fix(nyz): downgrade pyecharts log level to warning and polish install…

…ation doc (#838)

README.md

@@ -150,12 +150,6 @@ You can simply install DI-engine from PyPI with the following command:
 pip install DI-engine
 ```
 
-If you use Anaconda or Miniconda, you can install DI-engine from conda-forge through the following command:
-
-```bash
-conda install -c opendilab di-engine
-```
-
 For more information about installation, you can refer to [installation](https://di-engine-docs.readthedocs.io/en/latest/01_quickstart/installation.html).
 
 And our dockerhub repo can be found [here](https://hub.docker.com/repository/docker/opendilab/ding)，we prepare `base image` and `env image` with common RL environments.

ding/utils/memory_helper.py

@@ -9,7 +9,7 @@
     import pyecharts
 except ImportError:
     import logging
-    logging.error("Please install pyecharts first, you can install it by running 'pip install pyecharts'")
+    logging.warning("Please install pyecharts first, you can install it by running 'pip install pyecharts'")
     pyecharts = None
 
 MegaByte = 1024 * 1024