Implemented fc layer and changed docker image to use pytorch

model/pytorch/dcrnn_cell.py

@@ -1 +1,136 @@
+from typing import Optional
+
 import torch
+from torch import Tensor
+
+from lib import utils
+
+
+class FCLayerParams:
+    def __init__(self, rnn_network: torch.nn.RNN):
+        self._rnn_network = rnn_network
+        self._params_dict = {}
+        self._biases_dict = {}
+
+    def get_weights(self, shape):
+        if shape not in self._params_dict:
+            nn_param = torch.nn.init.xavier_normal(torch.empty(*shape))
+            self._params_dict[shape] = nn_param
+            self._rnn_network.register_parameter('fc_weight_{}'.format(str(shape)), nn_param)
+        return self._params_dict[shape]
+
+    def get_biases(self, length, bias_start=0.0):
+        if length not in self._biases_dict:
+            biases = torch.nn.init.constant(torch.empty(length), bias_start)
+            self._biases_dict[length] = biases
+            self._rnn_network.register_parameter('fc_biases_{}'.format(str(length)), biases)
+
+        return self._biases_dict[length]
+
+
+class DCGRUCell(torch.nn.RNN):
+    def __init__(self, num_units, adj_mx, max_diffusion_step, num_nodes, input_size: int,
+                 hidden_size: int,
+                 num_layers: int = 1,
+                 num_proj=None,
+                 nonlinearity='tanh', filter_type="laplacian", use_gc_for_ru=True):
+        """
+
+        :param num_units:
+        :param adj_mx:
+        :param max_diffusion_step:
+        :param num_nodes:
+        :param input_size:
+        :param num_proj:
+        :param nonlinearity:
+        :param filter_type: "laplacian", "random_walk", "dual_random_walk".
+        :param use_gc_for_ru: whether to use Graph convolution to calculate the reset and update gates.
+        """
+        super(DCGRUCell, self).__init__(input_size, hidden_size, bias=True,
+                                        # bias param does not exist in tf code?
+                                        num_layers=num_layers,
+                                        nonlinearity=nonlinearity)
+        self._activation = torch.tanh if nonlinearity == 'tanh' else torch.relu
+        # support other nonlinearities up here?
+        self._num_nodes = num_nodes
+        self._num_proj = num_proj
+        self._num_units = num_units
+        self._max_diffusion_step = max_diffusion_step
+        self._supports = []
+        self._use_gc_for_ru = use_gc_for_ru
+        supports = []
+        if filter_type == "laplacian":
+            supports.append(utils.calculate_scaled_laplacian(adj_mx, lambda_max=None))
+        elif filter_type == "random_walk":
+            supports.append(utils.calculate_random_walk_matrix(adj_mx).T)
+        elif filter_type == "dual_random_walk":
+            supports.append(utils.calculate_random_walk_matrix(adj_mx).T)
+            supports.append(utils.calculate_random_walk_matrix(adj_mx.T).T)
+        else:
+            supports.append(utils.calculate_scaled_laplacian(adj_mx))
+        for support in supports:
+            self._supports.append(self._build_sparse_matrix(support))
+
+        self._proj_weights = torch.nn.Parameter(torch.randn(self._num_units, self._num_proj))
+        self._fc_params = FCLayerParams(self)
+
+    @property
+    def state_size(self):
+        return self._num_nodes * self._num_units
+
+    @property
+    def output_size(self):
+        output_size = self._num_nodes * self._num_units
+        if self._num_proj is not None:
+            output_size = self._num_nodes * self._num_proj
+        return output_size
+
+    def forward(self, input: Tensor, hx: Optional[Tensor] = ...):
+        """Gated recurrent unit (GRU) with Graph Convolution.
+        :param input: (B, num_nodes * input_dim)
+
+        :return
+        - Output: A `2-D` tensor with shape `[batch_size x self.output_size]`.
+        - New state: Either a single `2-D` tensor, or a tuple of tensors matching
+            the arity and shapes of `state`
+        """
+        output_size = 2 * self._num_units
+        # We start with bias of 1.0 to not reset and not update.
+        if self._use_gc_for_ru:
+            fn = self._gconv
+        else:
+            fn = self._fc
+        value = torch.sigmoid(fn(input, hx, output_size, bias_start=1.0))
+        value = torch.reshape(value, (-1, self._num_nodes, output_size))
+        r, u = torch.split(tensor=value, split_size_or_sections=2, dim=-1)
+        r = torch.reshape(r, (-1, self._num_nodes * self._num_units))
+        u = torch.reshape(u, (-1, self._num_nodes * self._num_units))
+
+        c = self._gconv(input, r * hx, self._num_units)
+        if self._activation is not None:
+            c = self._activation(c)
+
+        output = new_state = u * hx + (1 - u) * c
+        if self._num_proj is not None:
+            batch_size = input.shape[0]
+            output = torch.reshape(new_state, shape=(-1, self._num_units))
+            output = torch.reshape(torch.matmul(output, self._proj_weights),
+                                   shape=(batch_size, self.output_size))
+        return output, new_state
+
+    @staticmethod
+    def _concat(x, x_):
+        x_ = x_.unsqueeze(0)
+        return torch.cat([x, x_], dim=0)
+
+    def _fc(self, inputs, state, output_size, bias_start=0.0):
+        batch_size = inputs.shape[0]
+        inputs = torch.reshape(inputs, (batch_size * self._num_nodes, -1))
+        state = torch.reshape(state, (batch_size * self._num_nodes, -1))
+        inputs_and_state = torch.cat([inputs, state], dim=-1)
+        input_size = inputs_and_state.shape[-1]
+        weights = self._fc_params.get_weights((input_size, output_size))
+        value = torch.sigmoid(torch.matmul(inputs_and_state, weights))
+        biases = self._fc_params.get_biases(output_size, bias_start)
+        value += biases
+        return value

model/tf/dcrnn_cell.py

@@ -4,7 +4,6 @@ from __future__ import print_function
 
 import numpy as np
 import tensorflow as tf
-
 from tensorflow.contrib.rnn import RNNCell
 
 from lib import utils
@@ -85,6 +84,7 @@ class DCGRUCell(RNNCell):
         """
         with tf.variable_scope(scope or "dcgru_cell"):
             with tf.variable_scope("gates"):  # Reset gate and update gate.
+                print(inputs.get_shape(), self.output_size)
                 output_size = 2 * self._num_units
                 # We start with bias of 1.0 to not reset and not update.
                 if self._use_gc_for_ru:

requirements.txt

@@ -4,4 +4,5 @@ pandas>=0.19.2
 pyyaml
 statsmodels
 tensorflow>=1.3.0
-torch
+torch
+tables