From d90e4109f2066f0396cbca31dda34579e3c608d0 Mon Sep 17 00:00:00 2001
From: Gustaf Rydholm <gustaf.rydholm@gmail.com>
Date: Sun, 19 Sep 2021 21:06:56 +0200
Subject: Add loading of encoder in vq transformer network

---
 text_recognizer/networks/vq_transformer.py | 54 ++++++++++++++++--------------
 1 file changed, 29 insertions(+), 25 deletions(-)

diff --git a/text_recognizer/networks/vq_transformer.py b/text_recognizer/networks/vq_transformer.py
index 69f68fd..5cdbab4 100644
--- a/text_recognizer/networks/vq_transformer.py
+++ b/text_recognizer/networks/vq_transformer.py
@@ -1,7 +1,9 @@
 """Vector quantized encoder, transformer decoder."""
 from pathlib import Path
-from typing import Tuple, Optional
+from typing import OrderedDict, Tuple, Union
 
+from hydra import compose, initialize
+from hydra.utils import instantiate
 import torch
 from torch import Tensor
 
@@ -21,11 +23,15 @@ class VqTransformer(ConvTransformer):
         dropout_rate: float,
         num_classes: int,
         pad_index: Tensor,
-        encoder: VQVAE,
         decoder: Decoder,
         no_grad: bool,
-        pretrained_encoder_path: Optional[str] = None,
+        pretrained_encoder_path: str,
     ) -> None:
+        # For typing
+        self.encoder: VQVAE = None
+        self.no_grad = no_grad
+
+        self._setup_encoder(pretrained_encoder_path)
         super().__init__(
             input_dims=input_dims,
             encoder_dim=encoder_dim,
@@ -33,32 +39,30 @@ class VqTransformer(ConvTransformer):
             dropout_rate=dropout_rate,
             num_classes=num_classes,
             pad_index=pad_index,
-            encoder=encoder,
+            encoder=self.encoder,
             decoder=decoder,
         )
-        # For typing
-        self.encoder: VQVAE
-
-        self.no_grad = no_grad
-
-        if pretrained_encoder_path is not None:
-            self.pretrained_encoder_path = (
-                Path(__file__).resolve().parents[2] / pretrained_encoder_path
-            )
-            self._setup_encoder()
-        else:
-            self.pretrained_encoder_path = None
-
-    def _load_pretrained_encoder(self) -> None:
-        self.encoder.load_state_dict(
-            torch.load(self.pretrained_encoder_path)["state_dict"]["network"]
-        )
 
-    def _setup_encoder(self) -> None:
-        """Remove unecessary layers."""
-        self._load_pretrained_encoder()
+    def _load_state_dict(self, path: Path) -> OrderedDict:
+        weights_path = list((path / "checkpoints").glob("epoch=*.ckpt"))[0]
+        renamed_state_dict = OrderedDict()
+        state_dict = torch.load(weights_path)["state_dict"]
+        for key in state_dict.keys():
+            if "network" in key:
+                new_key = key.removeprefix("network.")
+                renamed_state_dict[new_key] = state_dict[key]
+        del state_dict
+        return renamed_state_dict
+
+    def _setup_encoder(self, pretrained_encoder_path: str,) -> None:
+        """Load encoder module."""
+        with initialize(config_path=pretrained_encoder_path):
+            cfg = compose(config_name="config")
+        path = Path(__file__).resolve().parents[2] / pretrained_encoder_path
+        state_dict = self._load_state_dict(path)
+        self.encoder = instantiate(cfg.network)
+        self.encoder.load_state_dict(state_dict)
         del self.encoder.decoder
-        # del self.encoder.post_codebook_conv
 
     def _encode(self, x: Tensor) -> Tuple[Tensor, Tensor]:
         z_e = self.encoder.encode(x)
-- 
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