wehub-resource-sync
620 lines
14 KiB
Python
620 lines
14 KiB
Python
"""Tensorflow backend implementation"""
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from __future__ import absolute_import
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import builtins
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import numbers
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import numpy as np
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import tensorflow as tf
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from ... import ndarray as nd
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from ...function.base import TargetCode
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from ...utils import version
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if version.parse(tf.__version__) < version.parse("2.3.0"):
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raise RuntimeError(
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"DGL requires TensorFlow>=2.3.0 for the official DLPack support."
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)
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def zerocopy_to_dlpack(data):
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return tf.experimental.dlpack.to_dlpack(data)
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def zerocopy_from_dlpack(dlpack_tensor):
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# TODO(Jinjing): Tensorflow requires memory to be 64-bytes aligned. We check the
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# alignment and make a copy if needed. The functionality is better in TF's main repo.
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aligned = nd.from_dlpack(dlpack_tensor).to_dlpack(64)
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return tf.experimental.dlpack.from_dlpack(aligned)
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def data_type_dict():
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return {
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"bfloat16": tf.bfloat16,
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"float16": tf.float16,
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"float32": tf.float32,
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"float64": tf.float64,
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"uint8": tf.uint8,
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"int8": tf.int8,
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"int16": tf.int16,
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"int32": tf.int32,
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"int64": tf.int64,
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"bool": tf.bool,
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}
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def cpu():
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return "/cpu:0"
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def tensor(data, dtype=None):
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if isinstance(data, tf.Tensor):
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if dtype is None or data.dtype == dtype:
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return data
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else:
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return tf.cast(data, dtype=dtype)
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else:
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if isinstance(data, numbers.Number):
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data = [data]
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return tf.convert_to_tensor(data, dtype=dtype)
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def initialize_context():
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tf.zeros(1)
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def as_scalar(data):
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data = data.numpy()
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return data if np.isscalar(data) else data.item()
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def get_preferred_sparse_format():
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"""Get the preferred sparse matrix format supported by the backend.
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Different backends have their preferred backend. This info is useful when
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constructing a sparse matrix.
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"""
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return "coo"
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def sparse_matrix(data, index, shape, force_format=False):
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fmt = index[0]
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if fmt != "coo":
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raise TypeError(
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"Tensorflow backend only supports COO format. But got %s." % fmt
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)
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# tf.SparseTensor only supports int64 indexing,
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# therefore manually casting to int64 when input in int32
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spmat = tf.SparseTensor(
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indices=tf.cast(tf.transpose(index[1], (1, 0)), tf.int64),
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values=data,
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dense_shape=shape,
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)
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return spmat, None
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def sparse_matrix_indices(spmat):
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return ("coo", spmat.indices)
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def is_tensor(obj):
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return isinstance(obj, tf.Tensor)
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def shape(input):
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return input.shape
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def dtype(input):
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return input.dtype
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def ndim(input):
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return input.ndim
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def context(input):
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spec = tf.DeviceSpec.from_string(input.device)
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return "/{}:{}".format(spec.device_type.lower(), spec.device_index)
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def device_type(ctx):
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return tf.DeviceSpec.from_string(ctx).device_type.lower()
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def device_id(ctx):
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return tf.DeviceSpec.from_string(ctx).device_index
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def to_backend_ctx(dglctx):
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dev_type = dglctx.device_type
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if dev_type == 1:
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return "/cpu:0"
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elif dev_type == 2:
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return "/gpu:%d" % (dglctx.device_id)
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else:
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raise ValueError("Unsupported DGL device context:", dglctx)
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def astype(input, ty):
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with tf.device(input.device):
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return tf.cast(input, dtype=ty)
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def asnumpy(input):
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if isinstance(input, tf.SparseTensor):
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# tf.sparse.to_dense assume sorted indices, need to turn off validate_indices in our cases
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return tf.sparse.to_dense(input, validate_indices=False).numpy()
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else:
