|
||
| self.features = nn.Sequential(*layers) | ||
| self.avgpool = nn.AdaptiveAvgPool2d((1, 1)) | ||
| self.classifier = nn.Sequential( | ||
| nn.Linear(512 * 1 * 1, 4096), | ||
| nn.ReLU(), | ||
| nn.Dropout(), | ||
| nn.Linear(4096, 4096), | ||
| nn.ReLU(), | ||
| nn.Dropout(), | ||
| nn.Linear(4096, num_classes), | ||
| ) | ||
| if init_weights: | ||
| self._initialize_weights() | ||
|
|
||
| def _initialize_weights(self): | ||
| for m in self.modules(): | ||
| if isinstance(m, nn.Conv2d): | ||
| nn.init.kaiming_normal_(m.weight, mode="fan_out", nonlinearity="relu") | ||
| if m.bias is not None: | ||
| nn.init.constant_(m.bias, 0) | ||
| elif isinstance(m, nn.BatchNorm2d): | ||
| nn.init.constant_(m.weight, 1) | ||
| nn.init.constant_(m.bias, 0) | ||
| elif isinstance(m, nn.Linear): | ||
| nn.init.normal_(m.weight, 0, 0.01) | ||
| nn.init.constant_(m.bias, 0) | ||
|
|
||
| def forward(self, x): | ||
| x = self.features(x) | ||
| x = self.avgpool(x) | ||
| x = torch.flatten(x, 1) | ||
| x = self.classifier(x) | ||
| return x | ||
|
|
||
|
|
||
| def vgg16(num_classes=1000, init_weights=False): | ||
| vgg16_cfg = [ | ||
| 64, | ||
| 64, | ||
| "pool", | ||
| 128, | ||
| 128, | ||
| "pool", | ||
| 256, | ||
| 256, | ||
| 256, | ||
| "pool", | ||
| 512, | ||
| 512, | ||
| 512, | ||
| "pool", | ||
| 512, | ||
| 512, | ||
| 512, | ||
| "pool", | ||
| ] | ||
| return VGG(vgg16_cfg, num_classes, init_weights) | ||
|
|
||
|
|
||
| PARSER = argparse.ArgumentParser( | ||
| description="Load pre-trained VGG model and then tune with FP8 and PTQ" | ||
| ) | ||
| PARSER.add_argument( | ||
| "--ckpt", type=str, required=True, help="Path to the pre-trained checkpoint" | ||
| ) | ||
| PARSER.add_argument( | ||
| "--batch-size", | ||
| default=128, | ||
| type=int, | ||
| help="Batch size for tuning the model with PTQ and FP8", | ||
| ) | ||
|
|
||
| args = PARSER.parse_args() | ||
|
|
||
| model = vgg16(num_classes=10, init_weights=False) | ||
| model = model.cuda() | ||
|
|
||
| # %% | ||
| # Load the pre-trained model weights | ||
| # ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | ||
|
|
||
| ckpt = torch.load(args.ckpt) | ||
| weights = ckpt["model_state_dict"] | ||
|
|
||
| if torch.cuda.device_count() > 1: | ||
| from collections import OrderedDict | ||
|
|
||
| new_state_dict = OrderedDict() | ||
| for k, v in weights.items(): | ||
| name = k[7:] # remove `module.` | ||
| new_state_dict[name] = v | ||
| weights = new_state_dict | ||
|
|
||
| model.load_state_dict(weights) | ||
| # Don't forget to set the model to evaluation mode! | ||
| model.eval() | ||
|
|
||
| # %% | ||
| # Load training dataset and define loss function for PTQ | ||
| # ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | ||
|
|
||
| training_dataset = datasets.CIFAR10( | ||
| root="./data", | ||
| train=True, | ||
| download=True, | ||
| transform=transforms.Compose( | ||
| [ | ||
| transforms.RandomCrop(32, padding=4), | ||
| transforms.RandomHorizontalFlip(), | ||
| transforms.ToTensor(), | ||
| transforms.Normalize((0.4914, 0.4822, 0.4465), (0.2023, 0.1994, 0.2010)), | ||
| ] | ||
| ), | ||
| ) | ||
| training_dataloader = torch.utils.data.DataLoader( | ||
