clip cache settings to permissible values; remove redundant imports in install __init__ file

invokeai/backend/install/invokeai_configure.py

@@ -21,7 +21,6 @@ from argparse import Namespace
 from enum import Enum
 from pathlib import Path
 from shutil import get_terminal_size
-from typing import get_type_hints
 from urllib import request
 
 import npyscreen
@@ -399,7 +398,7 @@ Use cursor arrows to make a checkbox selection, and space to toggle.
         self.max_cache_size = self.add_widget_intelligent(
             IntTitleSlider,
             name="RAM cache size (GB). Make this at least large enough to hold a single full model.",
-            value=old_opts.max_cache_size,
+            value=clip(old_opts.max_cache_size, range=(3.0, MAX_RAM)),
             out_of=MAX_RAM,
             lowest=3,
             begin_entry_at=6,
@@ -418,7 +417,7 @@ Use cursor arrows to make a checkbox selection, and space to toggle.
             self.nextrely -= 1
             self.max_vram_cache_size = self.add_widget_intelligent(
                 npyscreen.Slider,
-                value=old_opts.max_vram_cache_size,
+                value=clip(old_opts.max_vram_cache_size, range=(0, MAX_VRAM)),
                 out_of=round(MAX_VRAM * 2) / 2,
                 lowest=0.0,
                 relx=8,
@@ -596,6 +595,16 @@ def default_user_selections(program_opts: Namespace) -> InstallSelections:
     )
 
 
+# -------------------------------------
+def clip(value: float, range: tuple[float, float]) -> float:
+    minimum, maximum = range
+    if value < minimum:
+        value = minimum
+    if value > maximum:
+        value = maximum
+    return value
+
+
 # -------------------------------------
 def initialize_rootdir(root: Path, yes_to_all: bool = False):
     logger.info("Initializing InvokeAI runtime directory")

invokeai/backend/install/migrate_to_3.py

@@ -591,7 +591,6 @@ script, which will perform a full upgrade in place.""",
     # TODO: revisit - don't rely on invokeai.yaml to exist yet!
     dest_is_setup = (dest_root / "models/core").exists() and (dest_root / "databases").exists()
     if not dest_is_setup:
-        import invokeai.frontend.install.invokeai_configure
         from invokeai.backend.install.invokeai_configure import initialize_rootdir
 
         initialize_rootdir(dest_root, True)