Data preparation

AUTHORS.rst

@@ -13,3 +13,5 @@ Contributors
 ------------
 
 * Amir Hosein Ebrahimi <[email protected]>
+
+* Saman Arzaghi <[email protected]>

Example/test/mnist.py

@@ -3,8 +3,8 @@
 from conex import *
 from conex.nn.priorities import NEURON_PRIORITIES
 
-from conex.helpers.encoders import Poisson
-from conex.helpers.transforms import *
+from conex.helpers.transforms.encoders import Poisson
+from conex.helpers.transforms.misc import *
 
 from torchvision import transforms
 from torchvision.datasets import MNIST
@@ -67,6 +67,7 @@
         depth=1, height=SENSORY_SIZE_HEIGHT, width=SENSORY_SIZE_WIDTH
     ),
     sensory_trace=SENSORY_TRACE_TAU_S,
+    instance_duration=POISSON_TIME,
 )
 
 #############################

conex/__init__.py

@@ -12,6 +12,6 @@
 
 from conex.behaviors.layer.dataset import *
 
-from conex.nn.Structure import *
-from conex.nn.Modules import *
+from conex.nn.structure import *
+from conex.nn.modules import *
 from conex.nn.config import *

conex/behaviors/layer/dataset.py

@@ -1,3 +1,5 @@
+import torch
+
 """
 Behaviors to load datasets 
 """
@@ -17,6 +19,8 @@ class SpikeNdDataset(Behavior):
         have_location (bool): Whether dataloader returns location input.
         have_sensory (bool): Whether dataloader returns sensory input.
         have_label (bool): Whether dataloader returns label of input.
+        silent_interval (int): The interval of silent activity between two different input.
+        instance_duration (int): The duration of each instance of input with same target value.
         loop (bool): If True, dataloader repeats.
     """
 
@@ -27,10 +31,14 @@ def initialize(self, layer):
         self.have_location = self.parameter("have_location", False)
         self.have_sensory = self.parameter("have_sensory", True)
         self.have_label = self.parameter("have_label", True)
+        self.silent_interval = self.parameter("silent_interval", 0)
+        self.each_instance = self.parameter("instance_duration", 0, required=True)
         self.loop = self.parameter("loop", True)
 
         self.data_generator = self._get_data()
         self.device = layer.device
+        self.new_data = False
+        self.silent_iteration = 0
 
     def _get_data(self):
         while self.loop:
@@ -59,13 +67,39 @@ def _get_data(self):
 
                 if batch_y is not None:
                     batch_y = batch_y.to(self.device)
-                    each_instance = num_instance // torch.numel(batch_y)
+                    self.each_instance = num_instance // torch.numel(batch_y)
 
                 for i in range(num_instance):
                     x = batch_x[i].view((-1,)) if batch_x is not None else None
                     loc = batch_loc[i].view((-1,)) if batch_loc is not None else None
-                    y = batch_y[i // each_instance] if batch_y is not None else None
+                    y = (
+                        batch_y[i // self.each_instance]
+                        if batch_y is not None
+                        else None
+                    )
+                    if i % self.each_instance == self.each_instance - 1:
+                        self.new_data = True
                     yield x, loc, y
 
     def forward(self, layer):
+        if self.silent_interval and self.new_data:
+            if self.silent_iteration == 0:
+                layer.x = (
+                    layer.tensor(mode="zeros", dtype=torch.bool, dim=layer.x.shape)
+                    if layer.x is not None
+                    else None
+                )
+                layer.loc = (
+                    layer.tensor(mode="zeros", dtype=torch.bool, dim=layer.loc.shape)
+                    if layer.loc is not None
+                    else None
+                )
+
+            self.silent_iteration += 1
+
+            if self.silent_iteration == self.silent_interval:
+                self.new_data = False
+                self.silent_iteration = 0
+            return
+
         layer.x, layer.loc, layer.y = next(self.data_generator)

conex/behaviors/synapses/specs.py

@@ -98,6 +98,8 @@ class WeightInitializer(Behavior):
 
     def initialize(self, synapse):
         init_mode = self.parameter("mode", None)
+        scale = self.parameter("scale", 1)
+        offset = self.parameter("offset", 0)
         synapse.weights = self.parameter("weights", None)
         synapse.weight_shape = self.parameter("weight_shape", None)
         synapse.kernel_shape = self.parameter("kernel_shape", None)
@@ -110,6 +112,8 @@ def initialize(self, synapse):
                     mode=init_mode, dim=synapse.weight_shape
                 )
 
