Code Index: plexe

Code Index: plexe

Generated on 2026-02-26 19:02:04

Code structure and public interface documentation for the plexe package.

agents/baseline_builder.py

Baseline Builder Agent.

BaselineBuilderAgent - Agent that creates simple baseline predictors.

• __init__(self, spark: SparkSession, context: BuildContext, config: Config)
• run(self) -> Baseline - Build baseline predictor using agent.

agents/dataset_splitter.py

Dataset Splitter Agent.

DatasetSplitterAgent - Agent that generates PySpark code for intelligent dataset splitting.

• __init__(self, spark: SparkSession, dataset_uri: str, context: BuildContext, config: Config)
• run(self, split_ratios: dict[str, float], output_dir: str | Path) -> tuple[str, str, str] - Generate and execute intelligent dataset splitting.

agents/feature_processor.py

Feature Processor Agent.

FeatureProcessorAgent - Agent that designs sklearn Pipeline for feature engineering.

• __init__(self, spark: SparkSession, train_uri: str, context: BuildContext, config: Config, plan: Any)
• run(self) -> tuple[Pipeline, str] - Design feature engineering pipeline.

agents/hypothesiser.py

Hypothesiser Agent.

HypothesiserAgent - Agent that generates hypotheses for next search direction.

• __init__(self, journal: SearchJournal, context: BuildContext, config: Config, expand_solution_id: int)
• run(self) -> Hypothesis - Generate hypothesis for next exploration.

agents/insight_extractor.py

Insight Extractor Agent.

InsightExtractorAgent - Agent that extracts structured insights from experiment results.

• __init__(self, hypothesis: Hypothesis, variant_solutions: list[Solution], insight_store, context: BuildContext, config: Config)
• run(self) -> int - Extract insights from variant results.

agents/layout_detector.py

Layout Detection Agent.

LayoutDetectionAgent - Agent that detects data layout and identifies primary input column.

• __init__(self, spark: SparkSession, dataset_uri: str, context: BuildContext, config: Config)
• run(self) -> dict - Run layout detection.

agents/metric_implementer.py

Metric Implementation Agent.

MetricImplementationAgent - Agent that generates metric computation function code.

• __init__(self, context: BuildContext, config: Config)
• run(self) -> Any - Generate metric computation function.

agents/metric_selector.py

Metric Selector Agent.

MetricSelectorAgent - Agent that selects evaluation metric using smolagents with structured submission tool.

• __init__(self, context: BuildContext, config: Config)
• run(self) -> Metric - Run metric selection with structured submission.

agents/ml_task_analyser.py

ML Task Analyser Agent.

MLTaskAnalyserAgent - Agent that analyzes dataset from ML perspective.

• __init__(self, spark: SparkSession, dataset_uri: str, stats_report: dict, context: BuildContext, config: Config)
• run(self) -> dict - Run ML task analysis.

agents/model_definer.py

Model Definer Agent.

ModelDefinerAgent - Agent that defines model configuration.

• __init__(self, model_type: str, context: BuildContext, config: Config, transformed_schema: dict, plan: Any)
• run(self) -> tuple[Any, str] - Create untrained model object from plan.

agents/model_evaluator.py

Model Evaluator Agent for comprehensive ML model evaluation.

ModelEvaluatorAgent - Agent that performs comprehensive model evaluation through structured phases.

• __init__(self, spark: SparkSession, context: BuildContext, config: Config)
• run(self, solution: Solution, test_sample_df: pd.DataFrame, predictor: Any) -> EvaluationReport | None - Execute multi-phase evaluation.

agents/planner.py

Planner Agent.

PlannerAgent - Agent that creates concrete plan specifications from hypotheses.

• __init__(self, journal: SearchJournal, context: BuildContext, config: Config, hypothesis: Hypothesis | None, num_bootstrap: int)
• run(self) -> list[UnifiedPlan] - Generate concrete plan specifications.

agents/sampler.py

Sampling Agent.

SamplingAgent - Agent that generates PySpark code for intelligent dataset sampling.

• __init__(self, spark: SparkSession, context: BuildContext, config: Config)
• run(self, train_uri: str, val_uri: str, train_sample_size: int, val_sample_size: int, output_dir: Path) -> tuple[str, str] - Generate and execute intelligent sampling for both train and val datasets.

agents/statistical_analyser.py

Statistical Analyser Agent.

StatisticalAnalyserAgent - Agent that performs statistical profiling of datasets.

