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<h1>Source code for airflow.providers.google.cloud.utils.mlengine_operator_utils</h1><div class="highlight"><pre>
<span></span><span class="c1"># Licensed to the Apache Software Foundation (ASF) under one</span>
<span class="c1"># or more contributor license agreements. See the NOTICE file</span>
<span class="c1"># distributed with this work for additional information</span>
<span class="c1"># regarding copyright ownership. The ASF licenses this file</span>
<span class="c1"># to you under the Apache License, Version 2.0 (the</span>
<span class="c1"># &quot;License&quot;); you may not use this file except in compliance</span>
<span class="c1"># with the License. You may obtain a copy of the License at</span>
<span class="c1">#</span>
<span class="c1"># http://www.apache.org/licenses/LICENSE-2.0</span>
<span class="c1">#</span>
<span class="c1"># Unless required by applicable law or agreed to in writing,</span>
<span class="c1"># software distributed under the License is distributed on an</span>
<span class="c1"># &quot;AS IS&quot; BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY</span>
<span class="c1"># KIND, either express or implied. See the License for the</span>
<span class="c1"># specific language governing permissions and limitations</span>
<span class="c1"># under the License.</span>
<span class="c1">#</span>
<span class="sd">&quot;&quot;&quot;This module contains helper functions for MLEngine operators.&quot;&quot;&quot;</span>
<span class="kn">import</span> <span class="nn">base64</span>
<span class="kn">import</span> <span class="nn">json</span>
<span class="kn">import</span> <span class="nn">os</span>
<span class="kn">import</span> <span class="nn">re</span>
<span class="kn">from</span> <span class="nn">typing</span> <span class="kn">import</span> <span class="n">Callable</span><span class="p">,</span> <span class="n">Dict</span><span class="p">,</span> <span class="n">Iterable</span><span class="p">,</span> <span class="n">List</span><span class="p">,</span> <span class="n">Optional</span><span class="p">,</span> <span class="n">Tuple</span><span class="p">,</span> <span class="n">TypeVar</span>
<span class="kn">from</span> <span class="nn">urllib.parse</span> <span class="kn">import</span> <span class="n">urlsplit</span>
<span class="kn">import</span> <span class="nn">dill</span>
<span class="kn">from</span> <span class="nn">airflow</span> <span class="kn">import</span> <span class="n">DAG</span>
<span class="kn">from</span> <span class="nn">airflow.exceptions</span> <span class="kn">import</span> <span class="n">AirflowException</span>
<span class="kn">from</span> <span class="nn">airflow.operators.python</span> <span class="kn">import</span> <span class="n">PythonOperator</span>
<span class="kn">from</span> <span class="nn">airflow.providers.google.cloud.hooks.gcs</span> <span class="kn">import</span> <span class="n">GCSHook</span>
<span class="kn">from</span> <span class="nn">airflow.providers.google.cloud.operators.dataflow</span> <span class="kn">import</span> <span class="n">DataflowCreatePythonJobOperator</span>
<span class="kn">from</span> <span class="nn">airflow.providers.google.cloud.operators.mlengine</span> <span class="kn">import</span> <span class="n">MLEngineStartBatchPredictionJobOperator</span>
<div class="viewcode-block" id="T"><a class="viewcode-back" href="../../../../../../_api/airflow/providers/google/cloud/utils/mlengine_operator_utils/index.html#airflow.providers.google.cloud.utils.mlengine_operator_utils.T">[docs]</a><span class="n">T</span> <span class="o">=</span> <span class="n">TypeVar</span><span class="p">(</span><span class="s2">&quot;T&quot;</span><span class="p">,</span> <span class="n">bound</span><span class="o">=</span><span class="n">Callable</span><span class="p">)</span> <span class="c1"># pylint: disable=invalid-name</span></div>
<div class="viewcode-block" id="create_evaluate_ops"><a class="viewcode-back" href="../../../../../../_api/airflow/providers/google/cloud/utils/mlengine_operator_utils/index.html#airflow.providers.google.cloud.utils.mlengine_operator_utils.create_evaluate_ops">[docs]</a><span class="k">def</span> <span class="nf">create_evaluate_ops</span><span class="p">(</span> <span class="c1"># pylint: disable=too-many-arguments</span>
<span class="n">task_prefix</span><span class="p">:</span> <span class="nb">str</span><span class="p">,</span>
