Scripts: Make Start.bat idiotproof

Start now creates a venv, installs the correct requirements, and
starts the API.

Signed-off-by: kingbri <[email protected]>

start.bat

@@ -0,0 +1,11 @@
+:: From https://github.com/jllllll/windows-venv-installers/blob/main/Powershell/run-ps-script.cmd
+@echo off
+
+set SCRIPT_NAME=start.ps1
+
+:: This will run the Powershell script named above in the current directory
+:: This is intended for systems who have not changed the script execution policy from default
+:: These systems will be unable to directly execute Powershell scripts unless done through CMD.exe like below
+
+if not exist "%~dp0\%SCRIPT_NAME%" ( echo %SCRIPT_NAME% not found! && pause && goto eof )
+call powershell.exe -executionpolicy Bypass ". '%~dp0\start.ps1' %*"

start.ps1

@@ -0,0 +1,68 @@
+# Arg parsing
+param(
+    [switch]$ignore_upgrade = $false,
+    [switch]$activate_venv = $false
+)
+
+# Gets the currently installed CUDA version
+function GetRequirementsFile {
+    $GpuInfo = (Get-WmiObject Win32_VideoController).Name
+    if ($GpuInfo.Contains("AMD")) {
+        Write-Output "AMD/ROCm isn't supported on Windows. Please switch to linux."
+        exit
+    }
+
+    $CudaPath = $env:CUDA_PATH
+    $CudaVersion = Split-Path $CudaPath -Leaf
+
+    # Decide requirements based on CUDA version
+    if ($CudaVersion.Contains("12")) {
+        return "requirements"
+    } elseif ($CudaVersion.Contains("11.8")) {
+        return "requirements-cu118"
+    } else {
+        Write-Output "Script cannot find your CUDA installation. installing from requirements-nowheel.txt"
+        return "requirements-nowheel"
+    }
+}
+
+# Make a venv and enter it
+function CreateAndActivateVenv {
+    # Is the user using conda?
+    if ($null -ne $env:CONDA_PREFIX) {
+        Write-Output "It looks like you're in a conda environment. Skipping venv check."
+        return
+    }
+
+    $VenvDir = "$PSScriptRoot\venv"
+
+    if (!(Test-Path -Path $VenvDir)) {
+        Write-Output "Venv doesn't exist! Creating one for you."
+        python -m venv venv
+    }
+
+    . "$VenvDir\Scripts\activate.ps1"
+
+    if ($activate_venv) {
+        Write-Output "Stopping at venv activation due to user request."
+        exit
+    }
+}
+
+# Entrypoint for API start
+function StartAPI {
+    pip -V
+    if ($ignore_upgrade) {
+        Write-Output "Ignoring pip dependency upgrade due to user request."
+    } else {
+        pip install --upgrade -r "$RequirementsFile.txt"
+    }
+
+    python main.py
+}
+
+# Navigate to the script directory
+Set-Location $PSScriptRoot
+$RequirementsFile = GetRequirementsFile
+CreateAndActivateVenv
+StartAPI