• __init__(self, spark: SparkSession, dataset_uri: str, context: BuildContext, config: Config)
• run(self) -> dict - Run statistical analysis.

agents/utils.py

Shared utilities for agents.

Functions:

• format_user_feedback_for_prompt(user_feedback: dict | str | None) -> str - Format user feedback for inclusion in agent prompts.

checkpointing.py

Checkpointing functionality for plexe.

Functions:

• pickle_to_base64(obj) -> str - Serialize object to base64-encoded pickle string.
• base64_to_pickle(b64_string: str) - Deserialize base64-encoded pickle string to object.
• save_checkpoint(experiment_id: str, phase_name: str, context: BuildContext, work_dir: Path, search_journal: SearchJournal | None, insight_store: InsightStore | None) -> Path | None - Save checkpoint to local disk only.
• load_checkpoint(phase_name: str, work_dir: Path) -> dict | None - Load checkpoint from local disk.

config.py

Configuration for plexe.

ModelType - Supported model types (architectural decision).

StandardMetric - Standard metrics with hardcoded implementations.

YamlConfigSettingsSource - Custom settings source that loads config from YAML file specified by CONFIG_FILE env var.

• get_field_value(self, field, field_name) - Not used in Pydantic v2 - use call instead.

RoutingProviderConfig - Configuration for a single routing provider.

RoutingConfig - LiteLLM routing configuration for custom API endpoints.

• validate_model_providers(cls, v: dict[str, str], info) -> dict[str, str] - Validate that all model provider references exist.

Config - Configuration for model building workflow.

• settings_customise_sources(cls, settings_cls, init_settings, env_settings, dotenv_settings, file_secret_settings) - Customize settings source priority.
• validate_nn_training_settings(self) -> 'Config' - Ensure neural network defaults do not exceed the configured cap.
• parse_otel_headers_from_env(self) -> 'Config' - Parse OTEL_EXPORTER_OTLP_HEADERS (comma-separated key=value pairs).

Functions:

• get_routing_for_model(config: RoutingConfig | None, model_id: str) -> tuple[str | None, dict[str, str]] - Get routing configuration for a specific model ID.
• setup_logging(config: Config) -> logging.Logger - Configure logging for the plexe package.
• setup_litellm(config: Config) -> None - Configure LiteLLM global settings.
• get_config() -> Config - Get configuration from YAML file (if specified) with environment variable overrides.

constants.py

Constants for plexe.

ScratchKeys - Keys for BuildContext.scratch dictionary.

DatasetPatterns - Naming patterns for dataset artifacts.

• transformed_name(base_uri: str, iteration: int) -> str - Generate name for transformed dataset.

SearchDefaults - Default values for search configuration.

DirNames - Standard directory and file names used across the codebase.

PhaseNames - Standardized phase names for workflow orchestration.

execution/dataproc/dataset_io.py

Dataset I/O with format detection and normalization.

DatasetFormat - Supported dataset formats.

FormatDetector - Detects dataset format from URI.

• detect(uri: str) -> DatasetFormat - Detect format from URI.

DatasetReader - Reads datasets in any supported format using Spark.

• __init__(self, spark: SparkSession)
• read(self, uri: str, format: DatasetFormat, options: dict | None) -> DataFrame - Read dataset in specified format.

DatasetNormalizer - Normalizes datasets to Parquet format.

• __init__(self, spark: SparkSession)
• normalize(self, input_uri: str, output_uri: str, format_hint: DatasetFormat | None, read_options: dict | None) -> tuple[str, DatasetFormat] - Normalize dataset to Parquet format.

execution/dataproc/session.py

Spark session management with singleton pattern.

Functions:

• get_or_create_spark_session(config) -> SparkSession - Get or create Spark session based on config.
• stop_spark_session() - Stop and cleanup Spark session.

execution/training/local_runner.py

Local process runner - executes training in subprocess.

LocalProcessRunner - Runs training in local subprocess.

• __init__(self, work_dir: str)
• run_training(self, template: str, model: Any, feature_pipeline: Pipeline, train_uri: str, val_uri: str, timeout: int, target_columns: list[str], optimizer: Any, loss: Any, epochs: int, batch_size: int, group_column: str | None) -> Path - Execute training in subprocess.

execution/training/runner.py

Training runner abstract base class.

TrainingRunner - Abstract base class for training execution environments.