<span class="n">data_format</span><span class="p">:</span> <span class="nb">str</span><span class="p">,</span>
<span class="n">input_paths</span><span class="p">:</span> <span class="n">List</span><span class="p">[</span><span class="nb">str</span><span class="p">],</span>
<span class="n">prediction_path</span><span class="p">:</span> <span class="nb">str</span><span class="p">,</span>
<span class="n">metric_fn_and_keys</span><span class="p">:</span> <span class="n">Tuple</span><span class="p">[</span><span class="n">T</span><span class="p">,</span> <span class="n">Iterable</span><span class="p">[</span><span class="nb">str</span><span class="p">]],</span>
<span class="n">validate_fn</span><span class="p">:</span> <span class="n">T</span><span class="p">,</span>
<span class="n">batch_prediction_job_id</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="nb">str</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
<span class="n">region</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="nb">str</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
<span class="n">project_id</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="nb">str</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
<span class="n">dataflow_options</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="n">Dict</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
<span class="n">model_uri</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="nb">str</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
<span class="n">model_name</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="nb">str</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
<span class="n">version_name</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="nb">str</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
<span class="n">dag</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="n">DAG</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
<span class="n">py_interpreter</span><span class="o">=</span><span class="s2">&quot;python3&quot;</span><span class="p">,</span>
<span class="p">):</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Creates Operators needed for model evaluation and returns.</span>
<span class="sd"> It gets prediction over inputs via Cloud ML Engine BatchPrediction API by</span>
<span class="sd"> calling MLEngineBatchPredictionOperator, then summarize and validate</span>
<span class="sd"> the result via Cloud Dataflow using DataFlowPythonOperator.</span>
<span class="sd"> For details and pricing about Batch prediction, please refer to the website</span>
<span class="sd"> https://cloud.google.com/ml-engine/docs/how-tos/batch-predict</span>
<span class="sd"> and for Cloud Dataflow, https://cloud.google.com/dataflow/docs/</span>
<span class="sd"> It returns three chained operators for prediction, summary, and validation,</span>
<span class="sd"> named as ``&lt;prefix&gt;-prediction``, ``&lt;prefix&gt;-summary``, and ``&lt;prefix&gt;-validation``,</span>
<span class="sd"> respectively.</span>
<span class="sd"> (``&lt;prefix&gt;`` should contain only alphanumeric characters or hyphen.)</span>
<span class="sd"> The upstream and downstream can be set accordingly like:</span>
<span class="sd"> .. code-block:: python</span>
<span class="sd"> pred, _, val = create_evaluate_ops(...)</span>
<span class="sd"> pred.set_upstream(upstream_op)</span>
<span class="sd"> ...</span>
<span class="sd"> downstream_op.set_upstream(val)</span>
<span class="sd"> Callers will provide two python callables, metric_fn and validate_fn, in</span>
<span class="sd"> order to customize the evaluation behavior as they wish.</span>
<span class="sd"> - metric_fn receives a dictionary per instance derived from json in the</span>
<span class="sd"> batch prediction result. The keys might vary depending on the model.</span>
<span class="sd"> It should return a tuple of metrics.</span>
<span class="sd"> - validation_fn receives a dictionary of the averaged metrics that metric_fn</span>
<span class="sd"> generated over all instances.</span>
<span class="sd"> The key/value of the dictionary matches to what&#39;s given by</span>
<span class="sd"> metric_fn_and_keys arg.</span>
<span class="sd"> The dictionary contains an additional metric, &#39;count&#39; to represent the</span>
<span class="sd"> total number of instances received for evaluation.</span>
<span class="sd"> The function would raise an exception to mark the task as failed, in a</span>
