Added a converter similar to the Open AI one

LLama.SemanticKernel/ChatCompletion/ChatRequestSettings.cs

@@ -1,4 +1,6 @@
 using Microsoft.SemanticKernel.AI;
+using System.Text.Json;
+using System.Text.Json.Serialization;
 
 namespace LLamaSharp.SemanticKernel.ChatCompletion;
 
@@ -8,12 +10,14 @@ public class ChatRequestSettings : AIRequestSettings
     /// Temperature controls the randomness of the completion.
     /// The higher the temperature, the more random the completion.
     /// </summary>
+    [JsonPropertyName("temperature")]
     public double Temperature { get; set; } = 0;
 
     /// <summary>
     /// TopP controls the diversity of the completion.
     /// The higher the TopP, the more diverse the completion.
     /// </summary>
+    [JsonPropertyName("top_p")]
     public double TopP { get; set; } = 0;
 
     /// <summary>
@@ -21,6 +25,7 @@ public class ChatRequestSettings : AIRequestSettings
     /// based on whether they appear in the text so far, increasing the
     /// model's likelihood to talk about new topics.
     /// </summary>
+    [JsonPropertyName("presence_penalty")]
     public double PresencePenalty { get; set; } = 0;
 
     /// <summary>
@@ -28,11 +33,13 @@ public class ChatRequestSettings : AIRequestSettings
     /// based on their existing frequency in the text so far, decreasing
     /// the model's likelihood to repeat the same line verbatim.
     /// </summary>
+    [JsonPropertyName("frequency_penalty")]
     public double FrequencyPenalty { get; set; } = 0;
 
     /// <summary>
     /// Sequences where the completion will stop generating further tokens.
     /// </summary>
+    [JsonPropertyName("stop_sequences")]
     public IList<string> StopSequences { get; set; } = Array.Empty<string>();
 
     /// <summary>
@@ -40,15 +47,67 @@ public class ChatRequestSettings : AIRequestSettings
     /// Note: Because this parameter generates many completions, it can quickly consume your token quota.
     /// Use carefully and ensure that you have reasonable settings for max_tokens and stop.
     /// </summary>
+    [JsonPropertyName("results_per_prompt")]
     public int ResultsPerPrompt { get; set; } = 1;
 
     /// <summary>
     /// The maximum number of tokens to generate in the completion.
     /// </summary>
+    [JsonPropertyName("max_tokens")]
     public int? MaxTokens { get; set; }
 
     /// <summary>
     /// Modify the likelihood of specified tokens appearing in the completion.
     /// </summary>
+    [JsonPropertyName("token_selection_biases")]
     public IDictionary<int, int> TokenSelectionBiases { get; set; } = new Dictionary<int, int>();
+
+    /// <summary>
+    /// Create a new settings object with the values from another settings object.
+    /// </summary>
+    /// <param name="requestSettings">Template configuration</param>
+    /// <param name="defaultMaxTokens">Default max tokens</param>
+    /// <returns>An instance of OpenAIRequestSettings</returns>
+    public static ChatRequestSettings FromRequestSettings(AIRequestSettings? requestSettings, int? defaultMaxTokens = null)
+    {
+        if (requestSettings is null)
+        {
+            return new ChatRequestSettings()
+            {
+                MaxTokens = defaultMaxTokens
+            };
+        }
+
+        if (requestSettings is ChatRequestSettings requestSettingsChatRequestSettings)
+        {
+            return requestSettingsChatRequestSettings;
+        }
+
+        var json = JsonSerializer.Serialize(requestSettings);
+        var chatRequestSettings = JsonSerializer.Deserialize<ChatRequestSettings>(json, s_options);
+
+        if (chatRequestSettings is not null)
+        {
+            return chatRequestSettings;
+        }
+
+        throw new ArgumentException($"Invalid request settings, cannot convert to {nameof(ChatRequestSettings)}", nameof(requestSettings));
+    }
+
+    private static readonly JsonSerializerOptions s_options = CreateOptions();
+
+    private static JsonSerializerOptions CreateOptions()
+    {
+        JsonSerializerOptions options = new()
+        {
+            WriteIndented = true,
+            MaxDepth = 20,
+            AllowTrailingCommas = true,
+            PropertyNameCaseInsensitive = true,
+            ReadCommentHandling = JsonCommentHandling.Skip,
+            Converters = { new ChatRequestSettingsConverter() }
+        };
+
+        return options;
+    }
 }