• run_training(self, template: str, model: Any, feature_pipeline: Pipeline, train_uri: str, val_uri: str, timeout: int, target_columns: list[str]) -> Path - Execute model training and return path to artifacts.

helpers.py

Helper functions for workflow.

Functions:

• select_viable_model_types(data_layout: DataLayout, selected_frameworks: list[str] | None) -> list[str] - Select viable model types using three-tier filtering.
• evaluate_on_sample(spark: SparkSession, sample_uri: str, model_artifacts_path: Path, model_type: str, metric: str, target_columns: list[str], group_column: str | None) -> float - Evaluate model on sample (fast).
• compute_metric_hardcoded(y_true, y_pred, metric_name: str) -> float - Compute metric using hardcoded sklearn implementations.
• compute_metric(y_true, y_pred, metric_name: str, group_ids) -> float - Compute metric value.

integrations/base.py

Base integration interface for connecting plexe to external infrastructure.

WorkflowIntegration - Integration interface for environment-specific infrastructure.

• prepare_workspace(self, experiment_id: str, work_dir: Path) -> None - Prepare workspace for a model-building run.
• get_artifact_location(self, artifact_type: str, dataset_uri: str, experiment_id: str, work_dir: Path) -> str - Determine where an intermediate artifact should be written.
• ensure_local(self, uris: list[str], work_dir: Path) -> list[str] - Ensure remote URIs are available on the local filesystem.
• prepare_original_model(self, model_reference: str, work_dir: Path) -> str - Locate and download an existing model for retraining.
• on_checkpoint(self, experiment_id: str, phase_name: str, checkpoint_path: Path, work_dir: Path) -> None - Persist checkpoint and work directory after a phase completes.
• on_completion(self, experiment_id: str, work_dir: Path, final_metrics: dict, evaluation_report: Any) -> None - Persist final model and update tracking on successful completion.
• on_failure(self, experiment_id: str, error: Exception) -> None - Handle workflow failure.
• on_pause(self, phase_name: str) -> None - Handle workflow pause for user feedback.

integrations/standalone.py

Standalone integration for local development and S3-backed deployments.

StandaloneIntegration - Standalone integration for local development and testing.

• __init__(self, external_storage_uri: str | None, user_id: str | None)
• prepare_workspace(self, experiment_id: str, work_dir: Path) -> None - Restore workspace from S3 if a previous run exists.
• get_artifact_location(self, artifact_type: str, dataset_uri: str, experiment_id: str, work_dir: Path) -> str - Determine storage location based on dataset location.
• ensure_local(self, uris: list[str], work_dir: Path) -> list[str] - Download S3 URIs to local if needed (handles Spark parquet directories).
• prepare_original_model(self, model_reference: str, work_dir: Path) -> str - Prepare original model for retraining.
• on_checkpoint(self, experiment_id: str, phase_name: str, checkpoint_path: Path, work_dir: Path) -> None - Upload checkpoint and workdir to S3 if configured.
• on_completion(self, experiment_id: str, work_dir: Path, final_metrics: dict, evaluation_report: Any) -> None - Upload final model to S3 if configured.

integrations/storage/__init__.py

Storage helper interface and implementations.

StorageHelper - Abstract base for cloud/remote storage helpers.

• upload_file(self, local_path: Path, key: str) -> str - Upload a local file to remote storage.
• download_file(self, key: str, local_path: Path) -> None - Download a remote file to local filesystem.
• object_exists(self, key: str) -> bool - Check whether an object exists in remote storage.
• download_directory(self, uri: str, local_dir: Path) -> str - Download a remote directory (e.g., Spark parquet output) to local filesystem.

integrations/storage/azure.py

Azure Blob Storage helper (stub).

AzureBlobHelper - Azure Blob Storage helper (not yet implemented).

• upload_file(self, local_path: Path, key: str) -> str - No description
• download_file(self, key: str, local_path: Path) -> None - No description
• object_exists(self, key: str) -> bool - No description
• download_directory(self, uri: str, local_dir: Path) -> str - No description

integrations/storage/gcs.py

Google Cloud Storage helper (stub).

GCSHelper - Google Cloud Storage helper (not yet implemented).

• upload_file(self, local_path: Path, key: str) -> str - No description
• download_file(self, key: str, local_path: Path) -> None - No description
• object_exists(self, key: str) -> bool - No description
• download_directory(self, uri: str, local_dir: Path) -> str - No description

integrations/storage/s3.py

Amazon S3 storage helper.