<span class="sd"> case the validation result is not okay to proceed (i.e. to set the trained</span>
<span class="sd"> version as default).</span>
<span class="sd"> Typical examples are like this:</span>
<span class="sd"> .. code-block:: python</span>
<span class="sd"> def get_metric_fn_and_keys():</span>
<span class="sd"> import math # imports should be outside of the metric_fn below.</span>
<span class="sd"> def error_and_squared_error(inst):</span>
<span class="sd"> label = float(inst[&#39;input_label&#39;])</span>
<span class="sd"> classes = float(inst[&#39;classes&#39;]) # 0 or 1</span>
<span class="sd"> err = abs(classes-label)</span>
<span class="sd"> squared_err = math.pow(classes-label, 2)</span>
<span class="sd"> return (err, squared_err) # returns a tuple.</span>
<span class="sd"> return error_and_squared_error, [&#39;err&#39;, &#39;mse&#39;] # key order must match.</span>
<span class="sd"> def validate_err_and_count(summary):</span>
<span class="sd"> if summary[&#39;err&#39;] &gt; 0.2:</span>
<span class="sd"> raise ValueError(&#39;Too high err&gt;0.2; summary=%s&#39; % summary)</span>
<span class="sd"> if summary[&#39;mse&#39;] &gt; 0.05:</span>
<span class="sd"> raise ValueError(&#39;Too high mse&gt;0.05; summary=%s&#39; % summary)</span>
<span class="sd"> if summary[&#39;count&#39;] &lt; 1000:</span>
<span class="sd"> raise ValueError(&#39;Too few instances&lt;1000; summary=%s&#39; % summary)</span>
<span class="sd"> return summary</span>
<span class="sd"> For the details on the other BatchPrediction-related arguments (project_id,</span>
<span class="sd"> job_id, region, data_format, input_paths, prediction_path, model_uri),</span>
<span class="sd"> please refer to MLEngineBatchPredictionOperator too.</span>
<span class="sd"> :param task_prefix: a prefix for the tasks. Only alphanumeric characters and</span>
<span class="sd"> hyphen are allowed (no underscores), since this will be used as dataflow</span>
<span class="sd"> job name, which doesn&#39;t allow other characters.</span>
<span class="sd"> :type task_prefix: str</span>
<span class="sd"> :param data_format: either of &#39;TEXT&#39;, &#39;TF_RECORD&#39;, &#39;TF_RECORD_GZIP&#39;</span>
<span class="sd"> :type data_format: str</span>
<span class="sd"> :param input_paths: a list of input paths to be sent to BatchPrediction.</span>
<span class="sd"> :type input_paths: list[str]</span>
<span class="sd"> :param prediction_path: GCS path to put the prediction results in.</span>
<span class="sd"> :type prediction_path: str</span>
<span class="sd"> :param metric_fn_and_keys: a tuple of metric_fn and metric_keys:</span>
<span class="sd"> - metric_fn is a function that accepts a dictionary (for an instance),</span>
<span class="sd"> and returns a tuple of metric(s) that it calculates.</span>
<span class="sd"> - metric_keys is a list of strings to denote the key of each metric.</span>
<span class="sd"> :type metric_fn_and_keys: tuple of a function and a list[str]</span>
<span class="sd"> :param validate_fn: a function to validate whether the averaged metric(s) is</span>
<span class="sd"> good enough to push the model.</span>
<span class="sd"> :type validate_fn: function</span>
<span class="sd"> :param batch_prediction_job_id: the id to use for the Cloud ML Batch</span>
<span class="sd"> prediction job. Passed directly to the MLEngineBatchPredictionOperator as</span>
<span class="sd"> the job_id argument.</span>
<span class="sd"> :type batch_prediction_job_id: str</span>
<span class="sd"> :param project_id: the Google Cloud project id in which to execute</span>
<span class="sd"> Cloud ML Batch Prediction and Dataflow jobs. If None, then the `dag`&#39;s</span>
<span class="sd"> `default_args[&#39;project_id&#39;]` will be used.</span>
<span class="sd"> :type project_id: str</span>
<span class="sd"> :param region: the Google Cloud region in which to execute Cloud ML</span>
<span class="sd"> Batch Prediction and Dataflow jobs. If None, then the `dag`&#39;s</span>
<span class="sd"> `default_args[&#39;region&#39;]` will be used.</span>
<span class="sd"> :type region: str</span>
<span class="sd"> :param dataflow_options: options to run Dataflow jobs. If None, then the</span>
<span class="sd"> `dag`&#39;s `default_args[&#39;dataflow_default_options&#39;]` will be used.</span>
<span class="sd"> :type dataflow_options: dictionary</span>
<span class="sd"> :param model_uri: GCS path of the model exported by Tensorflow using</span>
