Removed some warnings

Author: FFMG

src/neuralnetwork/activation.cpp

@@ -540,7 +540,7 @@ activation::method activation::string_to_method(const std::string& str)
   MYODDWEB_PROFILE_FUNCTION("activation");
   std::string lower_str = str;
   std::transform(lower_str.begin(), lower_str.end(), lower_str.begin(),
-    [](unsigned char c) { return std::tolower(c); });
+    [](unsigned char c) { return static_cast<char>(std::tolower(static_cast<int>(c))); });
 
   if (lower_str == "linear")
   {

src/neuralnetwork/errorcalculation.h

@@ -80,7 +80,7 @@ class ErrorCalculation
     MYODDWEB_PROFILE_FUNCTION("ErrorCalculation");
     std::string lower_str = str;
     std::transform(lower_str.begin(), lower_str.end(), lower_str.begin(),
-      [](unsigned char c) { return std::tolower(c); });
+      [](unsigned char c) { return static_cast<char>(std::tolower(static_cast<int>(c))); });
 
     if (lower_str == "none")
     {

src/neuralnetwork/examples/compound_output_sandwich.h

@@ -74,6 +74,7 @@ class ExampleCompoundOutputSandwich
 
   static void verify_network(NeuralNetwork& nn, const std::vector<std::vector<double>>& inputs, const std::vector<std::vector<double>>& outputs, const std::string& label)
   {
+    (void)outputs;
     auto results = nn.think(inputs);
 
     bool s0_sum_ok = true;

src/neuralnetwork/examples/multi_output_gru.h

@@ -90,6 +90,7 @@ class ExampleMultiOutputGru
   static bool run_tests(NeuralNetwork& nn, size_t sequence_length)
   {
     MYODDWEB_PROFILE_FUNCTION("ExampleMultiOutputGru");
+    (void)sequence_length;
     Logger::info("Running validation tests...");
 
     struct TestCase {

src/neuralnetwork/examples/syntheticsentiment.h

@@ -59,7 +59,6 @@ class ExampleSyntheticSentiment
     for (size_t i = 0; i < num_samples; ++i)
     {
       std::vector<int> seq_indices;
-      double sentiment = 0.5; // undefined
 
       // Simple template choice
       // 0: "The movie is [not] [very] good/bad"

src/neuralnetwork/layer.h

@@ -288,7 +288,7 @@ class Layer
     std::string lower_str = str;
     // Convert the string to lowercase for case-insensitive comparison
     std::transform(lower_str.begin(), lower_str.end(), lower_str.begin(),
-      [](unsigned char c) { return std::tolower(c); });
+      [](unsigned char c) { return static_cast<char>(std::tolower(static_cast<int>(c))); });
 
     if (lower_str == "none")
     {