S3Helper - Amazon S3 storage helper.

• __init__(self, bucket: str, prefix: str, user_id: str | None)
• parse_uri(uri: str) -> tuple[str, str] - Parse s3://bucket/prefix into (bucket, prefix).
• build_key(self, experiment_id: str) -> str - Build S3 key with user/experiment scoping.
• upload_file(self, local_path: Path, key: str) -> str - Upload file to S3.
• download_file(self, key: str, local_path: Path) -> None - Download file from S3.
• object_exists(self, key: str) -> bool - Check if S3 object exists.
• download_directory(self, uri: str, local_dir: Path) -> str - Download a Spark parquet directory (multiple part files) from S3.
• tar_and_upload(self, local_dir: Path, s3_key: str) -> str - Create tarball from directory and upload to S3.
• download_and_extract_tar(self, s3_key: str, extract_to: Path) -> None - Download tarball from S3 and extract.
• handle_download_error(self, error: ClientError, reference: str, context: str) -> None - Raise appropriate exception for S3 download errors.

main.py

Universal entry point for plexe.

Functions:

• main(intent: str, data_refs: list[str], integration: WorkflowIntegration | None, spark_mode: str, user_id: str, experiment_id: str, max_iterations: int, work_dir: Path, test_dataset_uri: str | None, enable_final_evaluation: bool, max_epochs: int | None, allowed_model_types: list[str] | None, is_retrain: bool, original_model_uri: str | None, original_experiment_id: str | None, auto_mode: bool, user_feedback: dict | None, enable_otel: bool, otel_endpoint: str | None, otel_headers: dict[str, str] | None, external_storage_uri: str | None, csv_delimiter: str, csv_header: bool) - Main model building function.

models.py

Simple dataclasses for model building workflow.

DataLayout - Physical structure of dataset (not semantic meaning).

Metric - Evaluation metric definition.

BuildContext - Context passed through workflow phases.

• add_outer_loop_feedback(self, solution: Optional['Solution'], issue: str) - Add feedback for outer loop retry.
• update(self) - Convenience method to update multiple fields.
• to_dict(self) -> dict - Serialize BuildContext to dict for checkpointing.
• from_dict(d: dict) -> 'BuildContext' - Deserialize BuildContext from checkpoint dict.

Baseline - Represents a baseline model result.

Solution - Represents a solution in the search tree.

• is_leaf(self) -> bool - Check if this is a leaf node in the search tree.
• debug_depth(self) -> int - Number of consecutive buggy ancestors in lineage.
• is_successful(self) -> bool - Check if execution succeeded.
• to_dict(self) -> dict - Serialize solution to dict for checkpointing.
• from_dict(d: dict, all_solutions: dict[int, 'Solution']) -> 'Solution' - Deserialize solution from checkpoint dict.

Insight - Structured learning extracted from search experiments.

Hypothesis - Strategic direction for next exploration.

FeaturePlan - Feature engineering specification.

ModelPlan - Model configuration specification (natural language directive).

UnifiedPlan - Complete solution specification (features + model).

CoreMetricsReport - Core performance metrics on test set.

DiagnosticReport - Error analysis and failure pattern detection.

RobustnessReport - Model reliability under stress conditions.

ExplainabilityReport - Feature importance and model interpretability.

BaselineComparisonReport - Model vs. baseline performance comparison.

EvaluationReport - Final comprehensive evaluation with verdict and recommendations.

TrainingError - Raised when training fails.

ValidationError - Raised when validation fails.

retrain.py

Model retraining functionality.

RetrainingError - Raised when retraining fails.

Functions:

• retrain_model(original_model_uri: str, train_dataset_uri: str, experiment_id: str, work_dir: Path, runner, config, on_checkpoint_saved) -> tuple[Solution, dict] - Retrain existing model with new data using original training pipeline.

search/evolutionary_search_policy.py

PiEvolve-inspired evolutionary search policy with adaptive state analysis.

EvolutionarySearchPolicy - PiEvolve-inspired probabilistic action selection with adaptive search state analysis.

• __init__(self, num_drafts: int, debug_prob: float, max_debug_depth: int)
• decide_next_solution(self, journal: SearchJournal, context: BuildContext, iteration: int, max_iterations: int) -> Solution | None - PiEvolve-style probabilistic action selection based on search state.
• should_stop(self, journal: SearchJournal, iteration: int, max_iterations: int) -> bool - Enhanced stopping criteria with intelligent early stopping.

search/insight_store.py

Insight store for accumulating learnings from search.