<span class="sd"> ``tensorflow.estimator.export_savedmodel()``. It cannot be used with</span>
<span class="sd"> model_name or version_name below. See MLEngineBatchPredictionOperator for</span>
<span class="sd"> more detail.</span>
<span class="sd"> :type model_uri: str</span>
<span class="sd"> :param model_name: Used to indicate a model to use for prediction. Can be</span>
<span class="sd"> used in combination with version_name, but cannot be used together with</span>
<span class="sd"> model_uri. See MLEngineBatchPredictionOperator for more detail. If None,</span>
<span class="sd"> then the `dag`&#39;s `default_args[&#39;model_name&#39;]` will be used.</span>
<span class="sd"> :type model_name: str</span>
<span class="sd"> :param version_name: Used to indicate a model version to use for prediction,</span>
<span class="sd"> in combination with model_name. Cannot be used together with model_uri.</span>
<span class="sd"> See MLEngineBatchPredictionOperator for more detail. If None, then the</span>
<span class="sd"> `dag`&#39;s `default_args[&#39;version_name&#39;]` will be used.</span>
<span class="sd"> :type version_name: str</span>
<span class="sd"> :param dag: The `DAG` to use for all Operators.</span>
<span class="sd"> :type dag: airflow.models.DAG</span>
<span class="sd"> :param py_interpreter: Python version of the beam pipeline.</span>
<span class="sd"> If None, this defaults to the python3.</span>
<span class="sd"> To track python versions supported by beam and related</span>
<span class="sd"> issues check: https://issues.apache.org/jira/browse/BEAM-1251</span>
<span class="sd"> :type py_interpreter: str</span>
<span class="sd"> :returns: a tuple of three operators, (prediction, summary, validation)</span>
<span class="sd"> :rtype: tuple(DataFlowPythonOperator, DataFlowPythonOperator,</span>
<span class="sd"> PythonOperator)</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="n">batch_prediction_job_id</span> <span class="o">=</span> <span class="n">batch_prediction_job_id</span> <span class="ow">or</span> <span class="s2">&quot;&quot;</span>
<span class="n">dataflow_options</span> <span class="o">=</span> <span class="n">dataflow_options</span> <span class="ow">or</span> <span class="p">{}</span>
<span class="n">region</span> <span class="o">=</span> <span class="n">region</span> <span class="ow">or</span> <span class="s2">&quot;&quot;</span>
<span class="c1"># Verify that task_prefix doesn&#39;t have any special characters except hyphen</span>
<span class="c1"># &#39;-&#39;, which is the only allowed non-alphanumeric character by Dataflow.</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">re</span><span class="o">.</span><span class="n">match</span><span class="p">(</span><span class="sa">r</span><span class="s2">&quot;^[a-zA-Z][-A-Za-z0-9]*$&quot;</span><span class="p">,</span> <span class="n">task_prefix</span><span class="p">):</span>
<span class="k">raise</span> <span class="n">AirflowException</span><span class="p">(</span>
<span class="s2">&quot;Malformed task_id for DataFlowPythonOperator (only alphanumeric &quot;</span>
<span class="s2">&quot;and hyphens are allowed but got: &quot;</span> <span class="o">+</span> <span class="n">task_prefix</span>
<span class="p">)</span>
<span class="n">metric_fn</span><span class="p">,</span> <span class="n">metric_keys</span> <span class="o">=</span> <span class="n">metric_fn_and_keys</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">callable</span><span class="p">(</span><span class="n">metric_fn</span><span class="p">):</span>
<span class="k">raise</span> <span class="n">AirflowException</span><span class="p">(</span><span class="s2">&quot;`metric_fn` param must be callable.&quot;</span><span class="p">)</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">callable</span><span class="p">(</span><span class="n">validate_fn</span><span class="p">):</span>
<span class="k">raise</span> <span class="n">AirflowException</span><span class="p">(</span><span class="s2">&quot;`validate_fn` param must be callable.&quot;</span><span class="p">)</span>
<span class="k">if</span> <span class="n">dag</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span> <span class="ow">and</span> <span class="n">dag</span><span class="o">.</span><span class="n">default_args</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
<span class="n">default_args</span> <span class="o">=</span> <span class="n">dag</span><span class="o">.</span><span class="n">default_args</span>
