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Problem statement

Commands such as %run ./some_notebook refer to a notebook path that can be relative to the currently executing notebook.
Depending on where from the above command is invoked, the notebook path for the same notebook could vary significantly.
We need to support this variation of notebook paths when building the dependency graph

Proposed Solution

The DependencyGraph already accepts a locator function.
The locator used for unit testing only deals with local samples in the same folder.
This production locator should be context aware and convert relative paths to full paths, such that we only traverse notebooks once.

Additional Context

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