Error with mnist data normalisation using caffe container

[ando2097]

Issue summary

Error when normalising mnist dataset after following instructions from: [NXP tutorial] (https://www.nxp.com/docs/en/application-note/AN12781.pdf)

---

root@6ced916972d5:/opt/caffe# build/tools/compute_image_mean -backend=lmdb examples/mnist/mnist_train_lmdb examples/mnist/
I0731 11:32:20.036314 1153 db_lmdb.cpp:35] Opened lmdb examples/mnist/mnist_train_lmdb
I0731 11:32:20.036592 1153 compute_image_mean.cpp:70] Starting iteration
I0731 11:32:20.041849 1153 compute_image_mean.cpp:95] Processed 10000 files.
I0731 11:32:20.047762 1153 compute_image_mean.cpp:95] Processed 20000 files.
I0731 11:32:20.054062 1153 compute_image_mean.cpp:95] Processed 30000 files.
I0731 11:32:20.060184 1153 compute_image_mean.cpp:95] Processed 40000 files.
I0731 11:32:20.065790 1153 compute_image_mean.cpp:95] Processed 50000 files.
I0731 11:32:20.071755 1153 compute_image_mean.cpp:95] Processed 60000 files.
I0731 11:32:20.071797 1153 compute_image_mean.cpp:108] Write to examples/mnist/
F0731 11:32:20.071946 1153 io.cpp:69] Check failed: proto.SerializeToOstream(&output)
*** Check failure stack trace: ***
@ 0x7f04629a15cd google::LogMessage::Fail()
@ 0x7f04629a3433 google::LogMessage::SendToLog()
@ 0x7f04629a115b google::LogMessage::Flush()
@ 0x7f04629a3e1e google::LogMessageFatal::~LogMessageFatal()
@ 0x7f0462f1b425 caffe::WriteProtoToBinaryFile()
@ 0x403052 main
@ 0x7f04618f3830 __libc_start_main
@ 0x403259 _start
@ (nil) (unknown)
Aborted

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Steps to reproduce

follow instructions through to step 2 of caffe model training
(https://www.nxp.com/docs/en/application-note/AN12781.pdf)

Tried solutions

checking disk space (only 2% used)
checking permissions for examples/mnist/mnist_train_lmdb (had all necessary permissions)

System configuration

• Operating system: Docker Image
• Compiler: gcc version 5.4.0
• CUDA version (if applicable):
• CUDNN version (if applicable):
• BLAS: N/A
• Python version (if using pycaffe):
• MATLAB version (if using matcaffe):

Issue checklist

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• [ *] written a short summary and detailed steps to reproduce
• [* ] explained how solutions to related problems failed (tick if found none)
• [* ] filled system configuration
• [* ] attached relevant logs/config files (tick if not applicable)