<span class="n">project_id</span> <span class="o">=</span> <span class="n">project_id</span> <span class="ow">or</span> <span class="n">default_args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">&#39;project_id&#39;</span><span class="p">)</span>
<span class="n">region</span> <span class="o">=</span> <span class="n">region</span> <span class="ow">or</span> <span class="n">default_args</span><span class="p">[</span><span class="s1">&#39;region&#39;</span><span class="p">]</span>
<span class="n">model_name</span> <span class="o">=</span> <span class="n">model_name</span> <span class="ow">or</span> <span class="n">default_args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">&#39;model_name&#39;</span><span class="p">)</span>
<span class="n">version_name</span> <span class="o">=</span> <span class="n">version_name</span> <span class="ow">or</span> <span class="n">default_args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">&#39;version_name&#39;</span><span class="p">)</span>
<span class="n">dataflow_options</span> <span class="o">=</span> <span class="n">dataflow_options</span> <span class="ow">or</span> <span class="n">default_args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">&#39;dataflow_default_options&#39;</span><span class="p">)</span>
<span class="n">evaluate_prediction</span> <span class="o">=</span> <span class="n">MLEngineStartBatchPredictionJobOperator</span><span class="p">(</span>
<span class="n">task_id</span><span class="o">=</span><span class="p">(</span><span class="n">task_prefix</span> <span class="o">+</span> <span class="s2">&quot;-prediction&quot;</span><span class="p">),</span>
<span class="n">project_id</span><span class="o">=</span><span class="n">project_id</span><span class="p">,</span>
<span class="n">job_id</span><span class="o">=</span><span class="n">batch_prediction_job_id</span><span class="p">,</span>
<span class="n">region</span><span class="o">=</span><span class="n">region</span><span class="p">,</span>
<span class="n">data_format</span><span class="o">=</span><span class="n">data_format</span><span class="p">,</span>
<span class="n">input_paths</span><span class="o">=</span><span class="n">input_paths</span><span class="p">,</span>
<span class="n">output_path</span><span class="o">=</span><span class="n">prediction_path</span><span class="p">,</span>
<span class="n">uri</span><span class="o">=</span><span class="n">model_uri</span><span class="p">,</span>
<span class="n">model_name</span><span class="o">=</span><span class="n">model_name</span><span class="p">,</span>
<span class="n">version_name</span><span class="o">=</span><span class="n">version_name</span><span class="p">,</span>
<span class="n">dag</span><span class="o">=</span><span class="n">dag</span><span class="p">,</span>
<span class="p">)</span>
<span class="n">metric_fn_encoded</span> <span class="o">=</span> <span class="n">base64</span><span class="o">.</span><span class="n">b64encode</span><span class="p">(</span><span class="n">dill</span><span class="o">.</span><span class="n">dumps</span><span class="p">(</span><span class="n">metric_fn</span><span class="p">,</span> <span class="n">recurse</span><span class="o">=</span><span class="kc">True</span><span class="p">))</span><span class="o">.</span><span class="n">decode</span><span class="p">()</span>
<span class="n">evaluate_summary</span> <span class="o">=</span> <span class="n">DataflowCreatePythonJobOperator</span><span class="p">(</span>
<span class="n">task_id</span><span class="o">=</span><span class="p">(</span><span class="n">task_prefix</span> <span class="o">+</span> <span class="s2">&quot;-summary&quot;</span><span class="p">),</span>
<span class="n">py_file</span><span class="o">=</span><span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">dirname</span><span class="p">(</span><span class="vm">__file__</span><span class="p">),</span> <span class="s1">&#39;mlengine_prediction_summary.py&#39;</span><span class="p">),</span>
<span class="n">dataflow_default_options</span><span class="o">=</span><span class="n">dataflow_options</span><span class="p">,</span>
<span class="n">options</span><span class="o">=</span><span class="p">{</span>
<span class="s2">&quot;prediction_path&quot;</span><span class="p">:</span> <span class="n">prediction_path</span><span class="p">,</span>
