> ## Documentation Index
> Fetch the complete documentation index at: https://koreai.mintlify.app/llms.txt
> Use this file to discover all available pages before exploring further.
# Engine Tuning
[Back to NLP Topics](/ai-for-service/automation/natural-language/nlp-topics)
Configure NLP engine thresholds and advanced settings per language under **Natural Language > NLU Config > Engine Tuning**.
For per-engine configuration details:
* [Fundamental Meaning Engine](/ai-for-service/automation/natural-language/training/fundamental-meaning#fundamental-meaning-engine)
* [Machine Learning Engine](/ai-for-service/automation/natural-language/training/machine-learning-engine#machine-learning-engine)
* [Knowledge Graph Training](/ai-for-service/automation/knowledge-ai/knowledge-graph-training#knowledge-graph-training)
* [Ranking and Resolver](/ai-for-service/automation/natural-language/training/ranking-and-resolver#ranking-and-resolver-engine)
***
## Advanced NLP Configurations
Default settings are appropriate for most use cases. Change only if you understand the impact — incorrect values can degrade performance.
Go to **Natural Language > NLU Config > Engine Tuning > Advanced NLP Configurations**.
### ML Engine Settings
| Configuration | Description | Valid Values | Notes |
| ----------------------------------------------- | ------------------------------------------------------------- | ---------------------------------------- | --------------------------------------------- |
| **Split Compound Words** | Splits compound words into stems before processing. | Enable / **Disable** (default) | German language only. |
| **None Intent** | Creates a placeholder intent to reduce ML false positives. | **Enable** (default) / Disable | |
| **Epochs** | Training iterations for neural network. | 20-300 (increments of 10; default: 20) | MLP-BOW, MLP-WordEmbeddings, LSTM, CNN only. |
| **Batch Size** | Training samples per batch. | 10-30 (increments of 5; default: 10) | MLP-BOW, MLP-WordEmbeddings, LSTM, CNN only. |
| **Learning Rate** | Controls weight adjustment vs. loss gradient. | 1e-4 to 1e-3 (default: 1e-3) | MLP-BOW, MLP-WordEmbeddings, LSTM, CNN only. |
| **Dropout** | Regularization to prevent overfitting. | 0-0.8 (increments of 0.1; default: 0) | MLP-BOW, MLP-WordEmbeddings, LSTM, CNN only. |
| **Vectorizer** | Feature extraction technique. | **count** (default) / tfidf | MLP-BOW only. |
| **Maximum Sequence Length** | Length of training samples / user input. | 10-30 (increments of 5; default: 20) | MLP-WordEmbeddings, LSTM, CNN only. |
| **Embeddings Type** | Feature extraction method. | generated / **random** (default) | MLP-WordEmbeddings, LSTM, CNN only. |
| **Embeddings Dimensions** | Dimensions used in featurization. | 100-400 (increments of 50; default: 300) | MLP-WordEmbeddings, LSTM, CNN only. |
| **K Fold** | K parameter for cross-validation. | 2-10 (default: 2) | |
| **Fuzzy Match** | Enables fuzzy matching for intent identification. | **Enable** (default) / Disable | |
| **Handle Negation** | Handles negated words in intent identification. | **Enable** (default) / Disable | |
| **Ignore Multiple Occurrences** | Disregards word frequency during vectorization. | **Enable** (default) / Disable | MLP-BOW only. |
| **Entity Placeholders in User Utterances** | Replaces entity values in utterances with placeholders. | **Enable** (default) / Disable | MLP-BOW only. |
| **Sentence Split** | Splits sentences before intent detection. | **Enable** (default) / Disable | |
| **Multiple Intent Models** | Separate ML model per primary intent (including sub-intents). | Enable / **Disable** (default) | |
| **Use only Tagged Utterances for NER Training** | NER model trains only on utterances with NER annotations. | **Enable** (default) / Disable | |
| **Neurons in Hidden Layer** | Number of hidden-layer neurons. | 0-1000 | Standard Network Type only. |
| **Softmax Temperature** | Controls how confidently ML identifies the winning intent. | 0-100 | Non-Standard Network Types only. |
| **Spell Correction in ML** | Enables spell correction on ML dictionary during prediction. | Enable / **Disable** (default) | English VAs only. |
| **Spell Correction Version** | Version of spell correction to apply. | Version 1 / Version 2 | English VAs only. Applied across all engines. |
| **Spell Correction Status** | Enable/disable spell correction globally. | Enable / Disable | English VAs only. |
### KG Engine Settings
| Configuration | Description | Valid Values |
| ---------------------------------------------- | -------------------------------------------------------------------- | ------------------------------------------------ |
| **Lemmatize KG Synonyms** | Uses lemmatized forms of KG synonyms for intent detection. | **Enable** (default) / Disable |
| **Cosine Similarity Dampening** | Prevents short questions from being penalized in cosine scoring. | **Enable** (default) / Disable |
| **FAQ Name as Intent Name** | Uses primary question as intent name when FAQ is linked to a dialog. | Enable / **Disable** (default) |
| **FAQs Order for Disambiguation** | Order of FAQs shown during ambiguity resolution. | Order by Hierarchy / **Default Order** (default) |
| **Auto qualify FAQs from Fully Matched Paths** | Qualifies all FAQs from a path when the path is fully matched. | Enable / Disable |
### Ranking and Resolver Settings
| Configuration | Description | Valid Values | Notes |
| ---------------------------- | ------------------------------------------------------------------ | ------------------------------ | -------------------------------------- |
| **Intent Elimination Rules** | Applies prebuilt rules to eliminate low-confidence intent matches. | **Enable** (default) / Disable | English, Spanish, French, German only. |