cnn.py

import torch
import torch.nn as nn


def tie_weights(src, trg):
    assert type(src) == type(trg)
    trg.weight = src.weight
    trg.bias = src.bias


OUT_DIM = {2: 39, 4: 35, 6: 31}

class PixelCNN(nn.Module):
    """Convolutional encoder of pixels observations."""
    def __init__(self, obs_shape, feature_dim, num_layers=2, num_filters=32):
        super().__init__()

        assert len(obs_shape) == 3

        self.feature_dim = feature_dim
        self.num_layers = num_layers

        self.convs = nn.ModuleList(
            [nn.Conv2d(obs_shape[0], num_filters, 3, stride=2)]
        )
        for i in range(num_layers - 1):
            self.convs.append(nn.Conv2d(num_filters, num_filters, 3, stride=1))

        out_dim = OUT_DIM[num_layers]
        self.fc = nn.Linear(num_filters * out_dim * out_dim, self.feature_dim)
        self.ln = nn.LayerNorm(self.feature_dim)

        self.outputs = dict()

    def reparameterize(self, mu, logstd):
        std = torch.exp(logstd)
        eps = torch.randn_like(std)
        return mu + eps * std

    def forward_conv(self, obs):
        obs = obs / 255.
        self.outputs['obs'] = obs

        conv = torch.relu(self.convs[0](obs))
        self.outputs['conv1'] = conv

        for i in range(1, self.num_layers):
            conv = torch.relu(self.convs[i](conv))
            self.outputs['conv%s' % (i + 1)] = conv

        h = conv.contiguous().view(conv.size(0), -1)
        return h

    def forward(self, obs, detach=False):
        h = self.forward_conv(obs)

        h_fc = self.fc(h)
        self.outputs['fc'] = h_fc

        h_norm = self.ln(h_fc)
        self.outputs['ln'] = h_norm

        out = torch.tanh(h_norm)
        self.outputs['tanh'] = out

        return out

    def copy_conv_weights_from(self, source):
        """Tie convolutional layers"""
        # only tie conv layers
        for i in range(self.num_layers):
            tie_weights(src=source.convs[i], trg=self.convs[i])



def make_cnn(
    obs_shape, feature_dim, num_layers, num_filters
):
    return PixelCNN(
        obs_shape, feature_dim, num_layers, num_filters
    )