<span class="s2">&quot;metric_fn_encoded&quot;</span><span class="p">:</span> <span class="n">metric_fn_encoded</span><span class="p">,</span>
<span class="s2">&quot;metric_keys&quot;</span><span class="p">:</span> <span class="s1">&#39;,&#39;</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">metric_keys</span><span class="p">),</span>
<span class="p">},</span>
<span class="n">py_interpreter</span><span class="o">=</span><span class="n">py_interpreter</span><span class="p">,</span>
<span class="n">py_requirements</span><span class="o">=</span><span class="p">[</span><span class="s1">&#39;apache-beam[gcp]&gt;=2.14.0&#39;</span><span class="p">],</span>
<span class="n">dag</span><span class="o">=</span><span class="n">dag</span><span class="p">,</span>
<span class="p">)</span>
<span class="n">evaluate_summary</span><span class="o">.</span><span class="n">set_upstream</span><span class="p">(</span><span class="n">evaluate_prediction</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">apply_validate_fn</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="n">templates_dict</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="n">prediction_path</span> <span class="o">=</span> <span class="n">templates_dict</span><span class="p">[</span><span class="s2">&quot;prediction_path&quot;</span><span class="p">]</span>
<span class="n">scheme</span><span class="p">,</span> <span class="n">bucket</span><span class="p">,</span> <span class="n">obj</span><span class="p">,</span> <span class="n">_</span><span class="p">,</span> <span class="n">_</span> <span class="o">=</span> <span class="n">urlsplit</span><span class="p">(</span><span class="n">prediction_path</span><span class="p">)</span>
<span class="k">if</span> <span class="n">scheme</span> <span class="o">!=</span> <span class="s2">&quot;gs&quot;</span> <span class="ow">or</span> <span class="ow">not</span> <span class="n">bucket</span> <span class="ow">or</span> <span class="ow">not</span> <span class="n">obj</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="sa">f</span><span class="s2">&quot;Wrong format prediction_path: </span><span class="si">{</span><span class="n">prediction_path</span><span class="si">}</span><span class="s2">&quot;</span><span class="p">)</span>
<span class="n">summary</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">obj</span><span class="o">.</span><span class="n">strip</span><span class="p">(</span><span class="s2">&quot;/&quot;</span><span class="p">),</span> <span class="s2">&quot;prediction.summary.json&quot;</span><span class="p">)</span>
<span class="n">gcs_hook</span> <span class="o">=</span> <span class="n">GCSHook</span><span class="p">()</span>
<span class="n">summary</span> <span class="o">=</span> <span class="n">json</span><span class="o">.</span><span class="n">loads</span><span class="p">(</span><span class="n">gcs_hook</span><span class="o">.</span><span class="n">download</span><span class="p">(</span><span class="n">bucket</span><span class="p">,</span> <span class="n">summary</span><span class="p">))</span>
<span class="k">return</span> <span class="n">validate_fn</span><span class="p">(</span><span class="n">summary</span><span class="p">)</span>
<span class="n">evaluate_validation</span> <span class="o">=</span> <span class="n">PythonOperator</span><span class="p">(</span>
<span class="n">task_id</span><span class="o">=</span><span class="p">(</span><span class="n">task_prefix</span> <span class="o">+</span> <span class="s2">&quot;-validation&quot;</span><span class="p">),</span>
<span class="n">python_callable</span><span class="o">=</span><span class="n">apply_validate_fn</span><span class="p">,</span>
<span class="n">templates_dict</span><span class="o">=</span><span class="p">{</span><span class="s2">&quot;prediction_path&quot;</span><span class="p">:</span> <span class="n">prediction_path</span><span class="p">},</span>
<span class="n">dag</span><span class="o">=</span><span class="n">dag</span><span class="p">,</span>
<span class="p">)</span>
<span class="n">evaluate_validation</span><span class="o">.</span><span class="n">set_upstream</span><span class="p">(</span><span class="n">evaluate_summary</span><span class="p">)</span>
<span class="k">return</span> <span class="n">evaluate_prediction</span><span class="p">,</span> <span class="n">evaluate_summary</span><span class="p">,</span> <span class="n">evaluate_validation</span></div>
</pre></div>
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