Could not find a version that satisfies the requirement tensorflow-estimator==1.15.1 (from tensorflow) (from versions: none)

This error message indicates that the version of `tensorflow-estimator` you are trying to install is not available.

`tensorflow-estimator` version 1.15.1 is compatible with TensorFlow version 1.15. You can try installing a different version of `tensorflow-estimator` that is compatible with your version of TensorFlow.

For example, if you are using TensorFlow 2.x, you can install the latest version of `tensorflow-estimator` using the following command:

pip install tensorflow-estimator

This will install the latest version of `tensorflow-estimator` that is compatible with TensorFlow 2.x. If you are using a different version of TensorFlow, you can install the appropriate version of `tensorflow-estimator` by specifying the version number:

pip install tensorflow-estimator==1.15.0

This will install `tensorflow-estimator` version 1.15.0, which is compatible with TensorFlow 1.15.