Allow to set NLTK options via TabPy config

docs/server-config.md

@@ -91,6 +91,11 @@ at [`logging.config` documentation page](https://docs.python.org/3.6/library/log
   value - `30`. This timeout does not apply when evaluating models either
   through the `/query` method, or using the `tabpy.query(...)` syntax with
   the `/evaluate` method.
+
+`[nltk]` parameters:
+
+- `NLTK_DOWNLOAD_PATH` - Set the NLTK download path. Defaul '~/nltk_data'.
+- `NLTK_PROXY` - Set the proxy server used for for NLTK `nltk.download()`.
 
 ### Configuration File Example
 
@@ -130,6 +135,14 @@ settings._
 # The value should be a float representing the timeout time in seconds.
 # TABPY_EVALUATE_TIMEOUT = 30
 
+[nltk]
+# Set the download directory for nltk downloads.
+# NLTK_DOWNLOAD_PATH = ~/nltk_data
+
+# If TabPy is behind a proxy and it needs to connect to the internet for
+# some tasks, you can define a proxy here.
+# NLTK_PROXY = http://proxy:3128
+
 [loggers]
 keys=root
 

tabpy/models/scripts/SentimentAnalysis.py

@@ -1,3 +1,4 @@
+import sys
 from textblob import TextBlob
 import nltk
 from nltk.sentiment.vader import SentimentIntensityAnalyzer
@@ -10,8 +11,18 @@
 ssl._create_default_https_context = _ctx
 
 
-nltk.download("vader_lexicon")
-nltk.download("punkt")
+def setup():
+    file_path = sys.argv[1] if len(sys.argv) > 1 else setup_utils.get_default_config_file_path()
+    config = setup_utils.get_config(file_path)
+    download_dir = None
+    if "nltk" in config:
+        nltk_config = config["nltk"]
+        download_dir = nltk_config.get("NLTK_DOWNLOAD_PATH")
+        if "NLTK_PROXY" in nltk_config:
+            nltk.set_proxy(nltk_config["NLTK_PROXY"])
+
+    nltk.download("vader_lexicon", download_dir=download_dir)
+    nltk.download("punkt", download_dir=download_dir)
 
 
 def SentimentAnalysis(_arg1, library="nltk"):
@@ -45,6 +56,7 @@ def SentimentAnalysis(_arg1, library="nltk"):
 
 
 if __name__ == "__main__":
+    setup()
     setup_utils.deploy_model(
         "Sentiment Analysis",
         SentimentAnalysis,

tabpy/models/utils/setup_utils.py

@@ -13,10 +13,14 @@ def get_default_config_file_path():
     return config_file_path
 
 
-def parse_config(config_file_path):
+def get_config(config_file_path):
     config = configparser.ConfigParser()
     config.read(config_file_path)
-    tabpy_config = config["TabPy"]
+    return config
+
+
+def parse_config(config_file_path):
+    tabpy_config = get_config(config_file_path)["TabPy"]
 
     port = 9004
     if "TABPY_PORT" in tabpy_config: