Update base for Update on "Remove old TORCH_VERSION variables"

**Summary:** As a follow-up to #2719,
which deprecated these variables in 0.13.0, we remove them now in
the next release 0.15.0.

**Test Plan:** CI

[ghstack-poisoned]

Author: andrewor14

benchmarks/float8/training/llama4.sh renamed to benchmarks/float8/training/bench.sh

@@ -7,17 +7,20 @@
 # This script can be used to launch a torchtitan float8 training run
 # with the given parameters,
 
-# script arguments
-LOCAL_BATCH_SIZE=${LOCAL_BATCH_SIZE:-1}
-STEPS=${STEPS:-100}
-
 # temporary log file which is deleted after performance data is parsed out and metrics are calculated.
-LOG_FILE="/tmp/float8_training_log.txt"
+LOG_FILE="/tmp/torchtitan_logs.txt"
 
-# validate user has specified torchtitan root directory
+# validate user has specified required args
 if [ -z "${TORCHTITAN_ROOT}" ]; then
-  echo "Error: TORCHTITAN environment variable is not set. Please set it before running this script."
-  echo "Usage: TORCHTITAN_ROOT=<directory> ./torchtitan_llama4.sh"
+  echo "Error: TORCHTITAN_ROOT environment variable is not set. Please set it before running this script."
+  echo "Usage: TORCHTITAN_ROOT=<directory> CONFIG_FILE=<model toml> ./moe.sh"
+  echo " * EXTRA_ARGS: additional arguments to pass to the torchtitan training script."
+  exit 1
+fi
+
+if [ -z "${CONFIG_FILE}" ]; then
+  echo "Error: CONFIG_FILE environment variable is not set. Please set it before running this script."
+  echo "Usage: TORCHTITAN_ROOT=<directory> CONFIG_FILE=<model toml> ./moe.sh"
   echo " * EXTRA_ARGS: additional arguments to pass to the torchtitan training script."
   exit 1
 fi
@@ -29,7 +32,7 @@ original_dir=$(pwd)
 cd ${TORCHTITAN_ROOT}
 
 # run the command with the specified arguments
-CONFIG_FILE="./torchtitan/experiments/llama4/train_configs/debug_model.toml" ${TORCHTITAN_ROOT}/run_train.sh  ${EXTRA_ARGS} 2>&1 | tee ${LOG_FILE}
+${TORCHTITAN_ROOT}/run_train.sh  ${EXTRA_ARGS} 2>&1 | tee ${LOG_FILE}
 
 # return to original working directory
 cd $original_dir