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Numpy Operations

Below is the list of the data-parallel Numpy operators that Bodo can optimize and parallelize.

Numpy element-wise array operations

Unary operators

  • +
  • -
  • ~

Binary operators

  • +
  • -
  • *
  • /
  • /?
  • %
  • |
  • >>
  • ^
  • <<
  • &
  • **
  • //

Comparison operators

  • ==
  • !=
  • <
  • <=
  • >
  • >=

Data-parallel math operations

  • numpy.add
  • numpy.subtract
  • numpy.multiply
  • numpy.divide
  • numpy.logaddexp
  • numpy.logaddexp2
  • numpy.true_divide
  • numpy.floor_divide
  • numpy.negative
  • numpy.positive
  • numpy.power
  • numpy.remainder
  • numpy.mod
  • numpy.fmod
  • numpy.abs
  • numpy.absolute
  • numpy.fabs
  • numpy.rint
  • numpy.sign
  • numpy.conj
  • numpy.exp
  • numpy.exp2
  • numpy.log
  • numpy.log2
  • numpy.log10
  • numpy.expm1
  • numpy.log1p
  • numpy.sqrt
  • numpy.square
  • numpy.reciprocal
  • numpy.gcd
  • numpy.lcm
  • numpy.conjugate

Trigonometric functions

  • numpy.sin
  • numpy.cos
  • numpy.tan
  • numpy.arcsin
  • numpy.arccos
  • numpy.arctan
  • numpy.arctan2
  • numpy.hypot
  • numpy.sinh
  • numpy.cosh
  • numpy.tanh
  • numpy.arcsinh
  • numpy.arccosh
  • numpy.arctanh
  • numpy.deg2rad
  • numpy.rad2deg
  • numpy.degrees
  • numpy.radians

Bit manipulation functions

  • numpy.bitwise_and
  • numpy.bitwise_or
  • numpy.bitwise_xor
  • numpy.bitwise_not
  • numpy.invert
  • numpy.left_shift
  • numpy.right_shift

Comparison functions

  • numpy.logical_and
  • numpy.logical_or
  • numpy.logical_xor
  • numpy.logical_not

Floating functions

  • numpy.isfinite
  • numpy.isinf
  • numpy.signbit
  • numpy.ldexp
  • numpy.floor
  • numpy.ceil
  • numpy.trunc

Numpy reduction functions

  • numpy.sum
  • numpy.prod
  • numpy.min
  • numpy.max
  • numpy.argmin
  • numpy.argmax
  • numpy.all
  • numpy.any

Numpy array creation functions

  • numpy.empty
  • numpy.identity
  • numpy.zeros
  • numpy.ones
  • numpy.empty_like
  • numpy.zeros_like
  • numpy.ones_like
  • numpy.full_like
  • numpy.array
  • numpy.asarray
  • numpy.copy
  • numpy.arange
  • numpy.linspace
  • numpy.repeat only scalar num_repeats

Numpy array manipulation functions

  • numpy.shape

  • numpy.reshape

    shape values cannot be -1.

  • numpy.sort

  • numpy.concatenate
  • numpy.append

  • numpy.unique The output is assumed to be "small" relative to input and is replicated. Use Series.drop_duplicates() if the output should remain distributed.

  • numpy.where (1 and 3 arguments)

  • numpy.select The default value for numeric/boolean types is 0/False. For all other types, the default is pd.NA. If any of the values in choicelist are nullable, or the default is pd.NA or None, the output will be a nullable pandas array instead of a numpy array.
  • numpy.nan_to_num converts infinity/NaN values to regular floats.
  • numpy.union1d
  • numpy.intersect1d no distributed support yet
  • numpy.setdiff1d no distributed support yet
  • numpy.hstack concatenates elements on each rank without maintaining order
  • numpy.tile Supported in 2 cases: the array is 2D and reps is in the form (1, x), or the array is 1D and reps is in the form (x, 1).
  • numpy.ndarray.T distributed array transpose is supported for 2D arrays.

Numpy mathematical and statistics functions

  • numpy.cumsum
  • numpy.diff
  • numpy.percentile
  • numpy.quantile
  • numpy.median
  • numpy.mean
  • numpy.std
  • numpy.interp no distributed support yet.
  • np.linalg.norm parallelized only for 2D inputs with axis=1.

