From 2f69126b9112386b08e77958316ccf849b6f6504 Mon Sep 17 00:00:00 2001
From: Hiroshiba Kazuyuki <kazuyuki_hiroshiba@dwango.co.jp>
Date: Fri, 1 Dec 2017 04:07:48 +0700
Subject: add gan

---
 become_yukarin/model.py | 44 +++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 43 insertions(+), 1 deletion(-)

(limited to 'become_yukarin/model.py')

diff --git a/become_yukarin/model.py b/become_yukarin/model.py
index c475685..8a727ae 100644
--- a/become_yukarin/model.py
+++ b/become_yukarin/model.py
@@ -1,5 +1,8 @@
+from typing import List
+
 import chainer
 
+from .config import DiscriminatorModelConfig
 from .config import ModelConfig
 
 
@@ -193,6 +196,35 @@ class Aligner(chainer.link.Chain):
         return h
 
 
+class Discriminator(chainer.link.Chain):
+    def __init__(self, in_channels: int, hidden_channels_list: List[int], last_channels: int):
+        super().__init__()
+        with self.init_scope():
+            self.convs = chainer.link.ChainList(*(
+                Convolution1D(i_c, o_c, ksize=2, stride=2, nobias=True)
+                for i_c, o_c in zip([in_channels] + hidden_channels_list[:-1], hidden_channels_list)
+            ))
+            self.lstm_cell = chainer.links.StatelessLSTM(hidden_channels_list[-1], last_channels)
+            self.last_linear = chainer.links.Linear(last_channels, 1)
+
+    def __call__(self, x):
+        """
+        :param x: (batch, channel, time)
+        """
+        h = x
+        for conv in self.convs.children():
+            h = chainer.functions.relu(conv(h))
+
+        hs = chainer.functions.separate(h, axis=2)
+        c_next = h_next = None
+        for h in reversed(hs):
+            c_next, h_next = self.lstm_cell(c_next, h_next, h)
+        h = h_next
+
+        h = self.last_linear(h)
+        return h
+
+
 def create_predictor(config: ModelConfig):
     network = CBHG(
         in_channels=config.in_channels,
@@ -220,10 +252,20 @@ def create_aligner(config: ModelConfig):
     return aligner
 
 
+def create_discriminator(config: DiscriminatorModelConfig):
+    discriminator = Discriminator(
+        in_channels=config.in_channels,
+        hidden_channels_list=config.hidden_channels_list,
+        last_channels=config.last_channels,
+    )
+    return discriminator
+
+
 def create(config: ModelConfig):
     predictor = create_predictor(config)
     if config.enable_aligner:
         aligner = create_aligner(config)
     else:
         aligner = None
-    return predictor, aligner
+    discriminator = create_discriminator(config.discriminator)
+    return predictor, aligner, discriminator
-- 
cgit v1.2.3-70-g09d2