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return input.numpy()
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def copy_to(input, ctx, **kwargs):
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with tf.device(ctx):
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new_tensor = tf.identity(input)
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return new_tensor
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def is_pinned(input):
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return False # not sure how to do this
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def sum(input, dim, keepdims=False):
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if input.dtype == tf.bool:
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input = tf.cast(input, tf.int32)
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return tf.reduce_sum(input, axis=dim, keepdims=keepdims)
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def floor_div(in1, in2):
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return astype(in1 / in2, dtype(in1))
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def reduce_sum(input):
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if input.dtype == tf.bool:
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input = tf.cast(input, tf.int32)
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return tf.reduce_sum(input)
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def cumsum(input, dim):
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if input.dtype == tf.bool:
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input = tf.cast(input, tf.int32)
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return tf.cumsum(input, axis=dim)
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def mean(input, dim):
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return tf.reduce_mean(input, axis=dim)
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def reduce_mean(input):
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return tf.reduce_mean(input)
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def max(input, dim):
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return tf.reduce_max(input, axis=dim)
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def reduce_max(input):
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return tf.reduce_max(input)
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def min(input, dim):
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return tf.reduce_min(input, axis=dim)
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def reduce_min(input):
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return tf.reduce_min(input)
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def argsort(input, dim, descending):
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if descending:
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return tf.cast(
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tf.argsort(input, axis=dim, direction="DESCENDING"), dtype=tf.int64
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)
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else:
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return tf.cast(
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tf.argsort(input, axis=dim, direction="ASCENDING"), dtype=tf.int64
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)
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def topk(input, k, dim, descending=True):
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if not descending:
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input = -input
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shape = np.arange(input.ndim)
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shape[dim], shape[-1] = shape[-1], shape[dim]
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out1 = tf.transpose(input, perm=shape)
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out2 = tf.math.top_k(out1, k=k, sorted=True)
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out = tf.transpose(out2[0], shape)
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if not descending:
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out = -out
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return out
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def argtopk(input, k, dim, descending=True):
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if not descending:
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input = -input
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shape = np.arange(input.ndim)
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shape[dim], shape[-1] = shape[-1], shape[dim]
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out1 = tf.transpose(input, perm=shape)
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out2 = tf.math.top_k(out1, k=k, sorted=True)
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out = tf.transpose(out2[1], shape)
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if not descending:
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out = -out
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return out
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def exp(input):
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return tf.exp(input)
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def inverse(input):
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return tf.linalg.inv(input)
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def sqrt(input):
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return tf.sqrt(input)
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def softmax(input, dim=-1):
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return tf.math.softmax(input, axis=dim)
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def cat(seq, dim):
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return tf.concat(seq, axis=dim)
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def stack(seq, dim):
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return tf.stack(seq, axis=dim)
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def split(input, sizes_or_sections, dim):
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return [
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copy_to(_, input.device)
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for _ in tf.split(input, sizes_or_sections, axis=dim)
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]
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def repeat(input, repeats, dim):
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return tf.repeat(input, repeats, dim)
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def gather_row(data, row_index):
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return tf.gather(data, row_index)
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def slice_axis(data, axis, begin, end):
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# assert axis == 0
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# tf doesn't behave well with negative
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s = [slice(None) for i in range(data.ndim)]
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if end == 0:
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end = data.shape[axis]
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s[axis] = slice(begin, end, None)
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return data[tuple(s)]
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def take(data, indices, dim):
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return tf.gather_nd(data, indices, dim)
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def narrow_row(x, start, stop):
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return x[start:stop]
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def scatter_row(data, row_index, value):
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row_index = tf.expand_dims(row_index, 1)
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# XXX(minjie): Normally, the copy_to here is unnecessary. However, TF has this
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# notorious legacy issue that int32 type data is always on CPU, which will
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# crash the program since DGL requires feature data to be on the same device
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# as graph structure.
