[AI] Remove CandidateCount form LiveGenerationConfig (#7382)

The parameter is not only unused, but can cause an error in the backend
if specified.

Internal b/439861714

Author: rlazo

firebase-ai/CHANGELOG.md

@@ -1,5 +1,7 @@
 # Unreleased
 
+- [changed] **Breaking Change**: Removed the `candidateCount` option from `LiveGenerationConfig`
+  (#7382)
 - [changed] Bumped internal dependencies.
 - [feature] Added support for code execution.
 - [changed] Marked the public constructors for `ExecutableCodePart` and `CodeExecutionResultPart` as
@@ -31,8 +33,6 @@
 
 # 17.1.0
 
-=======
-
 - [feature] added support for Imagen Editing, including inpainting, outpainting, control, style
   transfer, and subject references (#7075)
 

firebase-ai/api.txt

@@ -823,7 +823,6 @@ package com.google.firebase.ai.type {
   public static final class LiveGenerationConfig.Builder {
     ctor public LiveGenerationConfig.Builder();
     method public com.google.firebase.ai.type.LiveGenerationConfig build();
-    method public com.google.firebase.ai.type.LiveGenerationConfig.Builder setCandidateCount(Integer? candidateCount);
     method public com.google.firebase.ai.type.LiveGenerationConfig.Builder setFrequencyPenalty(Float? frequencyPenalty);
     method public com.google.firebase.ai.type.LiveGenerationConfig.Builder setMaxOutputTokens(Integer? maxOutputTokens);
     method public com.google.firebase.ai.type.LiveGenerationConfig.Builder setPresencePenalty(Float? presencePenalty);
@@ -832,7 +831,6 @@ package com.google.firebase.ai.type {
     method public com.google.firebase.ai.type.LiveGenerationConfig.Builder setTemperature(Float? temperature);
     method public com.google.firebase.ai.type.LiveGenerationConfig.Builder setTopK(Integer? topK);
     method public com.google.firebase.ai.type.LiveGenerationConfig.Builder setTopP(Float? topP);
-    field public Integer? candidateCount;
     field public Float? frequencyPenalty;
     field public Integer? maxOutputTokens;
     field public Float? presencePenalty;

firebase-ai/src/main/kotlin/com/google/firebase/ai/type/LiveGenerationConfig.kt

@@ -40,13 +40,6 @@ import kotlinx.serialization.Serializable
  * and the topP value is 0.5, then the model will select either A or B as the next token by using
  * the `temperature` and exclude C as a candidate. Defaults to 0.95 if unset.
  *
- * @property candidateCount The maximum number of generated response messages to return. This value
- * must be between [1, 8], inclusive. If unset, this will default to 1.
- *
- * - Note: Only unique candidates are returned. Higher temperatures are more likely to produce
- * unique candidates. Setting `temperature` to 0 will always produce exactly one candidate
- * regardless of the `candidateCount`.
- *
  * @property presencePenalty Positive penalties.
  *
  * @property frequencyPenalty Frequency penalties.
@@ -70,7 +63,6 @@ private constructor(
   internal val temperature: Float?,
   internal val topK: Int?,
   internal val topP: Float?,
-  internal val candidateCount: Int?,
   internal val maxOutputTokens: Int?,
   internal val presencePenalty: Float?,
   internal val frequencyPenalty: Float?,
@@ -94,8 +86,6 @@ private constructor(
    *
    * @property frequencyPenalty See [LiveGenerationConfig.frequencyPenalty]
    *
-   * @property candidateCount See [LiveGenerationConfig.candidateCount].
-   *
    * @property maxOutputTokens See [LiveGenerationConfig.maxOutputTokens].
    *
    * @property responseModality See [LiveGenerationConfig.responseModality]
@@ -106,7 +96,6 @@ private constructor(
     @JvmField public var temperature: Float? = null
     @JvmField public var topK: Int? = null
     @JvmField public var topP: Float? = null
-    @JvmField public var candidateCount: Int? = null
     @JvmField public var maxOutputTokens: Int? = null
     @JvmField public var presencePenalty: Float? = null
     @JvmField public var frequencyPenalty: Float? = null
@@ -118,9 +107,6 @@ private constructor(
     }
     public fun setTopK(topK: Int?): Builder = apply { this.topK = topK }
     public fun setTopP(topP: Float?): Builder = apply { this.topP = topP }
-    public fun setCandidateCount(candidateCount: Int?): Builder = apply {
-      this.candidateCount = candidateCount
-    }
     public fun setMaxOutputTokens(maxOutputTokens: Int?): Builder = apply {
       this.maxOutputTokens = maxOutputTokens
     }
@@ -143,7 +129,6 @@ private constructor(
         temperature = temperature,
         topK = topK,
         topP = topP,
-        candidateCount = candidateCount,
         maxOutputTokens = maxOutputTokens,
         presencePenalty = presencePenalty,
         frequencyPenalty = frequencyPenalty,
@@ -157,7 +142,6 @@ private constructor(
       temperature = temperature,
       topP = topP,
       topK = topK,
-      candidateCount = candidateCount,
       maxOutputTokens = maxOutputTokens,
       frequencyPenalty = frequencyPenalty,
       presencePenalty = presencePenalty,
@@ -172,7 +156,6 @@ private constructor(
     val temperature: Float?,
     @SerialName("top_p") val topP: Float?,
     @SerialName("top_k") val topK: Int?,
-    @SerialName("candidate_count") val candidateCount: Int?,
     @SerialName("max_output_tokens") val maxOutputTokens: Int?,
     @SerialName("presence_penalty") val presencePenalty: Float? = null,
     @SerialName("frequency_penalty") val frequencyPenalty: Float? = null,
@@ -201,7 +184,6 @@ private constructor(
  *   temperature = 0.75f
  *   topP = 0.5f
  *   topK = 30
- *   candidateCount = 4
  *   maxOutputTokens = 300
  *   ...
  * }

firebase-ai/src/testUtil/java/com/google/firebase/ai/JavaCompileTests.java

@@ -141,7 +141,6 @@ private LiveGenerationConfig getLiveConfig() {
         .setTopK(10)
         .setTopP(11.0F)
         .setTemperature(32.0F)
-        .setCandidateCount(1)
         .setMaxOutputTokens(0xCAFEBABE)
         .setFrequencyPenalty(1.0F)
         .setPresencePenalty(2.0F)