--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/tesseract/src/lstm/maxpool.h	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,59 @@
+///////////////////////////////////////////////////////////////////////
+// File:        maxpool.h
+// Description: Standard Max-Pooling layer.
+// Author:      Ray Smith
+//
+// (C) Copyright 2014, Google Inc.
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+///////////////////////////////////////////////////////////////////////
+
+#ifndef TESSERACT_LSTM_MAXPOOL_H_
+#define TESSERACT_LSTM_MAXPOOL_H_
+
+#include "reconfig.h"
+
+namespace tesseract {
+
+// Maxpooling reduction. Independently for each input, selects the location
+// in the rectangle that contains the max value.
+// Backprop propagates only to the position that was the max.
+class Maxpool : public Reconfig {
+public:
+  TESS_API
+  Maxpool(const std::string &name, int ni, int x_scale, int y_scale);
+  ~Maxpool() override = default;
+
+  // Accessors.
+  std::string spec() const override {
+    return "Mp" + std::to_string(y_scale_) + "," + std::to_string(x_scale_);
+  }
+
+  // Reads from the given file. Returns false in case of error.
+  bool DeSerialize(TFile *fp) override;
+
+  // Runs forward propagation of activations on the input line.
+  // See Network for a detailed discussion of the arguments.
+  void Forward(bool debug, const NetworkIO &input, const TransposedArray *input_transpose,
+               NetworkScratch *scratch, NetworkIO *output) override;
+
+  // Runs backward propagation of errors on the deltas line.
+  // See Network for a detailed discussion of the arguments.
+  bool Backward(bool debug, const NetworkIO &fwd_deltas, NetworkScratch *scratch,
+                NetworkIO *back_deltas) override;
+
+private:
+  // Memory of which input was the max.
+  GENERIC_2D_ARRAY<int> maxes_;
+};
+
+} // namespace tesseract.
+
+#endif // TESSERACT_LSTM_MAXPOOL_H_