Random number generator functions

  • numpy.random.rand
  • numpy.random.randn
  • numpy.random.ranf
  • numpy.random.random_sample
  • numpy.random.sample
  • numpy.random.random
  • numpy.random.standard_normal
  • numpy.random.multivariate_normal (must provide size)
  • numpy.random.chisquare
  • numpy.random.weibull
  • numpy.random.power
  • numpy.random.geometric
  • numpy.random.exponential
  • numpy.random.poisson
  • numpy.random.rayleigh
  • numpy.random.normal
  • numpy.random.uniform
  • numpy.random.beta
  • numpy.random.binomial
  • numpy.random.f
  • numpy.random.gamma
  • numpy.random.lognormal
  • numpy.random.laplace
  • numpy.random.randint
  • numpy.random.triangular

numpy.dot function

  • numpy.dot between a matrix and a vector or between two vectors.

Numpy I/O

  • numpy.ndarray.tofile
  • numpy.fromfile supports reading binary files. file, dtype, count, and offset arguments are supported (file and dtype are required). file should be a string. s3:// and hdfs:// file paths are also supported.

Our documentation on scalable I/O contains example usage and more system specific instructions.

Numpy matrix support

  • numpy.asmatrix parallelized only for array or matrix input.
  • * left-hand side argument can be distributed but right-hand side argument is replicated.

Scipy support

  • scipy.fftpack.fft2 supports complex64 and complex128 data. Bodo uses FFTW as the backend FFT library. FFTW performs parameter tuning for best performance the first time the program is run. The parameters are stored in a file named .fftw_wisdom or .fftwf_wisdom to be reused for subsequent runs. Environment variable BODO_FFTW_PLANNING allows setting the FFTW planning flag (e.g. FFTW_ESTIMATE), and BODO_FFTW_PLANNING_TIMEOUT allows setting FFTW planning timeout (default is 1 hour). See FFTW documentation for more information.

  • scipy.fftpack.fftshift supports 2D arrays of complex64 and complex128 data.

Miscellaneous

  • Numpy array comprehension : e.g. : A = np.array([i**2 for i in range(N)])

Note

Optional arguments are not supported unless if explicitly mentioned here. For operations on multi-dimensional arrays, automatic broadcast of dimensions of size 1 is not supported.

Numpy dot() Parallelization

The np.dot function has different distribution rules based on the number of dimensions and the distributions of its input arrays. The example below demonstrates two cases:

@bodo.jit
def example_dot(N, D):
    X = np.random.ranf((N, D))
    Y = np.random.ranf(N)
    w = np.dot(Y, X)
    z = np.dot(X, w)
    return z.sum()

example_dot(1024, 10)
example_dot.distributed_diagnostics()

Here is the output of distributed_diagnostics():

Data distributions:
  $X.130               1D_Block
  $Y.131               1D_Block
  $b.2.158             REP

Parfor distributions:
  0                    1D_Block
  1                    1D_Block
  3                    1D_Block

Distributed listing for function example_dot, ../tmp/dist_rep.py (4)
++++++++++++++++++++++++++++++++++| parfor_id/variable: distribution
@bodo.jit                         |
def example_dot(N, D):            |
    X = np.random.ranf((N, D))++++| #0: 1D_Block, $X.130: 1D_Block
    Y = np.random.ranf(N)+++++++++| #1: 1D_Block, $Y.131: 1D_Block
    w = np.dot(Y, X)++++++++++++++| $b.2.158: REP
    z = np.dot(X, w)++++++++++++++| #3: 1D_Block
    return z.sum()                |

The first dot has a 1D array with 1D_Block distribution as first input Y, while the second input X is a 2D array with 1D_Block distribution. Hence, dot is a sum reduction across distributed datasets and therefore, the output (w) is on the reduce side and is assigned REP distribution.

The second dot has a 2D array with 1D_Block distribution (X) as first input, while the second input is a REP array (w). Hence, the computation is data-parallel across rows of X, which implies a 1D_Block distribution for output (z).

Variable z does not exist in the distribution report since the compiler optimizations were able to eliminate it. Its values are generated and consumed on-the-fly, without memory load/store overheads.