pytorch build notes

docs/README-pytorch.md

@@ -1,11 +1,68 @@
-# No Anaconda
-Anaconda is a package manager for Python.
-The Anaconda repository contains non-free software,
-so don't use it.
-
 # PyTorch
 PyTorch is an alternative to TensorFlow.
 
-## PyTorch Installation
-Build from scratch without non-free options.
+## Build Py
+Build from scratch with free software options.
+PyTorch has a `CMakeLists.txt`, so lets see how it goes with a `cmake` build....
+
+Install build dependencies:
+```
+apt install cmake
+mkdir build
+cd build
+cmake ..
+ccmake ..
+```
+
+Notable build options:
+
+```
+BLAS --- has multiple options:
+         MKL (non-free bits possible)
+         vecLib (?)
+         FLAME (?)
+         Eigen (in Debian)
+         ATLAS (in Debian?)
+         OpenBLAS (in Debian)
+         
+BUILD_BINARY ON
+BUILD_PYTHON ON
+OPENMP_FOUND ON
+USE_CUDA OFF
+USE_CUDNN OFF
+USE_DISTRIBUTED ON
+USE_FFMPEG ON
+USE_MKLDNN ON  ?? with Debian's packages ?
+USE_MKLDNN_CBLAS NO ?
+USE_LEVELDB ?? Available in debian.
+USE_LMDB ?? Available in Debian.
+USE_MPI ON heh
+USE_NCCL OFF  nvidia
+USE_NUMA ON  ?
+USE_NUMPY ON
+USE_OBSERVERS ON ?
+USE_OPENCL ON ?
+USE_OPENCV ON ?
+USE_OPENMP ON ?
+USE_REDIS ?
+USE_ROCKSDB Available in Debian, like leveldb and lmdb
+USE_ZMQ Available in Debian, messaging.
+USE_ZSTD Available in Debian, compression.
+WITH_BLAS ?
+WITH_OPENMP ON
+CAFFE2_USE_MSVC_STATIC_RUNTIME OFF ??
+```
+
+
+# Proprietary Bits
+Parts to avoid in the PyTorch ecosystem:
+
+* Anaconda is a package manager for Python.The Anaconda repository contains non-free software,
+so don't use it.
+
+* "MKL" (Intel's non-free binaries).
+
+* Note, these MKL packages are in Debian: `libmkldnn0 libmkldnn-dev libmkldnn-doc`
+
+* Intel compiler.