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return copy_to(
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tf.tensor_scatter_nd_update(data, row_index, value), data.device
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)
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def index_add_inplace(data, row_idx, value):
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raise NotImplementedError("Tensorflow doesn't support inplace index_add")
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def scatter_row_inplace(data, row_index, value):
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raise NotImplementedError("Tensorflow doesn't support inplace update")
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def squeeze(input, dim):
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return tf.squeeze(input, axis=dim)
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def unsqueeze(input, dim):
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return tf.expand_dims(input, axis=dim)
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def reshape(input, shape):
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return tf.reshape(input, shape)
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def swapaxes(input, axis1, axis2):
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ndim = input.ndim
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t = list(range(ndim))
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t[axis1], t[axis2] = axis2 % ndim, axis1 % ndim
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return tf.transpose(input, perm=t)
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def empty(shape, dtype, ctx):
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# tf doesn't have tf.empty(), use zeros() as a workaround
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return zeros(shape, dtype, ctx)
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def zeros(shape, dtype, ctx):
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with tf.device(ctx):
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t = tf.zeros(shape, dtype=dtype)
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return t
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def zeros_like(input):
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return tf.zeros_like(input)
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def ones(shape, dtype, ctx):
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with tf.device(ctx):
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t = tf.ones(shape, dtype=dtype)
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return t
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def uniform(shape, dtype, ctx, low, high):
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with tf.device(ctx):
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t = tf.random.uniform(shape, dtype=dtype, minval=low, maxval=high)
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return t
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def randint(shape, dtype, ctx, low, high):
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with tf.device(ctx):
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t = tf.random.uniform(shape, dtype=dtype, minval=low, maxval=high)
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return t
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def pad_packed_tensor(input, lengths, value, l_min=None):
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old_shape = input.shape
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if isinstance(lengths, tf.Tensor):
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max_len = as_scalar(tf.reduce_max(lengths))
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else:
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max_len = builtins.max(lengths)
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if l_min is not None:
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max_len = builtins.max(max_len, l_min)
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batch_size = len(lengths)
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ndim = input.ndim
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tensor_list = []
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cum_row = 0
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pad_nparray = np.zeros((ndim, 2), dtype=np.int32)
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for l in lengths:
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t = input[cum_row : cum_row + l]
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pad_nparray[0, 1] = max_len - l
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t = tf.pad(
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t, tf.constant(pad_nparray), mode="CONSTANT", constant_values=value
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)
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tensor_list.append(t)
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cum_row += l
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return tf.stack(tensor_list, axis=0)
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def pack_padded_tensor(input, lengths):
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out_list = []
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for i, l in enumerate(lengths):
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t = input[i]
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out = t[:l]
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out_list.append(out)
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return tf.concat(out_list, axis=0)
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def boolean_mask(input, mask):
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return tf.boolean_mask(input, mask)
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def equal(x, y):
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return x == y
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def allclose(x, y, rtol=1e-4, atol=1e-4):
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return np.allclose(
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tf.convert_to_tensor(x).numpy(),
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tf.convert_to_tensor(y).numpy(),
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rtol=rtol,
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atol=atol,
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)
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def logical_not(input):
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return ~input
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def logical_and(input1, input2):
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return tf.math.logical_and(input1, input2)
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def clone(input):
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# TF tensor is always immutable so returning the input is safe.
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return input
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def clamp(data, min_val, max_val):
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return tf.clip_by_value(data, min_val, max_val)
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def replace_inf_with_zero(x):
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return tf.where(tf.abs(x) == np.inf, 0, x)
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def count_nonzero(input):
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return int(tf.math.count_nonzero(input))
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def unique(input, return_inverse=False, return_counts=False):
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if return_inverse and return_counts:
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return tf.unique_with_counts(input)
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elif return_counts:
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result = tf.unique_with_counts(input)
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return result.y, result.count
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elif return_inverse:
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return tf.unique(input)
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else:
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return tf.unique(input).y
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def full_1d(length, fill_value, dtype, ctx):
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with tf.device(ctx):
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t = tf.fill([length], value=fill_value)
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t = tf.cast(t, dtype=dtype)
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return t
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def nonzero_1d(input):
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nonzero_bool = tf.cast(input, tf.bool)
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return tf.reshape(tf.where(nonzero_bool), (-1,))
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def sort_1d(input):
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return tf.sort(input), tf.cast(tf.argsort(input), dtype=tf.int64)
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def arange(start, stop, dtype=tf.int64, ctx=None):
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if not ctx:
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ctx = "/cpu:0"
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with tf.device(ctx):
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t = tf.range(start, stop, dtype=dtype)
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return t
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def rand_shuffle(arr):
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return tf.random.shuffle(arr)
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def zerocopy_to_numpy(input):
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return np.asarray(memoryview(input))
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def zerocopy_from_numpy(np_array):
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# NOTE: not zerocopy
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# This assumes tensor should be on cpu
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with tf.device("/cpu:0"):
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t = tf.convert_to_tensor(np_array)
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return t
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def zerocopy_to_dgl_ndarray(data):
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if device_type(data.device) == "gpu" and data.dtype in (tf.int32, tf.int64):
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# NOTE: TF doesn't keep signed tensors on GPU due to legacy issues with
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# shape inference. Convert it to unsigned and cast it back afterwards.
