add python worker script, jupyter export

wut-worker.py

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+#!/usr/bin/env python
+# coding: utf-8
+
+# In[ ]:
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+# wut-worker --- Runs on worker nodes
+#
+#
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+# In[ ]:
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+import os
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+# In[ ]:
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+# Cluster
+from __future__ import absolute_import, division, print_function, unicode_literals
+import tensorflow as tf
+import simplejson as json
+
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+# In[ ]:
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+# The script wut-worker launches this python script.
+# It is better to do in the shell script, because the index has to be
+# unique for each hostname.
+#
+# It has a line like:
+# TF_CONFIG='{"cluster": {"worker": ["ml1:2222", "ml2:2222", "ml3:2222", "ml4:2222", "ml5:2222"]}, "task": {"index": 0, "type": "worker"}}' python3 wut-worker.py
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+# In[ ]:
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+#os.environ["TF_CONFIG"] = json.dumps({
+#    "cluster": {
+#        "worker": [ "ml1:2222", "ml2:2222", "ml3:2222", "ml4:2222", "ml5:2222" ]
+#    },
+#   "task": {"type": "worker", "index": 1},
+#   "num_workers": 5
+#})
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