(torchx/components) Remove dependency to pyre_extensions

Summary: There was only a single usage of `pyre_extensions` in the entire code base. Get rid of this dependency by using an `assert` statement rather than `pyre_extensions.none_throws`.

Reviewed By: highker

Differential Revision: D77621041

Author: kiukchung

requirements.txt

@@ -1,4 +1,3 @@
-pyre-extensions
 docstring-parser>=0.8.1
 importlib-metadata
 pyyaml

torchx/components/structured_arg.py

@@ -30,8 +30,6 @@
 from pathlib import Path
 from typing import Optional
 
-from pyre_extensions import none_throws
-
 from torchx import specs
 
 
@@ -148,7 +146,8 @@ def parse_from(
             if m:  # use the last module name
                 run_name = m.rpartition(".")[2]
             else:  # use script name w/ no extension
-                run_name = Path(none_throws(script)).stem
+                assert script, "`script` can't be `None` here due checks above"
+                run_name = Path(script).stem
         return StructuredNameArgument(
             experiment_name or default_experiment_name, run_name
         )