InsightStore - Simple store for insights extracted from experiments.

• __init__(self)
• add(self, change: str, effect: str, context: str, confidence: str, supporting_evidence: list[int]) -> Insight - Add new insight.
• update(self, insight_id: int) -> bool - Update insight fields.
• get_all(self) -> list[Insight] - Get all insights.
• to_dict(self) -> dict - Serialize InsightStore to dict for checkpointing.
• from_dict(d: dict) -> 'InsightStore' - Deserialize InsightStore from checkpoint dict.

search/journal.py

Search journal for tracking model search tree.

SearchJournal - Tracks solution search tree.

• __init__(self, baseline: Baseline | None)
• add_node(self, node: Solution) -> None - Add a solution to the journal.
• draft_nodes(self) -> list[Solution] - Get all root nodes (bootstrap solutions without parents).
• buggy_nodes(self) -> list[Solution] - Get all buggy nodes that could be debugged.
• good_nodes(self) -> list[Solution] - Get all non-buggy nodes with valid performance.
• best_node(self) -> Solution | None - Get best performing solution.
• best_performance(self) -> float - Get best performance achieved so far.
• get_history(self, limit: int) -> list[dict] - Get recent search history for agent consumption.
• summarize(self) -> str - Generate text summary of search progress.
• get_improvement_trend(self, window: int) -> float - Calculate improvement trend over recent successful iterations.
• failure_rate(self) -> float - Calculate overall failure rate.
• get_tree_depth(self) -> int - Get maximum depth of the search tree.
• get_successful_improvements(self, limit: int) -> list[Solution] - Get recent successful child nodes for learning.
• to_dict(self) -> dict - Serialize SearchJournal to dict for checkpointing.
• from_dict(d: dict) -> 'SearchJournal' - Deserialize SearchJournal from checkpoint dict.

search/policy.py

Search policy abstract base class.

SearchPolicy - Search strategy for selecting which solution node to expand next.

• decide_next_solution(self, journal: 'SearchJournal', context: 'BuildContext', iteration: int, max_iterations: int) -> Optional['Solution'] - Select which solution node to expand in the next iteration.
• should_stop(self, journal: 'SearchJournal', iteration: int, max_iterations: int) -> bool - Decide if search should terminate early.

search/tree_policy.py

Tree-search policy inspired by AIDE.

TreeSearchPolicy - AIDE-inspired tree-search with draft/debug/improve stages.

• __init__(self, num_drafts: int, debug_prob: float, max_debug_depth: int)
• decide_next_solution(self, journal: SearchJournal, context: BuildContext, iteration: int, max_iterations: int) -> Solution | None - Decide which solution node to expand next.
• should_stop(self, journal: SearchJournal, iteration: int, max_iterations: int) -> bool - Decide if search should terminate early.

templates/features/pipeline_fitter.py

Fit sklearn Pipeline on dataset.

Functions:

• fit_pipeline(dataset_uri: str, pipeline: Pipeline, target_columns: list[str], group_column: str | None) -> Pipeline - Fit sklearn Pipeline on the provided dataset.

templates/features/pipeline_runner.py

Apply fitted sklearn Pipeline to full dataset via Spark.

Functions:

• transform_dataset_via_spark(spark: SparkSession, dataset_uri: str, fitted_pipeline: Pipeline, output_uri: str, target_columns: list[str], pipeline_code: str, group_column: str | None) -> str - Apply fitted sklearn Pipeline to full dataset using Spark UDFs.

templates/inference/catboost_predictor.py

Standard CatBoost predictor - NO Plexe dependencies.

CatBoostPredictor - Standalone CatBoost predictor.

• __init__(self, model_dir: str)
• predict(self, x: pd.DataFrame) -> pd.DataFrame - Make predictions on input DataFrame.

templates/inference/keras_predictor.py

Standard Keras predictor - NO Plexe dependencies.

KerasPredictor - Standalone Keras predictor.

• __init__(self, model_dir: str)
• predict(self, x: pd.DataFrame) -> pd.DataFrame - Make predictions on input DataFrame.

templates/inference/lightgbm_predictor.py

Standard LightGBM predictor - NO Plexe dependencies.

LightGBMPredictor - Standalone LightGBM predictor.

