I am trying to install tensorflow on ubuntu from: https://www.tensorflow.org/get_started/os_setup#virtualenv_installation
But when I get to the step:
pip install --upgrade $ TF_BINARY_URL
You must give at least one requirement to install (see "pip help install").
That's because the environment variable
$TF_BINARY_URL is not set. you must export it first, like described in the docs you provided.
# Ubuntu/Linux 64-bit, CPU only, Python 2.7 (tensorflow)$ export TF_BINARY_URL=https://storage.googleapis.com/tensorflow/linux/cpu/tensorflow-0.12.1-cp27-none-linux_x86_64.whl
(or any other url specific to arch/platform)