[ci] speed up files downloading for Windows CI (#3682)

* speed up files downloading for Windows CI

* run CI

* revert changing CI branch

.ci/install_opencl.ps1

 Write-Output "Installing OpenCL CPU platform"
 
-$cache = "$env:PIPELINE_WORKSPACE\opencl_windows-amd_cpu-v3_0_130_135"
 $installer = "AMD-APP-SDKInstaller-v3.0.130.135-GA-windows-F-x64.exe"
 
-if ($env:OPENCL_INSTALLER_FOUND -ne 'true') {
-  # Pipeline cache miss; download OpenCL platform installer executable into workspace cache
-  Write-Output "Downloading OpenCL platform installer"
-  Invoke-WebRequest -OutFile "$installer" -Uri "https://github.com/microsoft/LightGBM/releases/download/v2.0.12/$installer"
+Write-Output "Downloading OpenCL platform installer"
+$ProgressPreference = "SilentlyContinue"  # progress bar bug extremely slows down download speed
+Invoke-WebRequest -OutFile "$installer" -Uri "https://github.com/microsoft/LightGBM/releases/download/v2.0.12/$installer"
 
-  Write-Output "Caching OpenCL platform installer"
-  New-Item $cache -ItemType Directory | Out-Null
-  Move-Item -Path "$installer" -Destination "$cache\$installer" | Out-Null
-
-  if (Test-Path "$cache\$installer") {
-    Write-Output "Successfully downloaded OpenCL platform installer"
-  } else {
-    Write-Output "Unable to download OpenCL platform installer"
-    Write-Output "Setting EXIT"
-    $host.SetShouldExit(-1)
-    Exit -1
-  }
+if (Test-Path "$installer") {
+  Write-Output "Successfully downloaded OpenCL platform installer"
+} else {
+  Write-Output "Unable to download OpenCL platform installer"
+  Write-Output "Setting EXIT"
+  $host.SetShouldExit(-1)
+  Exit -1
 }
 
-# Install OpenCL platform from installer executable expected in workspace cache
+# Install OpenCL platform from installer executable
 Write-Output "Running OpenCL installer"
-Invoke-Command -ScriptBlock {Start-Process "$cache\$installer" -ArgumentList '/S /V"/quiet /norestart /passive /log opencl.log"' -Wait}
+Invoke-Command -ScriptBlock { Start-Process "$installer" -ArgumentList '/S /V"/quiet /norestart /passive /log opencl.log"' -Wait }
 
 $property = Get-ItemProperty -Path Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Khronos\OpenCL\Vendors
 if ($property -eq $null) {

.ci/test_r_package_windows.ps1

@@ -5,6 +5,7 @@ function Download-File-With-Retries {
     [string]$url,
     [string]$destfile
   )
+  $ProgressPreference = "SilentlyContinue"  # progress bar bug extremely slows down download speed
   do {
     Write-Output "Downloading ${url}"
     sleep 5;

.ci/test_windows.ps1

@@ -40,6 +40,7 @@ elseif ($env:TASK -eq "sdist") {
   cd dist; pip install @(Get-ChildItem *.gz) -v ; Check-Output $?
 
   $env:JAVA_HOME = $env:JAVA_HOME_8_X64  # there is pre-installed Zulu OpenJDK-8 somewhere
+  $ProgressPreference = "SilentlyContinue"  # progress bar bug extremely slows down download speed
   Invoke-WebRequest -Uri "https://github.com/microsoft/LightGBM/releases/download/v2.0.12/swigwin-3.0.12.zip" -OutFile $env:BUILD_SOURCESDIRECTORY/swig/swigwin.zip -UserAgent "NativeHost"
   Add-Type -AssemblyName System.IO.Compression.FileSystem
   [System.IO.Compression.ZipFile]::ExtractToDirectory("$env:BUILD_SOURCESDIRECTORY/swig/swigwin.zip", "$env:BUILD_SOURCESDIRECTORY/swig")

.vsts-ci.yml

@@ -124,13 +124,6 @@ jobs:
       Write-Host "##vso[task.prependpath]$env:CONDA\Scripts"
       Write-Host "##vso[task.setvariable variable=AZURE]true"
     displayName: 'Set Variables'
-  - task: Cache@2
-    inputs:
-      key: '"opencl.windows" | "amd.cpu" | "v3.0.130.135" | "1"'
-      path: $(Pipeline.Workspace)/opencl_windows-amd_cpu-v3_0_130_135
-      cacheHitVar: OPENCL_INSTALLER_FOUND
-    condition: eq(variables['TASK'], 'bdist')
-    displayName: 'Cache OpenCL Installer'
   - script: |
       cmd /c "powershell -ExecutionPolicy Bypass -File %BUILD_SOURCESDIRECTORY%/.ci/install_opencl.ps1"
     condition: eq(variables['TASK'], 'bdist')