• __init__(self, model_dir: str)
• predict(self, x: pd.DataFrame) -> pd.DataFrame - Make predictions on input DataFrame.

templates/inference/pytorch_predictor.py

Standard PyTorch predictor - NO Plexe dependencies.

PyTorchPredictor - Standalone PyTorch predictor.

• __init__(self, model_dir: str)
• predict(self, x: pd.DataFrame) -> pd.DataFrame - Make predictions on input DataFrame.

templates/inference/xgboost_predictor.py

Standard XGBoost predictor - NO Plexe dependencies.

XGBoostPredictor - Standalone XGBoost predictor.

• __init__(self, model_dir: str)
• predict(self, x: pd.DataFrame) -> pd.DataFrame - Make predictions on input DataFrame.

templates/training/train_catboost.py

Hardcoded robust CatBoost training loop.

Functions:

• train_catboost(untrained_model_path: Path, train_uri: str, val_uri: str, output_dir: Path, target_column: str) -> dict - Train CatBoost model directly (no Spark).
• main() - No description

templates/training/train_keras.py

Hardcoded robust Keras training loop.

Functions:

• train_keras(untrained_model_path: Path, train_uri: str, val_uri: str, output_dir: Path, target_column: str, epochs: int, batch_size: int) -> dict - Train Keras model directly.

templates/training/train_lightgbm.py

Hardcoded robust LightGBM training loop.

Functions:

• train_lightgbm(untrained_model_path: Path, train_uri: str, val_uri: str, output_dir: Path, target_column: str, group_column: str | None) -> dict - Train LightGBM model directly (no Spark).
• main() - No description

templates/training/train_pytorch.py

Hardcoded robust PyTorch training loop.

Functions:

• train_pytorch(untrained_model_path: Path, train_uri: str, val_uri: str, output_dir: Path, target_column: str, epochs: int, batch_size: int) -> dict - Train PyTorch model directly.

templates/training/train_xgboost.py

Hardcoded robust XGBoost training loop.

Functions:

• train_xgboost(untrained_model_path: Path, train_uri: str, val_uri: str, output_dir: Path, target_column: str, group_column: str | None) -> dict - Train XGBoost model directly (no Spark).
• main() - No description

tools/submission.py

Submission tools for agents.

Functions:

• get_save_pipeline_fn(context: BuildContext, sample_df: pd.DataFrame) - Factory: Returns pipeline submission function.
• get_save_pipeline_code_tool(context: BuildContext, train_sample_df: pd.DataFrame, val_sample_df: pd.DataFrame) - Factory: Returns pipeline code submission tool.
• get_save_model_fn(context: BuildContext, model_type: str, max_epochs: int) - Factory: Returns model submission function.
• get_submit_metric_choice_tool(context: BuildContext) - Factory: Returns metric choice submission tool for MetricSelectorAgent.
• get_register_statistical_profile_tool(context: BuildContext) - Factory: Returns statistical profile submission tool.
• get_register_layout_tool(context: BuildContext) - Factory: Returns layout detection submission tool.
• get_register_eda_report_tool(context: BuildContext) - Factory: Returns EDA report submission tool.
• get_save_split_uris_tool(context: BuildContext) - Factory: Returns split URI submission tool.
• get_save_sample_uris_tool(context: BuildContext) - Factory: Returns sample URIs submission tool.
• get_save_metric_implementation_fn(context: BuildContext) - Factory: Returns metric implementation submission function.
• get_validate_baseline_predictor_tool(context: BuildContext, val_sample_df) - Factory: Returns baseline predictor validation tool.
• get_save_baseline_code_tool(context: BuildContext, val_sample_df) - Factory: Returns baseline code saving tool.
• get_evaluate_baseline_performance_tool(context: BuildContext, val_sample_df) - Factory: Returns baseline performance evaluation tool.
• get_save_hypothesis_tool(context: BuildContext, expand_node_id: int) - Factory: Returns hypothesis submission tool for HypothesiserAgent.
• get_save_plan_tool(context: BuildContext, hypothesis: 'Hypothesis', allowed_model_types: list[str] | None) - Factory: Returns plan submission tool for PlannerAgent.
• get_save_insight_tool(insight_store: InsightStore) - Factory: Returns insight submission tool for InsightExtractorAgent.
• get_register_core_metrics_tool(context: BuildContext) - Factory: Returns core metrics submission tool for ModelEvaluatorAgent.
• get_register_diagnostic_report_tool(context: BuildContext) - Factory: Returns diagnostic report submission tool for ModelEvaluatorAgent.
• get_register_robustness_report_tool(context: BuildContext) - Factory: Returns robustness report submission tool for ModelEvaluatorAgent.
• get_register_explainability_report_tool(context: BuildContext) - Factory: Returns explainability report submission tool for ModelEvaluatorAgent.
• get_register_baseline_comparison_tool(context: BuildContext) - Factory: Returns baseline comparison submission tool for ModelEvaluatorAgent.
• get_register_final_evaluation_tool(context: BuildContext) - Factory: Returns final evaluation submission tool for ModelEvaluatorAgent.

