message: Pin estimator nightly to the latest 2.1 version
diff: @@ -147,7 +147,7 @@ function install_pip_deps {
  ${SUDO_CMD} ${PIP_CMD} install scikit-learn==0.20.3
  ${SUDO_CMD} ${PIP_CMD} install --upgrade tb-nightly
  ${PIP_CMD} install --user --upgrade attrs
  - ${PIP_CMD} install --user --upgrade tf-estimator-nightly
  + ${PIP_CMD} install --user --upgrade tf-estimator-nightly==2.1.0.dev2020031101
  ${PIP_CMD} install --user --upgrade "future>=0.17.1"
  # ===================================================================
  }
  @@ -181,7 +181,7 @@ function install_ubuntu_16_pip_deps {
  "${PIP_CMD}" install portpicker --user
  "${PIP_CMD}" install scipy --user
  "${PIP_CMD}" install scikit-learn --user
  - "${PIP_CMD}" install --user --upgrade tf-estimator-nightly
  + "${PIP_CMD}" install --user --upgrade tf-estimator-nightly==2.1.0.dev2020031101
  "${PIP_CMD}" install --user --upgrade tb-nightly
  # ===================================================================
  }
  @@ -224,7 +224,7 @@ function install_macos_pip_deps {
  ${SUDO_CMD} ${PIP_CMD} install --upgrade grpcio
  ${SUDO_CMD} ${PIP_CMD} install --upgrade tb-nightly
  ${PIP_CMD} install --user --upgrade attrs
  - ${PIP_CMD} install --user --upgrade tf-estimator-nightly
  + ${PIP_CMD} install --user --upgrade tf-estimator-nightly==2.1.0.dev2020031101
  ${PIP_CMD} install --user --upgrade "future>=0.17.1"
  }
  