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if data.dtype == tf.int32:
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data = tf.cast(data, tf.uint32)
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elif data.dtype == tf.int64:
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data = tf.cast(data, tf.uint64)
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return nd.cast_to_signed(nd.from_dlpack(zerocopy_to_dlpack(data)))
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else:
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return nd.from_dlpack(zerocopy_to_dlpack(data))
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def zerocopy_to_dgl_ndarray_for_write(input):
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return zerocopy_to_dgl_ndarray(input)
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def zerocopy_from_dgl_ndarray(input):
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return zerocopy_from_dlpack(input.to_dlpack())
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def sync():
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context = context().context()
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context.async_wait()
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class GradContext:
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def __init__(self):
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self.tensor_for_grad = []
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self.grad_list = []
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self.tape = None
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def set_tape(self, tape):
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self.tape = tape
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def add_tensor(self, x):
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idx_pop = []
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for idx, ele in enumerate(self.tensor_for_grad):
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if ele._id == x._id:
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idx_pop.append(idx)
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if len(idx_pop) > 0:
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self.tensor_for_grad.pop(idx_pop[0])
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if self.tape is not None:
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self.tape.watch(x)
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self.tensor_for_grad.append(x)
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def backward(self, x, head_gradient=None):
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if head_gradient is not None:
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x = x * head_gradient
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self.grad_list = self.tape.gradient(x, self.tensor_for_grad)
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def is_no_grad(self, x):
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idx_pop = []
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for idx, ele in enumerate(self.tensor_for_grad):
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if ele._id == x._id:
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idx_pop.append(idx)
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if len(idx_pop) == 0:
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return True
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else:
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return self.grad_list[idx_pop[0]] is None
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def grad(self, x):
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idx_pop = []
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for idx, ele in enumerate(self.tensor_for_grad):
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if ele._id == x._id:
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idx_pop.append(idx)
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assert len(idx_pop) == 1
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t = self.grad_list[idx_pop[0]]
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return tf.convert_to_tensor(t)
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cgrad = GradContext()
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def get_cgrad():
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return cgrad
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|
|
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class record_grad:
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def __init__(self):
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self.tape = tf.GradientTape()
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|
|
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def __enter__(self):
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|
cgrad.set_tape(self.tape)
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|
self.tape.__enter__()
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|
for x in cgrad.tensor_for_grad:
|
|
self.tape.watch(x)
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|
|
|
def __exit__(self, exc_type, exc_value, exc_traceback):
|
|
# pass
|
|
self.tape.__exit__(exc_type, exc_value, exc_traceback)
|
|
cgrad.tape = None
|
|
|
|
|
|
def attach_grad(x):
|
|
cgrad.add_tensor(x)
|
|
return x
|
|
|
|
|
|
def backward(x, head_gradient=None):
|
|
cgrad.backward(x, head_gradient)
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|
|
|
|
|
def grad(x):
|
|
return cgrad.grad(x)
|
|
|
|
|
|
def is_no_grad(x):
|
|
return cgrad.is_no_grad(x)
|
|
|
|
|
|
def is_recording():
|
|
raise NotImplementedError("Tensorflow doesn't support is_recording")
|
|
|
|
|
|
no_grad = None
|
|
|
|
initialize_context()
|