utils/dashboard/discovery.py

Experiment discovery and metadata extraction for dashboard.

ExperimentMetadata - Metadata for a discovered experiment.

Functions:

• discover_experiments(workdir: Path) -> list[ExperimentMetadata] - Discover all experiments in workdir.
• load_experiment_checkpoints(experiment_path: Path) -> dict[str, dict] - Load all checkpoints for an experiment.

utils/dashboard/tabs/baselines.py

Baselines tab: Heuristic baseline info.

Functions:

• render_baselines(checkpoints, exp_path) - Render baselines tab.

utils/dashboard/tabs/data_preparation.py

Data Preparation tab: Splits, sample sizes, data preview.

Functions:

• render_data_preparation(checkpoints, exp_path) - Render data preparation tab.

utils/dashboard/tabs/data_understanding.py

Data Understanding tab: Layout, stats, task analysis, metric.

Functions:

• render_data_understanding(checkpoints, exp_path) - Render data understanding tab.

utils/dashboard/tabs/evaluation.py

Evaluation tab: Final test metrics, baseline comparison, diagnostics.

Functions:

• render_evaluation(checkpoints, exp_path) - Render evaluation tab.

utils/dashboard/tabs/model_package.py

Model Package tab: File structure, metadata.

Functions:

• render_model_package(exp_path) - Render model package tab.

utils/dashboard/tabs/overview.py

Overview tab: Phase progress, timeline, key metrics.

Functions:

• render_overview(exp_meta, checkpoints) - Render overview tab.

utils/dashboard/tabs/search_tree.py

Search Tree tab: Tree visualization, performance chart, insights.

Functions:

• render_search_tree(checkpoints, exp_path) - Render search tree tab.

utils/dashboard/theme.py

Custom theme and styling for dashboard.

Functions:

• apply_custom_theme() - Apply custom CSS for dense, professional layout.

utils/dashboard/utils.py

Utility functions for dashboard data loading.

Functions:

• load_report(exp_path: Path, report_name: str) -> dict | None - Load YAML report from DirNames.BUILD_DIR/reports/.
• load_code_file(file_path: Path) -> str | None - Load Python code file.
• load_parquet_sample(uri: str, limit: int) -> pd.DataFrame | None - Load first N rows from parquet file.
• get_parquet_row_count(uri: str) -> int | None - Get row count from parquet file.
• load_json_file(file_path: Path) -> dict | None - Load JSON file.

utils/litellm_wrapper.py

LiteLLM model wrapper with retry logic and optional post-call hook.

PlexeLiteLLMModel - LiteLLM model wrapper with automatic retries and an optional post-call hook.

• __init__(self, model_id: str, extra_headers: dict[str, str] | None, on_llm_call: Callable[[str, Any, int], None] | None)
• generate(self) - Generate with automatic retries, header injection, and post-call hook.
• chat(self) - Chat with automatic retries, header injection, and post-call hook.

utils/reporting.py

Utilities for saving agent reports to disk.

Functions:

• save_report(work_dir: Path, report_name: str, content: Any) -> Path - Save agent report to workdir/DirNames.BUILD_DIR/reports/ as YAML.

utils/s3.py

S3 utilities for downloading datasets.

Functions:

• download_s3_uri(s3_uri: str, local_dir: Path | None) -> str - Download S3 URI to local directory.

utils/tooling.py

This module provides utility functions for defining and managing tools for AI agents.

AgentInvocationError - Raised when an agent calls an @agentinspectable function with invalid arguments.

• __init__(self, func_name: str, help_text: str)

Functions:

• agentinspectable(func) - Decorator for functions intended to be made available for calling to AI agents using mechanisms

utils/tracing.py

OpenTelemetry tracing decorators for agents and tools.

