prompt: We are currently solving the following issue within our repository. Here is the issue text:
  --- BEGIN ISSUE ---
  :wrench: Add default logging level environment variable
  ## Task
  
  Add a `LIGHTWOOD_LOG` environment variable that controls the default logging level for lightwood. It should be possible to set values for it so that `DEBUG`, `INFO`, `WARNING`, `ERROR` and `CRITICAL` are all possible options. The logger lightwood uses is declared and exported [here](https://github.com/mindsdb/lightwood/blob/stable/lightwood/helpers/log.py).
  
  ## Steps :male_detective: :female_detective: 
  
  - Fork the Lightwood repository, checkout the `staging` branch and from it create a new one.
  - Implement the necessary changes.
  - Check that only the appropriate logs are getting through. For this, you can run any of the integration tests, like [`test_boston_housing`](https://github.com/mindsdb/lightwood/blob/stable/tests/integration/basic/test_boston_housing.py), and analyze the output.
  - Make the PR and address any comments that reviewers might make.
  
  ## Additional rewards :1st_place_medal: 
  
  Each documentation PR brings :one:  point for entry into the draw for a :computer:  Deep Learning Laptop powered by the NVIDIA RTX 3080 Max-Q GPU or other swag :shirt: :bear: .  For more info check out https://mindsdb.com/hacktoberfest/
  
  --- END ISSUE ---
  
  Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
  --- BEGIN FILES ---
  Path: `lightwood/helpers/log.py`
  Content:
  ```
  1 import logging
  2 import os
  3 
  4 
  5 def initialize_log():
  6     pid = os.getpid()
  7     logging.basicConfig()
  8     log = logging.getLogger(f'lightwood-{pid}')
  9     log.setLevel(logging.DEBUG)
  10     return log
  11 
  12 
  13 log = initialize_log()
  14
  ```
  --- END FILES ---
  
  Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.
  
  Here is an example:
  
  ```diff
  diff --git a/examples/server_async.py b/examples/server_async.py
  --- a/examples/server_async.py
  +++ b/examples/server_async.py
  @@ -313,4 +313,4 @@
   
   
   if __name__ == "__main__":
  -    asyncio.run(run_async_server("."), debug=True)
  +    asyncio.run(run_async_server(), debug=True)
  diff --git a/examples/server_sync.py b/examples/server_sync.py
  --- a/examples/server_sync.py
  +++ b/examples/server_sync.py
  @@ -313,5 +313,5 @@
   
   
   if __name__ == "__main__":
  -    server = run_sync_server(".")
  +    server = run_sync_server()
       server.shutdown()
  
  ```
  
golden_diff: diff --git a/lightwood/helpers/log.py b/lightwood/helpers/log.py
  --- a/lightwood/helpers/log.py
  +++ b/lightwood/helpers/log.py
  @@ -6,7 +6,8 @@
       pid = os.getpid()
       logging.basicConfig()
       log = logging.getLogger(f'lightwood-{pid}')
  -    log.setLevel(logging.DEBUG)
  +    log_level = os.environ.get('LIGHTWOOD_LOG', 'DEBUG')
  +    log.setLevel(log_level)
       return log
  
verification_info: {"golden_diff": "diff --git a/lightwood/helpers/log.py b/lightwood/helpers/log.py\n--- a/lightwood/helpers/log.py\n+++ b/lightwood/helpers/log.py\n@@ -6,7 +6,8 @@\n     pid = os.getpid()\n     logging.basicConfig()\n     log = logging.getLogger(f'lightwood-{pid}')\n-    log.setLevel(logging.DEBUG)\n+    log_level = os.environ.get('LIGHTWOOD_LOG', 'DEBUG')\n+    log.setLevel(log_level)\n     return log\n", "issue": ":wrench: Add default logging level environment variable\n## Task\r\n\r\nAdd a `LIGHTWOOD_LOG` environment variable that controls the default logging level for lightwood. It should be possible to set values for it so that `DEBUG`, `INFO`, `WARNING`, `ERROR` and `CRITICAL` are all possible options. The logger lightwood uses is declared and exported [here](https://github.com/mindsdb/lightwood/blob/stable/lightwood/helpers/log.py).\r\n\r\n## Steps :male_detective: :female_detective: \r\n\r\n- Fork the Lightwood repository, checkout the `staging` branch and from it create a new one.\r\n- Implement the necessary changes.\r\n- Check that only the appropriate logs are getting through. For this, you can run any of the integration tests, like [`test_boston_housing`](https://github.com/mindsdb/lightwood/blob/stable/tests/integration/basic/test_boston_housing.py), and analyze the output.\r\n- Make the PR and address any comments that reviewers might make.\r\n\r\n## Additional rewards :1st_place_medal: \r\n\r\nEach documentation PR brings :one:  point for entry into the draw for a :computer:  Deep Learning Laptop powered by the NVIDIA RTX 3080 Max-Q GPU or other swag :shirt: :bear: .  For more info check out https://mindsdb.com/hacktoberfest/\n", "before_files": [{"content": "import logging\nimport os\n\n\ndef initialize_log():\n    pid = os.getpid()\n    logging.basicConfig()\n    log = logging.getLogger(f'lightwood-{pid}')\n    log.setLevel(logging.DEBUG)\n    return log\n\n\nlog = initialize_log()\n", "path": "lightwood/helpers/log.py"}], "after_files": [{"content": "import logging\nimport os\n\n\ndef initialize_log():\n    pid = os.getpid()\n    logging.basicConfig()\n    log = logging.getLogger(f'lightwood-{pid}')\n    log_level = os.environ.get('LIGHTWOOD_LOG', 'DEBUG')\n    log.setLevel(log_level)\n    return log\n\n\nlog = initialize_log()\n", "path": "lightwood/helpers/log.py"}]}