我是H2o的新手。根据文档，我为Python安装了H2o
$ pip install h2o然后：
输入：
import h2oh2o.init()输出：
OSError Traceback (most recent call last)<ipython-input-1-07f8bb8f27db> in <module>() 1 import h2o----> 2 h2o.init()/usr/local/lib/python3.5/site-packages/h2o/h2o.py in init(ip, port, start_h2o, enable_assertions, license, nthreads, max_mem_size, min_mem_size, ice_root, strict_version_check, proxy, https, insecure, username, password, max_mem_size_GB, min_mem_size_GB, proxies, size) 849 nthreads=nthreads,max_mem_size=max_mem_size,min_mem_size=min_mem_size,ice_root=ice_root, 850 strict_version_check=strict_version_check,proxy=proxy,https=https,insecure=insecure,username=username,--> 851 password=password,max_mem_size_GB=max_mem_size_GB,min_mem_size_GB=min_mem_size_GB,proxies=proxies,size=size) 852 return None 853 /usr/local/lib/python3.5/site-packages/h2o/connection.py in __init__(self, ip, port, start_h2o, enable_assertions, license, nthreads, max_mem_size, min_mem_size, ice_root, strict_version_check, proxy, https, insecure, username, password, max_mem_size_GB, min_mem_size_GB, proxies, size) 173 raise EnvironmentError("Version mismatch. H2O is version {0}, but the h2o-python package is version {1}. " 174 "This is a developer build, please contact your developer."--> 175 "".format(ver_h2o, str(ver_pkg))) 176 else: 177 raise EnvironmentError("Version mismatch. H2O is version {0}, but the h2o-python package is version {1}. "OSError: Version mismatch. H2O is version 3.8.2.99999, but the h2o-python package is version 3.8.2.6-1. This is a developer build, please contact your developer.从这个网站，我尝试按以下方式解决这个问题：
h2o.shutdown然后：
user@MacBook-Pro-of-User:~$ pip3 uninstall h2oUninstalling h2o-3.8.2.6-1: /usr/local/h2o_data/iris.csv /usr/local/h2o_data/prostate.csv /usr/local/h2o_jar/h2o.jar /usr/local/lib/python3.5/site-packages/h2o-3.8.2.6_1.dist-info/DESCRIPTION.rst /usr/local/lib/python3.5/site-packages/h2o-3.8.2.6_1.dist-info/INSTALLER /usr/local/lib/python3.5/site-packages/h2o-3.8.2.6_1.dist-info/METADATA /usr/local/lib/python3.5/site-packages/h2o-3.8.2.6_1.dist-info/RECORD /usr/local/lib/python3.5/site-packages/h2o-3.8.2.6_1.dist-info/WHEEL /usr/local/lib/python3.5/site-packages/h2o-3.8.2.6_1.dist-info/metadata.json /usr/local/lib/python3.5/site-packages/h2o-3.8.2.6_1.dist-info/top_level.txt /usr/local/lib/python3.5/site-packages/h2o/__init__.py /usr/local/lib/python3.5/site-packages/h2o/__pycache__/__init__.cpython-35.pyc /usr/local/lib/python3.5/site-packages/h2o/__pycache__/assembly.cpython-35.pyc /usr/local/lib/python3.5/site-packages/h2o/__pycache__/astfun.cpython-35.pyc /usr/local/lib/python3.5/site-packages/h2o/__pycache__/connection.cpython-35.pyc /usr/local/lib/python3.5/site-packages/h2o/__pycache__/cross_validation.cpython-35.pyc /usr/local/lib/python3.5/site-packages/h2o/__pycache__/demo.cpython-35.pyc /usr/local/lib/python3.5/site-packages/h2o/__pycache__/display.cpython-35.pyc /usr/local/lib/python3.5/site-packages/h2o/__pycache__/expr.cpython-35.pyc /usr/local/lib/python3.5/site-packages/h2o/__pycache__/frame.cpython-35.pyc /usr/local/lib/python3.5/site-packages/h2o/__pycache__/group_by.cpython-35.pyc /usr/local/lib/python3.5/site-packages/h2o/__pycache__/h2o.cpython-35.pyc /usr/local/lib/python3.5/site-packages/h2o/__pycache__/h2o_logging.cpython-35.pyc /usr/local/lib/python3.5/site-packages/h2o/__pycache__/job.cpython-35.pyc /usr/local/lib/python3.5/site-packages/h2o/__pycache__/two_dim_table.cpython-35.pyc /usr/local/lib/python3.5/site-packages/h2o/assembly.py /usr/local/lib/python3.5/site-packages/h2o/astfun.py /usr/local/lib/python3.5/site-packages/h2o/connection.py /usr/local/lib/python3.5/site-packages/h2o/cross_validation.py /usr/local/lib/python3.5/site-packages/h2o/demo.py /usr/local/lib/python3.5/site-packages/h2o/display.py /usr/local/lib/python3.5/site-packages/h2o/estimators/__init__.py /usr/local/lib/python3.5/site-packages/h2o/estimators/__pycache__/__init__.cpython-35.pyc /usr/local/lib/python3.5/site-packages/h2o/estimators/__pycache__/deeplearning.cpython-35.pyc /usr/local/lib/python3.5/site-packages/h2o/estimators/__pycache__/estimator_base.cpython-35.pyc /usr/local/lib/python3.5/site-packages/h2o/estimators/__pycache__/gbm.cpython-35.pyc /usr/local/lib/python3.5/site-packages/h2o/estimators/__pycache__/glm.cpython-35.pyc /usr/local/lib/python3.5/site-packages/h2o/estimators/__pycache__/glrm.cpython-35.pyc /usr/local/lib/python3.5/site-packages/h2o/estimators/__pycache__/kmeans.cpython-35.pyc /usr/local/lib/python3.5/site-packages/h2o/estimators/__pycache__/naive_bayes.cpython-35.pyc /usr/local/lib/python3.5/site-packages/h2o/estimators/__pycache__/random_forest.cpython-35.pyc /usr/local/lib/python3.5/site-packages/h2o/estimators/deeplearning.py /usr/local/lib/python3.5/site-packages/h2o/estimators/estimator_base.py /usr/local/lib/python3.5/site-packages/h2o/estimators/gbm.py /usr/local/lib/python3.5/site-packages/h2o/estimators/glm.py /usr/local/lib/python3.5/site-packages/h2o/estimators/glrm.py /usr/local/lib/python3.5/site-packages/h2o/estimators/kmeans.py /usr/local/lib/python3.5/site-packages/h2o/estimators/naive_bayes.py /usr/local/lib/python3.5/site-packages/h2o/estimators/random_forest.py /usr/local/lib/python3.5/site-packages/h2o/expr.py /usr/local/lib/python3.5/site-packages/h2o/frame.py /usr/local/lib/python3.5/site-packages/h2o/grid/__init__.py /usr/local/lib/python3.5/site-packages/h2o/grid/__pycache__/__init__.cpython-35.pyc /usr/local/lib/python3.5/site-packages/h2o/grid/__pycache__/grid_search.cpython-35.pyc /usr/local/lib/python3.5/site-packages/h2o/grid/__pycache__/metrics.cpython-35.pyc /usr/local/lib/python3.5/site-packages/h2o/grid/grid_search.py /usr/local/lib/python3.5/site-packages/h2o/grid/metrics.py /usr/local/lib/python3.5/site-packages/h2o/group_by.py /usr/local/lib/python3.5/site-packages/h2o/h2o.py /usr/local/lib/python3.5/site-packages/h2o/h2o_logging.py /usr/local/lib/python3.5/site-packages/h2o/job.py /usr/local/lib/python3.5/site-packages/h2o/model/__init__.py /usr/local/lib/python3.5/site-packages/h2o/model/__pycache__/__init__.cpython-35.pyc /usr/local/lib/python3.5/site-packages/h2o/model/__pycache__/autoencoder.cpython-35.pyc /usr/local/lib/python3.5/site-packages/h2o/model/__pycache__/binomial.cpython-35.pyc /usr/local/lib/python3.5/site-packages/h2o/model/__pycache__/clustering.cpython-35.pyc /usr/local/lib/python3.5/site-packages/h2o/model/__pycache__/confusion_matrix.cpython-35.pyc /usr/local/lib/python3.5/site-packages/h2o/model/__pycache__/dim_reduction.cpython-35.pyc /usr/local/lib/python3.5/site-packages/h2o/model/__pycache__/metrics_base.cpython-35.pyc /usr/local/lib/python3.5/site-packages/h2o/model/__pycache__/model_base.cpython-35.pyc /usr/local/lib/python3.5/site-packages/h2o/model/__pycache__/model_builder.cpython-35.pyc /usr/local/lib/python3.5/site-packages/h2o/model/__pycache__/model_future.cpython-35.pyc /usr/local/lib/python3.5/site-packages/h2o/model/__pycache__/multinomial.cpython-35.pyc /usr/local/lib/python3.5/site-packages/h2o/model/__pycache__/regression.cpython-35.pyc /usr/local/lib/python3.5/site-packages/h2o/model/autoencoder.py /usr/local/lib/python3.5/site-packages/h2o/model/binomial.py /usr/local/lib/python3.5/site-packages/h2o/model/clustering.py /usr/local/lib/python3.5/site-packages/h2o/model/confusion_matrix.py /usr/local/lib/python3.5/site-packages/h2o/model/dim_reduction.py /usr/local/lib/python3.5/site-packages/h2o/model/metrics_base.py /usr/local/lib/python3.5/site-packages/h2o/model/model_base.py /usr/local/lib/python3.5/site-packages/h2o/model/model_builder.py /usr/local/lib/python3.5/site-packages/h2o/model/model_future.py /usr/local/lib/python3.5/site-packages/h2o/model/multinomial.py /usr/local/lib/python3.5/site-packages/h2o/model/regression.py /usr/local/lib/python3.5/site-packages/h2o/transforms/__init__.py /usr/local/lib/python3.5/site-packages/h2o/transforms/__pycache__/__init__.cpython-35.pyc /usr/local/lib/python3.5/site-packages/h2o/transforms/__pycache__/decomposition.cpython-35.pyc /usr/local/lib/python3.5/site-packages/h2o/transforms/__pycache__/preprocessing.cpython-35.pyc /usr/local/lib/python3.5/site-packages/h2o/transforms/__pycache__/transform_base.cpython-35.pyc /usr/local/lib/python3.5/site-packages/h2o/transforms/decomposition.py /usr/local/lib/python3.5/site-packages/h2o/transforms/preprocessing.py /usr/local/lib/python3.5/site-packages/h2o/transforms/transform_base.py /usr/local/lib/python3.5/site-packages/h2o/two_dim_table.py /usr/local/lib/python3.5/site-packages/h2o/utils/__init__.py /usr/local/lib/python3.5/site-packages/h2o/utils/__pycache__/__init__.cpython-35.pyc /usr/local/lib/python3.5/site-packages/h2o/utils/__pycache__/shared_utils.cpython-35.pyc /usr/local/lib/python3.5/site-packages/h2o/utils/shared_utils.pyProceed (y/n)? y Successfully uninstalled h2o-3.8.2.6-1user@MacBook-Pro-of-User:~$然后我尝试升级到最新版本：
user@MacBook-Pro-of-User:~$ pip3 install http://h2o-release.s3.amazonaws.com/h2o/rel-turchin/6/Python/h2o-3.8.2.6-py2.py3-none-any.whl然而，我得到了相同的错误消息：
OSError: Version mismatch. H2O is version 3.8.2.99999, but the h2o-python package is version 3.8.2.6. This is a developer build, please contact your developer.如何正确地为Python安装h2o？
回答：
首先再次尝试使用H2O的最新版本：
pip3 uninstall h2opip3 install http://h2o-release.s3.amazonaws.com/h2o/rel-turchin/9/Python/h2o-3.8.2.9-py2.py3-none-any.whl如果您遇到相同的问题，请执行以下操作：
看起来您的机器上已经运行了一个开发版本的H2O（3.8.2.99999）。您需要终止运行该开发版本的H2O集群。您可以通过以下方式之一来做到这一点：
- 导航到H2O Flow的Web GUI（如果您在本地运行，默认情况下将是localhost:54321）。在GUI中，点击“Admin”菜单项，然后点击“Shut Down”。
- 终止运行H2O集群的Java进程。
一旦您终止了现有的H2O集群，然后重新安装h2o模块，并直接从Python启动H2O集群，如下所示：
import h2oh2o.init()在这一点上，由于没有现有的H2O集群在运行，h2o Python模块将为您启动一个（并且由于您是从Python启动的，它不会对版本感到困惑）。
有时候人们会单独下载H2O的jar文件，启动一个H2O集群，然后安装不同版本的R或Python包，这会导致版本不匹配错误。我认为这可能是您问题的起因。通常启动H2O集群就像import h2o; h2o.init()一样简单。
