Add several speedup examples (#3880)

examples/model_compress/pruning/model_speedup.py → examples/model_compress/pruning/speedup/model_speedup.py

@@ -7,7 +7,7 @@
 from torchvision import datasets, transforms
 
 import sys
-sys.path.append('../models')
+sys.path.append('../../models')
 from cifar10.vgg import VGG
 from mnist.lenet import LeNet
 

examples/model_compress/pruning/speedup/speedup_mobilnetv2.py

@@ -0,0 +1,21 @@
+import torch
+from torchvision.models import mobilenet_v2
+from nni.compression.pytorch import ModelSpeedup
+from nni.algorithms.compression.pytorch.pruning import L1FilterPruner
+
+
+model = mobilenet_v2(pretrained=True)
+dummy_input  = torch.rand(8, 3, 416, 416)
+
+cfg_list = [{'op_types':['Conv2d'], 'sparsity':0.5}]
+pruner = L1FilterPruner(model, cfg_list)
+pruner.compress()
+pruner.export_model('./model', './mask')
+# need call _unwrap_model if you want run the speedup on the same model
+pruner._unwrap_model()
+
+# Speedup the nanodet
+ms = ModelSpeedup(model, dummy_input, './mask')
+ms.speedup_model()
+
+model(dummy_input)

examples/model_compress/pruning/speedup/speedup_nanodet.py

@@ -0,0 +1,39 @@
+import torch                                                                                                                                                                                                                                                                                                                                          
+from nanodet.model.arch import build_model                                                                                                                                                                                                                                                                                                            
+from nanodet.util import cfg, load_config                                                                                                                                                                                                                                                                  
+
+from nni.compression.pytorch import ModelSpeedup
+from nni.algorithms.compression.pytorch.pruning import L1FilterPruner
+
+"""
+NanoDet model can be installed from https://github.com/RangiLyu/nanodet.git
+"""
+
+cfg_path = r"nanodet/config/nanodet-RepVGG-A0_416.yml"
+load_config(cfg, cfg_path)
+
+model = build_model(cfg.model)
+dummy_input  = torch.rand(8, 3, 416, 416)
+
+op_names = []
+# these three conv layers are followed by reshape-like functions
+# that cannot be replaced, so we skip these three conv layers,
+# you can also get such layers by `not_safe_to_prune` function
+excludes = ['head.gfl_cls.0', 'head.gfl_cls.1', 'head.gfl_cls.2']
+for name, module in model.named_modules():
+    if isinstance(module, torch.nn.Conv2d):
+        if name not in excludes:
+            op_names.append(name)
+
+cfg_list = [{'op_types':['Conv2d'], 'sparsity':0.5, 'op_names':op_names}]
+pruner = L1FilterPruner(model, cfg_list)
+pruner.compress()
+pruner.export_model('./model', './mask')
+# need call _unwrap_model if you want run the speedup on the same model
+pruner._unwrap_model()
+
+# Speedup the nanodet
+ms = ModelSpeedup(model, dummy_input, './mask')
+ms.speedup_model()
+
+model(dummy_input)

examples/model_compress/pruning/speedup/speedup_yolov3.py

@@ -0,0 +1,36 @@
+import torch
+from pytorchyolo import models
+
+from nni.compression.pytorch import ModelSpeedup
+from nni.algorithms.compression.pytorch.pruning import L1FilterPruner, LevelPruner
+from nni.compression.pytorch.utils import not_safe_to_prune
+
+# The Yolo can be downloaded at https://github.com/eriklindernoren/PyTorch-YOLOv3.git
+prefix = '/home/user/PyTorch-YOLOv3' # replace this path with yours
+# Load the YOLO model
+model = models.load_model(
+  "%s/config/yolov3.cfg" % prefix, 
+  "%s/yolov3.weights" % prefix)
+model.eval()
+dummy_input = torch.rand(8, 3, 320, 320)
+model(dummy_input)
+# Generate the config list for pruner
+# Filter the layers that may not be able to prune
+not_safe = not_safe_to_prune(model, dummy_input)
+cfg_list = []
+for name, module in model.named_modules():
+  if name in not_safe:
+    continue
+  if isinstance(module, torch.nn.Conv2d):
+    cfg_list.append({'op_types':['Conv2d'], 'sparsity':0.6, 'op_names':[name]})
+# Prune the model
+pruner = L1FilterPruner(model, cfg_list)
+pruner.compress()
+pruner.export_model('./model', './mask')
+pruner._unwrap_model()
+# Speedup the model
+ms = ModelSpeedup(model, dummy_input, './mask')
+
+ms.speedup_model()
+model(dummy_input)
+

nni/compression/pytorch/utils/utils.py

@@ -70,7 +70,14 @@ def randomize_tensor(tensor, start=1, end=100):
 
 def not_safe_to_prune(model, dummy_input):
     """
-    Get the layers that are safe to prune(will not bring the shape conflict).
+    Get the layers that are not safe to prune(may bring the shape conflict).
+    For example, if the output tensor of a conv layer is directly followed by
+    a shape-dependent function(such as reshape/view), then this conv layer
+    may be not safe to be pruned. Pruning may change the output shape of
+    this conv layer and result in shape problems. This function find all the
+    layers that directly followed by the shape-dependent functions(view, reshape, etc).
+    If you run the inference after the speedup and run into a shape related error,
+    please exclude the layers returned by this function and try again.
 
     Parameters
     ----------

test/ut/sdk/test_model_speedup.py

@@ -361,6 +361,10 @@ def test_speedup_integration_big(self):
         self.speedup_integration(model_list)
 
     def speedup_integration(self, model_list, speedup_cfg=None):
+        # Note: hack trick, may be updated in the future
+        if 'win' in sys.platform or 'Win'in sys.platform:
+            print('Skip test_speedup_integration on windows due to memory limit!')
+            return
         Gen_cfg_funcs = [generate_random_sparsity, generate_random_sparsity_v2]
 
         # for model_name in ['vgg16', 'resnet18', 'mobilenet_v2', 'squeezenet1_1', 'densenet121',