LLama.SemanticKernel/ChatCompletion/ChatRequestSettingsConverter.cs

@@ -0,0 +1,105 @@
+using System;
+using System.Collections.Generic;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace LLamaSharp.SemanticKernel.ChatCompletion;
+
+/// <summary>
+/// JSON converter for <see cref="OpenAIRequestSettings"/>
+/// </summary>
+public class ChatRequestSettingsConverter : JsonConverter<ChatRequestSettings>
+{
+    /// <inheritdoc/>
+    public override ChatRequestSettings? Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
+    {
+        var requestSettings = new ChatRequestSettings();
+
+        while (reader.Read() && reader.TokenType != JsonTokenType.EndObject)
+        {
+            if (reader.TokenType == JsonTokenType.PropertyName)
+            {
+                string? propertyName = reader.GetString();
+
+                if (propertyName is not null)
+                {
+                    // normalise property name to uppercase
+                    propertyName = propertyName.ToUpperInvariant();
+                }
+
+                reader.Read();
+
+                switch (propertyName)
+                {
+                    case "TEMPERATURE":
+                        requestSettings.Temperature = reader.GetDouble();
+                        break;
+                    case "TOPP":
+                    case "TOP_P":
+                        requestSettings.TopP = reader.GetDouble();
+                        break;
+                    case "FREQUENCYPENALTY":
+                    case "FREQUENCY_PENALTY":
+                        requestSettings.FrequencyPenalty = reader.GetDouble();
+                        break;
+                    case "PRESENCEPENALTY":
+                    case "PRESENCE_PENALTY":
+                        requestSettings.PresencePenalty = reader.GetDouble();
+                        break;
+                    case "MAXTOKENS":
+                    case "MAX_TOKENS":
+                        requestSettings.MaxTokens = reader.GetInt32();
+                        break;
+                    case "STOPSEQUENCES":
+                    case "STOP_SEQUENCES":
+                        requestSettings.StopSequences = JsonSerializer.Deserialize<IList<string>>(ref reader, options) ?? Array.Empty<string>();
+                        break;
+                    case "RESULTSPERPROMPT":
+                    case "RESULTS_PER_PROMPT":
+                        requestSettings.ResultsPerPrompt = reader.GetInt32();
+                        break;
+                    case "TOKENSELECTIONBIASES":
+                    case "TOKEN_SELECTION_BIASES":
+                        requestSettings.TokenSelectionBiases = JsonSerializer.Deserialize<IDictionary<int, int>>(ref reader, options) ?? new Dictionary<int, int>();
+                        break;
+                    case "SERVICEID":
+                    case "SERVICE_ID":
+                        requestSettings.ServiceId = reader.GetString();
+                        break;
+                    default:
+                        reader.Skip();
+                        break;
+                }
+            }
+        }
+
+        return requestSettings;
+    }
+
+    /// <inheritdoc/>
+    public override void Write(Utf8JsonWriter writer, ChatRequestSettings value, JsonSerializerOptions options)
+    {
+        writer.WriteStartObject();
+
+        writer.WriteNumber("temperature", value.Temperature);
+        writer.WriteNumber("top_p", value.TopP);
+        writer.WriteNumber("frequency_penalty", value.FrequencyPenalty);
+        writer.WriteNumber("presence_penalty", value.PresencePenalty);
+        if (value.MaxTokens is null)
+        {
+            writer.WriteNull("max_tokens");
+        }
+        else
+        {
+            writer.WriteNumber("max_tokens", (decimal)value.MaxTokens);
+        }
+        writer.WritePropertyName("stop_sequences");
+        JsonSerializer.Serialize(writer, value.StopSequences, options);
+        writer.WriteNumber("results_per_prompt", value.ResultsPerPrompt);
+        writer.WritePropertyName("token_selection_biases");
+        JsonSerializer.Serialize(writer, value.TokenSelectionBiases, options);
+        writer.WriteString("service_id", value.ServiceId);
+
+        writer.WriteEndObject();
+    }
+}

LLama.SemanticKernel/ChatCompletion/LLamaSharpChatCompletion.cs

@@ -61,7 +61,7 @@ public sealed class LLamaSharpChatCompletion : IChatCompletion
     public Task<IReadOnlyList<IChatResult>> GetChatCompletionsAsync(ChatHistory chat, AIRequestSettings? requestSettings = null, CancellationToken cancellationToken = default)
     {
         var settings = requestSettings != null 
-            ? (ChatRequestSettings)requestSettings
+            ? ChatRequestSettings.FromRequestSettings(requestSettings)
             : defaultRequestSettings;
 
         // This call is not awaited because LLamaSharpChatResult accepts an IAsyncEnumerable.
@@ -76,7 +76,7 @@ public sealed class LLamaSharpChatCompletion : IChatCompletion
 #pragma warning restore CS1998
     {
         var settings = requestSettings != null
-            ? (ChatRequestSettings)requestSettings
+            ? ChatRequestSettings.FromRequestSettings(requestSettings)
             : defaultRequestSettings;
 
         // This call is not awaited because LLamaSharpChatResult accepts an IAsyncEnumerable.

LLama.SemanticKernel/TextCompletion/LLamaSharpTextCompletion.cs

@@ -21,7 +21,7 @@ public sealed class LLamaSharpTextCompletion : ITextCompletion
 
     public async Task<IReadOnlyList<ITextResult>> GetCompletionsAsync(string text, AIRequestSettings? requestSettings, CancellationToken cancellationToken = default)
     {
-        var settings = (ChatRequestSettings?)requestSettings;
+        var settings = ChatRequestSettings.FromRequestSettings(requestSettings);
         var result = executor.InferAsync(text, settings?.ToLLamaSharpInferenceParams(), cancellationToken);
         return await Task.FromResult(new List<ITextResult> { new LLamaTextResult(result) }.AsReadOnly()).ConfigureAwait(false);
     }
@@ -30,7 +30,7 @@ public sealed class LLamaSharpTextCompletion : ITextCompletion
     public async IAsyncEnumerable<ITextStreamingResult> GetStreamingCompletionsAsync(string text, AIRequestSettings? requestSettings,[EnumeratorCancellation] CancellationToken cancellationToken = default)
 #pragma warning restore CS1998
     {
-        var settings = (ChatRequestSettings?)requestSettings;
+        var settings = ChatRequestSettings.FromRequestSettings(requestSettings);
         var result = executor.InferAsync(text, settings?.ToLLamaSharpInferenceParams(), cancellationToken);
         yield return new LLamaTextResult(result);
     }