From 20225cbabbf327f34c0e4040ae8b48eecdbe424c Mon Sep 17 00:00:00 2001
From: Gustaf Rydholm <gustaf.rydholm@gmail.com>
Date: Mon, 11 Sep 2023 22:13:59 +0200
Subject: Move greedy decoder

---
 text_recognizer/model/greedy_decoder.py | 53 ---------------------------------
 1 file changed, 53 deletions(-)
 delete mode 100644 text_recognizer/model/greedy_decoder.py

(limited to 'text_recognizer/model')

diff --git a/text_recognizer/model/greedy_decoder.py b/text_recognizer/model/greedy_decoder.py
deleted file mode 100644
index 8d55a02..0000000
--- a/text_recognizer/model/greedy_decoder.py
+++ /dev/null
@@ -1,53 +0,0 @@
-"""Greedy decoder."""
-from typing import Type
-from text_recognizer.data.tokenizer import Tokenizer
-import torch
-from torch import nn, Tensor
-
-
-class GreedyDecoder:
-    def __init__(
-        self,
-        network: Type[nn.Module],
-        tokenizer: Tokenizer,
-        max_output_len: int = 682,
-    ) -> None:
-        self.network = network
-        self.start_index = tokenizer.start_index
-        self.end_index = tokenizer.end_index
-        self.pad_index = tokenizer.pad_index
-        self.max_output_len = max_output_len
-
-    def __call__(self, x: Tensor) -> Tensor:
-        bsz = x.shape[0]
-
-        # Encode image(s) to latent vectors.
-        img_features = self.network.encode(x)
-
-        # Create a placeholder matrix for storing outputs from the network
-        indecies = (
-            torch.ones((bsz, self.max_output_len), dtype=torch.long, device=x.device)
-            * self.pad_index
-        )
-        indecies[:, 0] = self.start_index
-
-        for i in range(1, self.max_output_len):
-            tokens = indecies[:, :i]  # (B, Sy)
-            logits = self.network.decode(tokens, img_features)  # [ B, N, C ]
-            indecies_ = logits.argmax(dim=2)  # [ B, N ]
-            indecies[:, i] = indecies_[:, -1]
-
-            # Early stopping of prediction loop if token is end or padding token.
-            if (
-                (indecies[:, i] == self.end_index) | (indecies[:, i] == self.pad_index)
-            ).all():
-                break
-
-        # Set all tokens after end token to pad token.
-        for i in range(1, self.max_output_len):
-            idx = (indecies[:, i - 1] == self.end_index) | (
-                indecies[:, i - 1] == self.pad_index
-            )
-            indecies[idx, i] = self.pad_index
-
-        return indecies
-- 
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