Added rst file for rdt of distributed module

docs/distributed.rst

@@ -0,0 +1,165 @@
+Big Data
+------------------------------------------------
+
+Distributed Cellpose for larger-than-memory data
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The ``cellpose.contrib.distributed_cellpose`` module is intended to help run cellpose on 3D datasets
+that are too large to fit in system memory. The dataset is divided into overlapping blocks and
+each block is segmented separately. Results are stitched back together into a seamless segmentation
+of the whole dataset.
+
+Built to run on workstations or clusters. Blocks can be run in parallel, in series, or both. 
+Compute resources (GPUs, CPUs, and RAM) can be arbitrarily partitioned for parallel computing.
+Currently workstations  and LSF clusters are supported. SLURM clusters are
+an easy addition - if you need this to run on a SLURM cluster `please post a feature request issue
+to the github repository <https://github.com/MouseLand/cellpose/issues>`_ and tag @GFleishman.
+
+The input data format must be a zarr array. Some functions are provided in the module to help
+convert your data to a zarr array, but not all formats or situations are covered. These are
+good opportunities to submit pull requests. Currently, the module must be run via the Python API,
+but making it available in the GUI is another good PR or feature request.
+
+All user facing functions in the module have verbose docstrings that explain inputs and outputs.
+You can access these docstrings like this:
+
+.. code-block:: python
+
+    from cellpose.contrib.distributed_segmentation import distributed_eval
+    distributed_eval?
+
+Examples
+~~~~~~~~
+
+Run distributed Cellpose on half the resources of a workstation that has 16 cpus, 1 gpu,
+and 128GB system memory:
+
+.. code-block:: python
+
+   from cellpose.contrib.distributed_segmentation import distributed_eval
+
+    # parameterize cellpose however you like
+    model_kwargs = {'gpu':True, 'model_type':'cyto3'}  # can also use 'pretrained_model'
+    eval_kwargs = {'diameter':30,
+                   'z_axis':0,
+                   'channels':[0,0],
+                   'do_3D':True,
+    }
+
+    # define compute resources for local workstation
+    cluster_kwargs = {
+        'n_workers':1,    # if you only have 1 gpu, then 1 worker is the right choice
+        'ncpus':8,
+        'memory_limit':'64GB',
+        'threads_per_worker':1,
+    }
+
+    # run segmentation
+    # outputs:
+    #     segments: zarr array containing labels
+    #     boxes: list of bounding boxes around all labels (very useful for navigating big data)
+    segments, boxes = distributed_eval(
+        input_zarr=large_zarr_array,
+        blocksize=(256, 256, 256),
+        write_path='/where/zarr/array/containing/results/will/be/written.zarr',
+        model_kwargs=model_kwargs,
+        eval_kwargs=eval_kwargs,
+        cluster_kwargs=cluster_kwargs,
+    )
+
+
+Test run a single block before distributing the whole dataset (always a good idea):
+
+.. code-block:: python
+
+    from cellpose.contrib.distributed_segmentation import process_block
+
+    # parameterize cellpose however you like
+    model_kwargs = {'gpu':True, 'model_type':'cyto3'}
+    eval_kwargs = {'diameter':30,
+                   'z_axis':0,
+                   'channels':[0,0],
+                   'do_3D':True,
+    }
+
+    # define a crop as the distributed function would
+    starts = (128, 128, 128)
+    blocksize = (256, 256, 256)
+    overlap = 60
+    crop = tuple(slice(s-overlap, s+b+overlap) for s, b in zip(starts, blocksize))
+
+    # call the segmentation
+    segments, boxes, box_ids = process_block(
+        block_index=(0, 0, 0),  # when test_mode=True this is just a dummy value
+        crop=crop,
+        input_zarr=my_zarr_array,
+        model_kwargs=model_kwargs,
+        eval_kwargs=eval_kwargs,
+        blocksize=blocksize,
+        overlap=overlap,
+        output_zarr=None,
+        test_mode=True,
+    )
+
+
+Convert a single large (but still smaller than system memory) tiff image to a zarr array:
+
+.. code-block:: python
+
+    # Note full image will be loaded in system memory
+    import tifffile
+    from cellpose.contrib.distributed_segmentation import numpy_array_to_zarr
+
+    data_numpy = tifffile.imread('/path/to/image.tiff')
+    data_zarr = numpy_array_to_zarr('/path/to/output.zarr', data_numpy, chunks=(256, 256, 256))
+    del data_numpy  # assumption is data is large, don't keep in memory copy around
+
+
+Wrap a folder of tiff images/tiles into a single zarr array without duplicating any data:
+
+.. code-block:: python
+
+    # Note tiff filenames must indicate the position of each file in the overall tile grid
+    from cellpose.contrib.distributed_segmentation import wrap_folder_of_tiffs
+    reconstructed_virtual_zarr_array = wrap_folder_of_tiffs(
+        filname_pattern='/path/to/folder/of/*.tiff',
+        block_index_pattern=r'_(Z)(\d+)(Y)(\d+)(X)(\d+)',
+    )
+
+
+Run distributed Cellpose on an LSF cluster with 128 GPUs (e.g. Janelia cluster):
+
+.. code-block:: python
+
+    from cellpose.contrib.distributed_segmentation import distributed_eval
+
+    # parameterize cellpose however you like
+    model_kwargs = {'gpu':True, 'model_type':'cyto3'}
+    eval_kwargs = {'diameter':30,
+                   'z_axis':0,
+                   'channels':[0,0],
+                   'do_3D':True,
+    }
+
+    # define LSFCluster parameters
+    cluster_kwargs = {
+        'ncpus':2,                # cpus per worker
+        'min_workers':8,          # cluster adapts number of workers based on number of blocks
+        'max_workers':128,
+        'queue':'gpu_l4',         # flags required to specify a gpu job may differ between clusters
+        'job_extra_directives':['-gpu "num=1"'],
+    }
+
+    # run segmentation
+    # outputs:
+    #     segments: zarr array containing labels
+    #     boxes: list of bounding boxes around all labels (very useful for navigating big data)
+    segments, boxes = distributed_eval(
+        input_zarr=large_zarr_array,
+        blocksize=(256, 256, 256),
+        write_path='/where/zarr/array/containing/results/will/be/written.zarr',
+        model_kwargs=model_kwargs,
+        eval_kwargs=eval_kwargs,
+        cluster_kwargs=cluster_kwargs,
+    )
+

docs/index.rst

@@ -55,6 +55,7 @@ Cellpose: a generalist algorithm for cellular segmentation
    restore
    train
    benchmark
+   distributed
    openvino
    faq