From 6f6e7f7ad85ab92d9989404957624969a1c3e8f7 Mon Sep 17 00:00:00 2001
From: shahules786 <shahules786@gmail.com>
Date: Sat, 29 Oct 2022 13:20:04 +0530
Subject: [PATCH] init

---
 enhancer/models/complexnn/__init__.py |  1 +
 enhancer/models/complexnn/conv.py     | 77 +++++++++++++++++++++++++++
 tests/models/complexnn_test.py        | 13 +++++
 3 files changed, 91 insertions(+)
 create mode 100644 enhancer/models/complexnn/__init__.py
 create mode 100644 tests/models/complexnn_test.py

diff --git a/enhancer/models/complexnn/__init__.py b/enhancer/models/complexnn/__init__.py
new file mode 100644
index 0000000..68f376e
--- /dev/null
+++ b/enhancer/models/complexnn/__init__.py
@@ -0,0 +1 @@
+# from enhancer.models.complexnn.conv import ComplexConv2d
diff --git a/enhancer/models/complexnn/conv.py b/enhancer/models/complexnn/conv.py
index e69de29..eddcce3 100644
--- a/enhancer/models/complexnn/conv.py
+++ b/enhancer/models/complexnn/conv.py
@@ -0,0 +1,77 @@
+from typing import Tuple
+
+import torch
+import torch.nn.functional as F
+from torch import nn
+
+
+def init_weights(nnet):
+    nn.init.xavier_normal_(nnet.weight.data)
+    nn.init.constant(nnet.bias, 0.0)
+    return nnet
+
+
+class ComplexConv2d(nn.Module):
+    def __init__(
+        self,
+        in_channels: int,
+        out_channels: int,
+        kernel_size: Tuple[int, int] = (1, 1),
+        stride: Tuple[int, int] = (1, 1),
+        padding: Tuple[int, int] = (0, 0),
+        groups: int = 1,
+        dilation: int = 1,
+    ):
+        """
+        Complex Conv2d (non-causal)
+        """
+        super().__init__()
+        self.in_channels = in_channels // 2
+        self.out_channels = out_channels // 2
+        self.kernel_size = kernel_size
+        self.stride = stride
+        self.padding = padding
+        self.groups = groups
+        self.dilation = dilation
+
+        self.real_conv = nn.Conv2d(
+            self.in_channels,
+            self.out_channels,
+            kernel_size=self.kernel_size,
+            stride=self.stride,
+            padding=(self.padding[0], 0),
+            groups=self.groups,
+            dilation=self.dilation,
+        )
+        self.imag_conv = nn.Conv2d(
+            self.in_channels,
+            self.out_channels,
+            kernel_size=self.kernel_size,
+            stride=self.stride,
+            padding=(self.padding[0], 0),
+            groups=self.groups,
+            dilation=self.dilation,
+        )
+        self.imag_conv = init_weights(self.imag_conv)
+        self.real_conv = init_weights(self.real_conv)
+
+    def forward(self, input):
+        """
+        forward
+        complex axis should be always 1 dim
+        """
+        input = F.pad(input, [self.padding[1], self.padding[1], 0, 0])
+
+        real, imag = torch.chunk(input, 2, 1)
+        real_real = self.real_conv(real)
+        real_imag = self.imag_conv(real)
+
+        imag_imag = self.imag_conv(imag)
+        imag_real = self.real_conv(imag)
+
+        real = real_real - imag_imag
+        imag = real_imag - imag_real
+
+        out = torch.cat([real, imag], 1)
+
+        return out
diff --git a/tests/models/complexnn_test.py b/tests/models/complexnn_test.py
new file mode 100644
index 0000000..9ca5811
--- /dev/null
+++ b/tests/models/complexnn_test.py
@@ -0,0 +1,13 @@
+import torch
+
+from enhancer.models.complexnn.conv import ComplexConv2d
+
+
+def test_complexconv2d():
+    sample_input = torch.rand(1, 2, 256, 13)
+    conv = ComplexConv2d(
+        2, 32, kernel_size=(5, 2), stride=(2, 1), padding=(2, 1)
+    )
+    with torch.no_grad():
+        out = conv(sample_input)
+    assert out.shape == torch.Size([1, 32, 128, 14])