| training_dataset, batch_size=args.batch_size, shuffle=True, num_workers=2 | ||
| ) | ||
|
|
||
| data = iter(training_dataloader) | ||
| images, _ = next(data) | ||
|
|
||
| crit = nn.CrossEntropyLoss() | ||
|
|
||
| # %% | ||
| # Define Calibration Loop for quantization | ||
| # ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | ||
|
|
||
|
|
||
| def calibrate_loop(model): | ||
| # calibrate over the training dataset | ||
| total = 0 | ||
| correct = 0 | ||
| loss = 0.0 | ||
| for data, labels in training_dataloader: | ||
| data, labels = data.cuda(), labels.cuda(non_blocking=True) | ||
| out = model(data) | ||
| loss += crit(out, labels) | ||
| preds = torch.max(out, 1)[1] | ||
| total += labels.size(0) | ||
| correct += (preds == labels).sum().item() | ||
|
|
||
| print("PTQ Loss: {:.5f} Acc: {:.2f}%".format(loss / total, 100 * correct / total)) | ||
|
|
||
|
|
||
| # %% | ||
| # Tune the pre-trained model with FP8 and PTQ | ||
| # ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | ||
|
|
||
| quant_cfg = mtq.FP8_DEFAULT_CFG | ||
| # PTQ with in-place replacement to quantized modules | ||
| mtq.quantize(model, quant_cfg, forward_loop=calibrate_loop) | ||
| # model has FP8 qdq nodes at this point | ||
|
|
||
| # %% | ||
| # Inference | ||
| # ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | ||
|
|
||
| # Load the testing dataset | ||
| testing_dataset = datasets.CIFAR10( | ||
| root="./data", | ||
| train=False, | ||
| download=True, | ||
| transform=transforms.Compose( | ||
| [ | ||
| transforms.ToTensor(), | ||
| transforms.Normalize((0.4914, 0.4822, 0.4465), (0.2023, 0.1994, 0.2010)), | ||
| ] | ||
| ), | ||
| ) | ||
|
|
||
| testing_dataloader = torch.utils.data.DataLoader( | ||
| testing_dataset, batch_size=args.batch_size, shuffle=False, num_workers=2 | ||
| ) | ||
|
|
||
| with torch.no_grad(): | ||
| with export_torch_mode(): | ||
| # Compile the model with Torch-TensorRT Dynamo backend | ||
| input_tensor = images.cuda() | ||
| exp_program = torch.export.export(model, (input_tensor,)) | ||
| trt_model = torchtrt.dynamo.compile( | ||
| exp_program, | ||
| inputs=[input_tensor], | ||
| enabled_precisions={torch.float8_e4m3fn}, | ||
| min_block_size=1, | ||
| debug=False, | ||
| ) | ||
|
|
||
| # Inference compiled Torch-TensorRT model over the testing dataset | ||
| total = 0 | ||
| correct = 0 | ||
| loss = 0.0 | ||
| class_probs = [] | ||
| class_preds = [] | ||
| model.eval() | ||
| for data, labels in testing_dataloader: | ||
| data, labels = data.cuda(), labels.cuda(non_blocking=True) | ||
| out = model(data) | ||
| loss += crit(out, labels) | ||
| preds = torch.max(out, 1)[1] | ||
| class_probs.append([F.softmax(i, dim=0) for i in out]) | ||
| class_preds.append(preds) | ||
| total += labels.size(0) | ||
| correct += (preds == labels).sum().item() | ||
|
|
||
| test_probs = torch.cat([torch.stack(batch) for batch in class_probs]) | ||
| test_preds = torch.cat(class_preds) | ||
| test_loss = loss / total | ||
| test_acc = correct / total | ||
| print("Test Loss: {:.5f} Test Acc: {:.2f}%".format(test_loss, 100 * test_acc)) |
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