我一直在试图找到一种方法,将经过培训的PySpark管道部署为API,最终我将Flask和PMML作为可能的解决方案
据我所知,PMML文件的生成正在工作:我使用ParamGridBuilder训练管道,获得最佳模型,并将其作为.PMML文件输出
但是,当我将结果文件加载到Flask中时,出现了一个问题。我能够让API正常运行;然而,当我向它发送请求时,我并没有得到预期的结果(文本中包含的情绪),而是出现了以下错误
[2020-03-02 17:05:15,831] ERROR in app: Exception on /sentiment_analysis [GET]
Traceback (most recent call last):
File "/home/users/anaconda3/lib/python3.6/site-packages/flask/app.py", line 2446, in wsgi_app
response = self.full_dispatch_request()
File "/home/users/anaconda3/lib/python3.6/site-packages/flask/app.py", line 1951, in full_dispatch_request
rv = self.handle_user_exception(e)
File "/home/users/anaconda3/lib/python3.6/site-packages/flask/app.py", line 1820, in handle_user_exception
reraise(exc_type, exc_value, tb)
File "/home/users/anaconda3/lib/python3.6/site-packages/flask/_compat.py", line 39, in reraise
raise value
File "/home/users/anaconda3/lib/python3.6/site-packages/flask/app.py", line 1949, in full_dispatch_request
rv = self.dispatch_request()
File "/home/users/anaconda3/lib/python3.6/site-packages/flask/app.py", line 1935, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "/home/users/sentiment_analysis.py", line 59, in hello_world
resultado = evaluator.evaluate(df)
File "/home/users/.local/lib/python3.6/site-packages/jpmml_evaluator/__init__.py", line 80, in evaluate
javaArguments = self.backend.dict2map(arguments)
File "/home/users/.local/lib/python3.6/site-packages/jpmml_evaluator/pyjnius.py", line 31, in dict2map
raise ValueError()
ValueError
127.0.0.1 - - [02/Mar/2020 17:05:15] "GET /sentiment_analysis?text=test HTTP/1.1" 500 -
以下是相关软件和软件包的版本:
另外,下面是我用来将模型加载到Flask中的Python代码
from flask import Flask, request
import pandas as pd
from jpmml_evaluator import make_evaluator, pyjnius
app = Flask('sentiment_analysis')
@app.route("/sentiment_analysis")
def hello_world():
text = request.args.get('text')
pyjnius.jnius_configure_classpath()
backend = pyjnius.PyJNIusBackend()
evaluator = make_evaluator(backend, "test.pmml") \
.verify()
df = pd.DataFrame(columns=["TWEET"], data=[[text]])
result = evaluator.evaluate(df)
sentiment = result.collect()[0]['prediction']
if int(sentiment) == 0:
sentiment = 'negative'
else:
sentiment = 'positive'
return 'The sentiment is: ' + sentiment, 200
app.run(host='0.0.0.0', port=5001)
有人知道这里出了什么问题吗
您的参数
DataFrame
包含复杂的列类型;您选择的Java后端(PyJNIus)不知道如何将此Python值映射到Java值如果你想继续以你自己的方式继续下去,你可以尝试的事情:
jpmml_evaluator
包更新为最新版本。0.2.3之后增加了新的价值转换。更新的软件包版本应该确切地告诉您有问题的列类型是什么。请参阅^{综合考虑,您最好使用OpenRESTWeb服务为您的PySpark模型提供服务。有一个关于deploying Apache Spark ML pipeline models as a REST web service的最新教程
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