Use existing downloader system for NNArchive blob

.gitignore

@@ -37,3 +37,5 @@ _builds/
 
 # clangd cache
 .cache/
+
+/env

bindings/python/examples/install_requirements.py

@@ -4,9 +4,6 @@
 import argparse
 import re
 import platform
-import urllib.request
-import shutil
-
 
 convert_default = "empty"
 parser = argparse.ArgumentParser()
@@ -182,16 +179,6 @@ def hasWhitespace(string):
         else:
             subprocess.check_call(cmd)
 
-nn_archive_filename=f"{examples_dir}/models/yolo-v6-openvino_2022.1_6shave-rvc2.tar.xz"
-nn_archive_url="https://artifacts.luxonis.com/artifactory/luxonis-depthai-data-local/network/nnarchive/yolo-v6-openvino_2022.1_6shave-rvc2.tar.xz"
-nn_archive_req = urllib.request.Request(
-    nn_archive_url, headers={"User-Agent": "Mozilla/5.0"}
-)
-with urllib.request.urlopen(nn_archive_req) as response, open(
-    nn_archive_filename, "wb"
-) as out_file:
-    shutil.copyfileobj(response, out_file)
-
 if requireOpenCv and thisPlatform == "aarch64":
     from os import environ
     OPENBLAS_CORE_TYPE = environ.get('OPENBLAS_CORE_TYPE')

bindings/python/examples/models/nn-archive/model.yml

@@ -0,0 +1,12 @@
+description: >-
+  nn-archive
+task_type: object_attributes
+files:
+  - name: yolo-v6-openvino_2022.1_6shave-rvc2.tar.xz
+    size: 8522072
+    sha256: 5e6f280597d58ff669a827b41c12222e63fab10e58ddd8d9b402c19fd21d7130
+    source: https://artifacts.luxonis.com/artifactory/luxonis-depthai-data-local/network/nnarchive/yolo-v6-openvino_2022.1_6shave-rvc2.tar.xz
+
+
+framework: dldt
+license: https://raw.githubusercontent.com/openvinotoolkit/open_model_zoo/master/LICENSE