mirror of
https://github.com/wassname/Pointnet2_PyTorch.git
synced 2026-06-27 16:00:07 +08:00
wassname
144 lines
4.5 KiB
Python
144 lines
4.5 KiB
Python
import os, sys
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BASE_DIR = os.path.dirname(os.path.abspath(__file__))
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sys.path.append(BASE_DIR)
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sys.path.append(os.path.join(BASE_DIR, "../utils"))
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import torch
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import torch.nn as nn
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from torch.autograd import Variable
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import pytorch_utils as pt_utils
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from pointnet2_modules import PointnetSAModule, PointnetFPModule, PointnetSAModuleMSG
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from pointnet2_utils import RandomDropout
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from collections import namedtuple
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def model_fn_decorator(criterion):
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ModelReturn = namedtuple("ModelReturn", ['preds', 'loss', 'acc'])
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def model_fn(model, data, epoch=0, eval=False):
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inputs, labels = data
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inputs = Variable(inputs.cuda(async=True), volatile=eval)
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labels = Variable(labels.cuda(async=True), volatile=eval)
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xyz = inputs[..., :3]
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if inputs.size(2) > 3:
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points = inputs[..., 3:]
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else:
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points = None
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preds = model(xyz, points)
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loss = criterion(preds.view(labels.numel(), -1), labels.view(-1))
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_, classes = torch.max(preds.data, 2)
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acc = (classes == labels.data).sum() / labels.numel()
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return ModelReturn(preds, loss, {"acc": acc})
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return model_fn
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class Pointnet2SSG(nn.Module):
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def __init__(self, num_classes, input_channels=3, use_xyz=True):
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super().__init__()
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self.SA_modules = nn.ModuleList()
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self.SA_modules.append(
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PointnetSAModule(
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npoint=1024,
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radius=0.1,
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nsample=32,
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mlp=[input_channels, 32, 32, 64],
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use_xyz=use_xyz
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)
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)
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self.SA_modules.append(
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PointnetSAModule(
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npoint=256, radius=0.2, nsample=32, mlp=[64, 64, 64, 128]
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)
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)
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self.SA_modules.append(
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PointnetSAModule(
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npoint=64, radius=0.4, nsample=32, mlp=[128, 128, 128, 256]
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)
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)
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self.SA_modules.append(
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PointnetSAModule(
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npoint=16, radius=0.8, nsample=32, mlp=[256, 256, 256, 512]
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)
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)
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self.FP_modules = nn.ModuleList()
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self.FP_modules.append(
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PointnetFPModule(mlp=[128 + (input_channels if use_xyz else 0), 128, 128, 128])
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)
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self.FP_modules.append(PointnetFPModule(mlp=[256 + 64, 256, 128]))
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self.FP_modules.append(PointnetFPModule(mlp=[256 + 128, 256, 256]))
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self.FP_modules.append(PointnetFPModule(mlp=[512 + 256, 256, 256]))
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self.FC_layer = nn.Sequential(
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pt_utils.Conv1d(128, 128, bn=True), nn.Dropout(),
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pt_utils.Conv1d(128, num_classes, activation=None)
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)
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def forward(self, xyz, points=None):
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xyz = xyz.contiguous()
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points = (
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points.transpose(1, 2).contiguous() if points is not None else None
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)
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l_xyz, l_points = [xyz], [points]
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for i in range(len(self.SA_modules)):
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li_xyz, li_points = self.SA_modules[i](l_xyz[i], l_points[i])
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l_xyz.append(li_xyz)
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l_points.append(li_points)
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for i in range(-1, -(len(self.FP_modules) + 1), -1):
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l_points[i - 1] = self.FP_modules[i](
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l_xyz[i - 1], l_xyz[i], l_points[i - 1], l_points[i]
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)
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return self.FC_layer(l_points[0]).transpose(1, 2).contiguous()
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if __name__ == "__main__":
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from torch.autograd import Variable
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import numpy as np
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import torch.optim as optim
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B = 2
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N = 32
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inputs = torch.randn(B, N, 6).cuda()
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labels = torch.from_numpy(np.random.randint(0, 3,
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size=B * N)).view(B, N).cuda()
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model = Pointnet2SSG(3, input_channels=3)
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model.cuda()
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optimizer = optim.Adam(model.parameters(), lr=1e-2)
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model_fn = model_fn_decorator(nn.CrossEntropyLoss())
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for _ in range(20):
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optimizer.zero_grad()
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_, loss, _ = model_fn(model, (inputs, labels))
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loss.backward()
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print(loss.data[0])
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optimizer.step()
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# try with use_xyz=False too
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inputs = torch.randn(B, N, 3).cuda()
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labels = torch.from_numpy(np.random.randint(0, 3,
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size=B * N)).view(B, N).cuda()
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model = Pointnet2SSG(3, input_channels=3, use_xyz=False)
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model.cuda()
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optimizer = optim.Adam(model.parameters(), lr=1e-2)
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model_fn = model_fn_decorator(nn.CrossEntropyLoss())
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for _ in range(20):
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optimizer.zero_grad()
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_, loss, _ = model_fn(model, (inputs, labels))
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loss.backward()
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print(loss.data[0])
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optimizer.step()
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