248 lines
11 KiB
Python
248 lines
11 KiB
Python
import functools
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import torch.nn as nn
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import torch
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import numpy as np
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from modules import SharedMLP, PVConv, PointNetSAModule, PointNetAModule, PointNetFPModule, Attention, Swish
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def _linear_gn_relu(in_channels, out_channels):
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return nn.Sequential(nn.Linear(in_channels, out_channels), nn.GroupNorm(8,out_channels), Swish())
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def create_mlp_components(in_channels, out_channels, classifier=False, dim=2, width_multiplier=1):
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r = width_multiplier
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if dim == 1:
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block = _linear_gn_relu
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else:
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block = SharedMLP
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if not isinstance(out_channels, (list, tuple)):
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out_channels = [out_channels]
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if len(out_channels) == 0 or (len(out_channels) == 1 and out_channels[0] is None):
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return nn.Sequential(), in_channels, in_channels
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layers = []
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for oc in out_channels[:-1]:
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if oc < 1:
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layers.append(nn.Dropout(oc))
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else:
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oc = int(r * oc)
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layers.append(block(in_channels, oc))
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in_channels = oc
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if dim == 1:
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if classifier:
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layers.append(nn.Linear(in_channels, out_channels[-1]))
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else:
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layers.append(_linear_gn_relu(in_channels, int(r * out_channels[-1])))
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else:
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if classifier:
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layers.append(nn.Conv1d(in_channels, out_channels[-1], 1))
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else:
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layers.append(SharedMLP(in_channels, int(r * out_channels[-1])))
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return layers, out_channels[-1] if classifier else int(r * out_channels[-1])
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def create_pointnet_components(blocks, in_channels, embed_dim, with_se=False, normalize=True, eps=0,
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width_multiplier=1, voxel_resolution_multiplier=1):
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r, vr = width_multiplier, voxel_resolution_multiplier
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layers, concat_channels = [], 0
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c = 0
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for k, (out_channels, num_blocks, voxel_resolution) in enumerate(blocks):
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out_channels = int(r * out_channels)
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for p in range(num_blocks):
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attention = k % 2 == 0 and k > 0 and p == 0
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if voxel_resolution is None:
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block = SharedMLP
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else:
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block = functools.partial(PVConv, kernel_size=3, resolution=int(vr * voxel_resolution), attention=attention,
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with_se=with_se, normalize=normalize, eps=eps)
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if c == 0:
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layers.append(block(in_channels, out_channels))
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else:
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layers.append(block(in_channels+embed_dim, out_channels))
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in_channels = out_channels
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concat_channels += out_channels
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c += 1
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return layers, in_channels, concat_channels
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def create_pointnet2_sa_components(sa_blocks, extra_feature_channels, embed_dim=64, use_att=False,
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dropout=0.1, with_se=False, normalize=True, eps=0,
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width_multiplier=1, voxel_resolution_multiplier=1):
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r, vr = width_multiplier, voxel_resolution_multiplier
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in_channels = extra_feature_channels + 3
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sa_layers, sa_in_channels = [], []
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c = 0
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for conv_configs, sa_configs in sa_blocks:
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k = 0
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sa_in_channels.append(in_channels)
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sa_blocks = []
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if conv_configs is not None:
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out_channels, num_blocks, voxel_resolution = conv_configs
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out_channels = int(r * out_channels)
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for p in range(num_blocks):
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attention = (c+1) % 2 == 0 and use_att and p == 0
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if voxel_resolution is None:
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block = SharedMLP
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else:
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block = functools.partial(PVConv, kernel_size=3, resolution=int(vr * voxel_resolution), attention=attention,
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dropout=dropout,
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with_se=with_se, with_se_relu=True,
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normalize=normalize, eps=eps)
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if c == 0:
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sa_blocks.append(block(in_channels, out_channels))
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elif k ==0:
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sa_blocks.append(block(in_channels+embed_dim, out_channels))
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in_channels = out_channels
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k += 1
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extra_feature_channels = in_channels
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num_centers, radius, num_neighbors, out_channels = sa_configs
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_out_channels = []
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for oc in out_channels:
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if isinstance(oc, (list, tuple)):
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_out_channels.append([int(r * _oc) for _oc in oc])
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else:
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_out_channels.append(int(r * oc))
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out_channels = _out_channels
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if num_centers is None:
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block = PointNetAModule
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else:
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block = functools.partial(PointNetSAModule, num_centers=num_centers, radius=radius,
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num_neighbors=num_neighbors)
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sa_blocks.append(block(in_channels=extra_feature_channels+(embed_dim if k==0 else 0 ), out_channels=out_channels,
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include_coordinates=True))
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c += 1
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in_channels = extra_feature_channels = sa_blocks[-1].out_channels
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if len(sa_blocks) == 1:
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sa_layers.append(sa_blocks[0])
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else:
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sa_layers.append(nn.Sequential(*sa_blocks))
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return sa_layers, sa_in_channels, in_channels, 1 if num_centers is None else num_centers
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def create_pointnet2_fp_modules(fp_blocks, in_channels, sa_in_channels, embed_dim=64, use_att=False,
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dropout=0.1,
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with_se=False, normalize=True, eps=0,
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width_multiplier=1, voxel_resolution_multiplier=1):
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r, vr = width_multiplier, voxel_resolution_multiplier
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fp_layers = []
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c = 0
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for fp_idx, (fp_configs, conv_configs) in enumerate(fp_blocks):
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fp_blocks = []
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out_channels = tuple(int(r * oc) for oc in fp_configs)
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fp_blocks.append(
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PointNetFPModule(in_channels=in_channels + sa_in_channels[-1 - fp_idx] + embed_dim, out_channels=out_channels)
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)
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in_channels = out_channels[-1]
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if conv_configs is not None:
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out_channels, num_blocks, voxel_resolution = conv_configs
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out_channels = int(r * out_channels)
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for p in range(num_blocks):
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attention = (c+1) % 2 == 0 and c < len(fp_blocks) - 1 and use_att and p == 0
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if voxel_resolution is None:
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block = SharedMLP
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else:
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block = functools.partial(PVConv, kernel_size=3, resolution=int(vr * voxel_resolution), attention=attention,
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dropout=dropout,
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with_se=with_se, with_se_relu=True,
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normalize=normalize, eps=eps)
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fp_blocks.append(block(in_channels, out_channels))
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in_channels = out_channels
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if len(fp_blocks) == 1:
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fp_layers.append(fp_blocks[0])
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else:
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fp_layers.append(nn.Sequential(*fp_blocks))
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c += 1
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return fp_layers, in_channels
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class PVCNN2Base(nn.Module):
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def __init__(self, num_classes, embed_dim, use_att, dropout=0.1,
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extra_feature_channels=3, width_multiplier=1, voxel_resolution_multiplier=1):
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super().__init__()
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assert extra_feature_channels >= 0
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self.embed_dim = embed_dim
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self.in_channels = extra_feature_channels + 3
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sa_layers, sa_in_channels, channels_sa_features, _ = create_pointnet2_sa_components(
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sa_blocks=self.sa_blocks, extra_feature_channels=extra_feature_channels, with_se=True, embed_dim=embed_dim,
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use_att=use_att, dropout=dropout,
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width_multiplier=width_multiplier, voxel_resolution_multiplier=voxel_resolution_multiplier
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)
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self.sa_layers = nn.ModuleList(sa_layers)
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self.global_att = None if not use_att else Attention(channels_sa_features, 8, D=1)
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# only use extra features in the last fp module
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sa_in_channels[0] = extra_feature_channels
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fp_layers, channels_fp_features = create_pointnet2_fp_modules(
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fp_blocks=self.fp_blocks, in_channels=channels_sa_features, sa_in_channels=sa_in_channels, with_se=True, embed_dim=embed_dim,
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use_att=use_att, dropout=dropout,
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width_multiplier=width_multiplier, voxel_resolution_multiplier=voxel_resolution_multiplier
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)
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self.fp_layers = nn.ModuleList(fp_layers)
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layers, _ = create_mlp_components(in_channels=channels_fp_features, out_channels=[128, dropout, num_classes], # was 0.5
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classifier=True, dim=2, width_multiplier=width_multiplier)
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self.classifier = nn.Sequential(*layers)
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self.embedf = nn.Sequential(
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nn.Linear(embed_dim, embed_dim),
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nn.LeakyReLU(0.1, inplace=True),
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nn.Linear(embed_dim, embed_dim),
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)
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def get_timestep_embedding(self, timesteps, device):
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assert len(timesteps.shape) == 1 # and timesteps.dtype == tf.int32
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half_dim = self.embed_dim // 2
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emb = np.log(10000) / (half_dim - 1)
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emb = torch.from_numpy(np.exp(np.arange(0, half_dim) * -emb)).float().to(device)
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# emb = tf.range(num_embeddings, dtype=DEFAULT_DTYPE)[:, None] * emb[None, :]
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emb = timesteps[:, None] * emb[None, :]
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emb = torch.cat([torch.sin(emb), torch.cos(emb)], dim=1)
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if self.embed_dim % 2 == 1: # zero pad
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# emb = tf.concat([emb, tf.zeros([num_embeddings, 1])], axis=1)
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emb = nn.functional.pad(emb, (0, 1), "constant", 0)
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assert emb.shape == torch.Size([timesteps.shape[0], self.embed_dim])
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return emb
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def forward(self, inputs, t):
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temb = self.embedf(self.get_timestep_embedding(t, inputs.device))[:,:,None].expand(-1,-1,inputs.shape[-1])
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# inputs : [B, in_channels + S, N]
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coords, features = inputs[:, :3, :].contiguous(), inputs
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coords_list, in_features_list = [], []
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for i, sa_blocks in enumerate(self.sa_layers):
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in_features_list.append(features)
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coords_list.append(coords)
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if i == 0:
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features, coords, temb = sa_blocks ((features, coords, temb))
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else:
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features, coords, temb = sa_blocks ((torch.cat([features,temb],dim=1), coords, temb))
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in_features_list[0] = inputs[:, 3:, :].contiguous()
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if self.global_att is not None:
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features = self.global_att(features)
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for fp_idx, fp_blocks in enumerate(self.fp_layers):
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features, coords, temb = fp_blocks((coords_list[-1-fp_idx], coords, torch.cat([features,temb],dim=1), in_features_list[-1-fp_idx], temb))
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return self.classifier(features)
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