+            synapse.weights = synapse.weights * scale + offset
+
 
 class WeightNormalization(Behavior):
     """

conex/helpers/data.py

@@ -0,0 +1,44 @@
+from torch.utils.data import Dataset
+
+
+class LocationDataset(Dataset):
+    """
+    A custom dataset class for data with triple image, location, label nature.
+
+    Args:
+        dataset (Dataset): An Instance of a dataset
+        pre_transform (Transform): A transformation to apply on images. If given, transformation should return a `(image, location)` tuple.
+        post_transform  (Transform): A Transformation that applies on images. Suitable for encodings.
+        location_transform (Transform): A Transformation applies on location data. Suitable for encodings.
+        target_transform (Transform): A Transformation applies on labels.
+    """
+
+    def __init__(
+        self,
+        dataset,
+        pre_transform=None,
+        post_transform=None,
+        location_transform=None,
+        target_transform=None,
+    ):
+        self.dataset = dataset
+        self.pre_transform = pre_transform
+        self.post_transform = post_transform
+        self.location_transform = location_transform
+        self.target_transform = target_transform
+
+    def __len__(self):
+        return len(self.dataset)
+
+    def __getitem__(self, idx):
+        image, label = self.dataset[idx]
+        location = None
+        if self.pre_transform:
+            image, location = self.pre_transform(image)
+        if self.post_transform:
+            image = self.post_transform(image)
+        if self.location_transform:
+            location = self.location_transform(location)
+        if self.target_transform:
+            label = self.target_transform(label)
+        return image, location, label

conex/helpers/filters.py

@@ -0,0 +1,110 @@
+import torch
+
+
+def DoGFilter(
+    size,
+    sigma_1,
+    sigma_2,
+    step=1.0,
+    zero_mean=False,
+    one_sum=False,
+    device=None,
+    dtype=None,
+):
+    """Difference of Gaussians.
+    Makes a square mono-colored DoG filter.
+
+    Args:
+        size (int): Filter size.
+        sigma_1 (float): First standard deviation.
+        sigma_2 (float): Second standard deviation.
+        step (float, optional): Scaling factor for axes. Defaults to 1.0.
+        zero_mean (bool, optional): Whether to scale negative values in order to have zero mean. Defaults to False.
+        one_sum (bool, optional): Whether to divide values in order to have maximum possible dot product equal to one. Defaults to False.
+        device (str, optional): Device to locate filter on. Defaults to None.
+        dtype (dtype, optional): Datatype of desired filter. Defaults to None.
+
+    Returns:
+        tensor: the desired DoG filter
+    """
+    scale = (size - 1) / 2
+
+    v_range = torch.arange(-scale, scale + step, step, dtype=dtype, device=device)
+    x, y = torch.meshgrid(v_range, v_range, indexing="ij")
+
+    g_values = -(x**2 + y**2) / 2
+
+    dog_1 = torch.exp(g_values / (sigma_1**2)) / sigma_1
+    dog_2 = torch.exp(g_values / (sigma_2**2)) / sigma_2
+
+    dog_filter = (dog_1 - dog_2) / torch.sqrt(
+        torch.tensor(2 * torch.pi, device=device, dtype=dtype)
+    )
+
+    if zero_mean:
+        p_sum = torch.sum(dog_filter[dog_filter > 0])
+        n_sum = torch.sum(dog_filter[dog_filter < 0])
+        dog_filter[dog_filter < 0] *= -p_sum / n_sum
+
+    if one_sum:
+        dog_filter /= torch.sum(torch.abs(dog_filter))
+
+    return dog_filter
+
+
+def GaborFilter(
+    size,
+    labda,
+    theta,
+    sigma,
+    gamma,
+    step=1.0,
+    zero_mean=False,
+    one_sum=False,
+    device=None,
+    dtype=None,
+):
+    """Gabor filter
+    Makes a square mono-colored Gabor filter.
+
+    Args:
+        size (int): Filter size.
+        labda (float): The wavelength of the filter.
+        theta (float): The orientation of the filter.
+        sigma (float): The standard deviation of the filter.
+        gamma (float): The aspect ratio for the filter.
+        step (float, optional): Scaling factor for axes. Defaults to 1.0.
+        zero_mean (bool, optional): Whether to scale negative values in order to have zero mean. Defaults to False.
+        one_sum (bool, optional): Whether to divide values in order to have maximum possible dot product equal to one. Defaults to False.
+        device (str, optional): Device to locate filter on. Defaults to None.
+        dtype (dtype, optional): Datatype of desired filter. Defaults to None.
+
+    Returns:
+        tensor: the desired Gabor filter
+    """
+
+    scale = (size - 1) / 2
+
+    v_range = torch.arange(-scale, scale + step, step, dtype=dtype, device=device)
+    x, y = torch.meshgrid(v_range, v_range, indexing="ij")
+
+    x_rotated = x * torch.cos(
+        torch.tensor(theta, device=device, dtype=dtype)
+    ) + y * torch.sin(torch.tensor(theta, device=device, dtype=dtype))
+    y_rotated = -x * torch.sin(
+        torch.tensor(theta, device=device, dtype=dtype)
+    ) + y * torch.cos(torch.tensor(theta, device=device, dtype=dtype))
+
+    gabor_filter = torch.exp(
+        -(x_rotated**2 + (gamma**2 * y_rotated**2)) / (2 * sigma**2)
+    ) * torch.cos(2 * torch.pi * x_rotated / labda)
+
+    if zero_mean:
+        p_sum = torch.sum(gabor_filter[gabor_filter > 0])
+        n_sum = torch.sum(gabor_filter[gabor_filter < 0])
+        gabor_filter[gabor_filter < 0] *= -p_sum / n_sum
+
+    if one_sum:
+        gabor_filter /= torch.sum(torch.abs(gabor_filter))
+
+    return gabor_filter