fix: load faiss before torch, remove some module imports from the cri…

…tical path (#180)

fix: load faiss before torch and move some module imports from the critical path

src/encord_active/cli/main.py

@@ -17,9 +17,6 @@
 from encord_active.cli.utils.decorators import bypass_streamlit_question, ensure_project
 from encord_active.cli.utils.prints import success_with_visualise_command
 from encord_active.lib import constants as ea_constants
-from encord_active.lib.metrics.execute import run_metrics, run_metrics_by_embedding_type
-from encord_active.lib.metrics.heuristic.img_features import AreaMetric
-from encord_active.lib.metrics.metric import EmbeddingType
 
 
 class OrderedPanelGroup(TyperGroup):
@@ -162,6 +159,12 @@ def import_local_project(
 
     By default, all jpeg, jpg, png, and tiff files will be matched.
     """
+    from encord_active.lib.metrics.execute import (
+        run_metrics,
+        run_metrics_by_embedding_type,
+    )
+    from encord_active.lib.metrics.heuristic.img_features import AreaMetric
+    from encord_active.lib.metrics.metric import EmbeddingType
     from encord_active.lib.project.local import (
         NoFilesFoundError,
         ProjectExistsError,

src/encord_active/cli/print.py

@@ -5,14 +5,10 @@
 
 import rich
 import typer
-from encord.ontology import OntologyStructure
 from rich.markup import escape
 
 from encord_active.cli.config import app_config
 from encord_active.cli.utils.decorators import ensure_project
-from encord_active.lib.model_predictions.writer import (
-    iterate_classification_attribute_options,
-)
 
 print_cli = typer.Typer(rich_markup_mode="markdown")
 
@@ -48,8 +44,12 @@ def print_ontology(
     """
     [bold]Prints[/bold] an ontology mapping between the class name to the `featureNodeHash` JSON format.
     """
+    from encord.ontology import OntologyStructure
     from rich.panel import Panel
 
+    from encord_active.lib.model_predictions.writer import (
+        iterate_classification_attribute_options,
+    )
     from encord_active.lib.project.project_file_structure import ProjectFileStructure
 
     fs = ProjectFileStructure(target)

src/encord_active/lib/metrics/execute.py

@@ -6,6 +6,10 @@
 from typing import Callable, List, Optional, Sequence, Tuple, Type, Union
 
 import cv2
+
+# NOTE: this statement enusres faiss is imported before torch.
+# removing it will trigger segmentation faults in certain metrics
+import faiss  # pylint: disable=unused-import
 from loguru import logger
 
 from encord_active.lib.common.iterator import DatasetIterator, Iterator