feed z into every layer of mod network

README.md

@@ -94,7 +94,7 @@ pred_img = wrapper() # (1, 3, 256, 256)
 
 A <a href="https://arxiv.org/abs/2104.03960">new paper</a> proposes that the best way to condition a Siren with a latent code is to pass the latent vector through a modulator feedforward network, where each layer's hidden state is elementwise multiplied with the corresponding layer of the Siren.
 
-You can use this simply by setting an extra keyword `latent_dim`, on the `SirenWrapper`
+You can use this simply by setting an extra keyword `use_latent`, on the `SirenWrapper`
 
 ```python
 import torch
@@ -111,12 +111,12 @@ net = SirenNet(
 
 wrapper = SirenWrapper(
     net,
-    latent_dim = 512,
+    use_latent = True,
     image_width = 256,
     image_height = 256
 )
 
-latent = torch.randn(512)
+latent = nn.Parameter(torch.zeros(256).normal_(0, 1e-2))
 img = torch.randn(1, 3, 256, 256)
 
 loss = wrapper(img, latent = latent)

setup.py

@@ -3,7 +3,7 @@
 setup(
   name = 'siren-pytorch',
   packages = find_packages(),
-  version = '0.1.1',
+  version = '0.1.2',
   license='MIT',
   description = 'Implicit Neural Representations with Periodic Activation Functions',
   author = 'Phil Wang',

siren_pytorch/siren_pytorch.py

@@ -83,40 +83,37 @@ def forward(self, x, mods = None):
             x = layer(x)
 
             if exists(mod):
-                x *= rearrange(mod, 'd -> () d')
+                x *= rearrange(mod, 'd -> () d').sigmoid()
 
         return self.last_layer(x)
 
 # modulatory feed forward
 
 class Modulator(nn.Module):
-    def __init__(self, dim_in, dim_hidden, num_layers):
+    def __init__(self, dim, num_layers):
         super().__init__()
-        dim = dim_in
         self.layers = nn.ModuleList([])
 
         for ind in range(num_layers):
-            is_first = ind == 0
-            dim = dim_in if is_first else dim_hidden
-
             self.layers.append(nn.Sequential(
-                nn.Linear(dim, dim_hidden),
+                nn.Linear(dim, dim),
                 nn.ReLU()
             ))
 
-    def forward(self, x):
+    def forward(self, z):
+        x = z
         hiddens = []
 
         for layer in self.layers:
-            x = layer(x)
+            x = layer(x + z)
             hiddens.append(x)
 
         return tuple(hiddens)
 
 # wrapper
 
 class SirenWrapper(nn.Module):
-    def __init__(self, net, image_width, image_height, latent_dim = None):
+    def __init__(self, net, image_width, image_height, use_latent = False):
         super().__init__()
         assert isinstance(net, SirenNet), 'SirenWrapper must receive a Siren network'
 
@@ -125,10 +122,9 @@ def __init__(self, net, image_width, image_height, latent_dim = None):
         self.image_height = image_height
 
         self.modulator = None
-        if exists(latent_dim):
+        if use_latent:
             self.modulator = Modulator(
-                dim_in = latent_dim,
-                dim_hidden = net.dim_hidden,
+                dim = net.dim_hidden,
                 num_layers = net.num_layers
             )