Functions:

• setup_opentelemetry(config: Config) - Initialize OpenTelemetry tracing with backend-agnostic configuration.
• agent_span(name: str) - Wrap an agent call in a named span for observability.
• tool_span(fn) -> Callable - Wrap a tool call in a named span with tool metadata, including inputs and outputs.

validation/validators.py

Validation functions for pipelines, models, and other agent outputs.

Functions:

• validate_sklearn_pipeline(pipeline: Pipeline, sample_df: pd.DataFrame, target_columns: list[str]) -> tuple[bool, str] - Validate that an sklearn Pipeline is well-formed and functional.
• validate_pipeline_consistency(pipeline: Pipeline, train_sample: pd.DataFrame, val_sample: pd.DataFrame, target_columns: list[str]) -> tuple[bool, str] - Validate pipeline produces consistent output shape on train/val samples.
• validate_xgboost_params(params: dict[str, Any]) -> tuple[bool, str] - Validate XGBoost hyperparameters.
• validate_catboost_params(params: dict[str, Any]) -> tuple[bool, str] - Validate CatBoost hyperparameters.
• validate_model_definition(model_type: str, definition: dict[str, Any]) -> tuple[bool, str] - Validate model definition based on model type.
• validate_metric_function_object(func) -> tuple[bool, str] - Validate metric computation function object.
• validate_dataset_splits(spark, train_uri: str, val_uri: str, test_uri: str | None, expected_ratios: dict[str, float]) -> tuple[bool, str] - Validate that dataset splits were created correctly.
• validate_keras_model(model: Any, task_analysis: dict) -> tuple[bool, str] - Validate Keras 3 model structure.
• validate_keras_optimizer(optimizer: Any) -> tuple[bool, str] - Validate Keras 3 optimizer.
• validate_keras_loss(loss: Any) -> tuple[bool, str] - Validate Keras 3 loss function.

viz.py

Streamlit dashboard for plexe.

Functions:

• main() - No description

workflow.py

Main workflow orchestrator.

Functions:

• build_model(spark: SparkSession, train_dataset_uri: str, test_dataset_uri: str | None, user_id: str, intent: str, experiment_id: str, work_dir: Path, runner: TrainingRunner, search_policy: SearchPolicy, config: Config, integration: WorkflowIntegration, enable_final_evaluation: bool, on_checkpoint_saved: Callable[[str, Path, Path], None] | None, pause_points: list[str] | None, on_pause: Callable[[str], None] | None, user_feedback: dict | None) -> tuple[Solution, dict, EvaluationReport | None] | None - Main workflow orchestrator.
• sanitize_dataset_column_names(spark: SparkSession, dataset_uri: str, context: BuildContext) -> str - Sanitize column names by replacing special characters with underscores.
• analyze_data(spark: SparkSession, dataset_uri: str, context: BuildContext, config: Config, on_checkpoint_saved: Callable[[str, Path, Path], None] | None) - Phase 1: Layout detection + Statistical + ML task analysis + metric selection.
• prepare_data(spark: SparkSession, training_dataset_uri: str, test_dataset_uri: str | None, context: BuildContext, config: Config, integration: WorkflowIntegration, generate_test_set: bool, on_checkpoint_saved: Callable[[str, Path, Path], None] | None) - Phase 2: Split dataset and extract sample.
• build_baselines(spark: SparkSession, context: BuildContext, config: Config, on_checkpoint_saved: Callable[[str, Path, Path], None] | None) - Phase 3: Build baseline models.
• search_models(spark: SparkSession, context: BuildContext, runner: TrainingRunner, search_policy: SearchPolicy, config: Config, integration: WorkflowIntegration, on_checkpoint_saved: Callable[[str, Path, Path], None] | None, restored_journal: SearchJournal | None, restored_insight_store: InsightStore | None) -> Solution | None - Phase 4: Iterative tree-search for best model.
• retrain_on_full_dataset(spark: SparkSession, best_solution: Solution, context: BuildContext, runner: TrainingRunner, config: Config) -> Solution - Retrain best solution on FULL dataset.
• evaluate_final(spark: SparkSession, context: BuildContext, solution: Solution, config: Config, on_checkpoint_saved: Callable[[str, Path, Path], None] | None) -> dict - Phase 5: Final evaluation on test set sample.
• package_final_model(spark: SparkSession, context: BuildContext, solution: Solution, final_metrics: dict, on_checkpoint_saved: Callable[[str, Path, Path], None] | None) -> Path - Package all final deliverables into a unified directory.