Python random_ops.random_uniform函数代码示例

 def benchmarkBatchSelect(self):
   for (m, n, use_gpu) in itertools.product([1000, 10000, 100000],
                                            [10, 100, 1000], [False, True]):
     name = "m_%d_n_%d_use_gpu_%s" % (m, n, use_gpu)
     device = "/%s:0" % ("gpu" if use_gpu else "cpu")
     with ops.Graph().as_default():
       with ops.device(device):
         x_gen = random_ops.random_uniform([m, n], dtype=dtypes.float32)
         y_gen = random_ops.random_uniform([m, n], dtype=dtypes.float32)
         c_gen = random_ops.random_uniform([m], dtype=dtypes.float32) <= 0.5
         x = resource_variable_ops.ResourceVariable(x_gen)
         y = resource_variable_ops.ResourceVariable(y_gen)
         c = resource_variable_ops.ResourceVariable(c_gen)
         op = array_ops.where(c, x, y)
       with session.Session(config=benchmark.benchmark_config()) as sess:
         x.initializer.run()
         y.initializer.run()
         c.initializer.run()
         r = self.run_op_benchmark(sess, op, min_iters=100, name=name)
         # approximate size of output: m*n*2 floats for each axis.
         gb_processed = m * n * 8 / 1.0e9
         throughput = gb_processed / r["wall_time"]
         print("Benchmark: %s \t wall_time: %0.03g s \t "
               "Throughput: %0.03g GB/s" % (name, r["wall_time"], throughput))
         sys.stdout.flush()

  def _test_unary_cwise_ops(self, ops, is_complex):
    for op in ops:
      with backprop.GradientTape(persistent=True) as g:
        x = random_ops.random_uniform([3, 5])
        g.watch(x)
        if is_complex:
          y = random_ops.random_uniform([3, 5])
          g.watch(y)
          x = math_ops.complex(x, y)

      # pylint: disable=cell-var-from-loop
      output_dtypes = []

      def loop_fn(i):
        with g:
          x1 = array_ops.gather(x, i)
          y1 = op(x1)
          outputs = [op(x), y1]
          if y1.dtype == dtypes.float32:
            loss = math_ops.reduce_sum(y1 * y1)
          else:
            loss = None
        if loss is not None:
          grad = g.gradient(loss, x1)
          if grad is not None:
            outputs.append(grad)
        del output_dtypes[:]
        output_dtypes.extend([t.dtype for t in outputs])
        return outputs

      # pylint: enable=cell-var-from-loop

      self._test_loop_fn(loop_fn, 3, loop_fn_dtypes=output_dtypes)

  def testHasBias(self):
    with tf_ops.Graph().as_default():
      inputs = random_ops.random_uniform(
          [self.batch_size, self.height, self.width, self.in_channels])
      outputs_grads = [
          random_ops.random_uniform([
              self.batch_size, self.height // self.strides[1],
              self.width // self.strides[2], self.out_channels
          ]) for _ in range(3)
      ]

      factor = ff.ConvDiagonalFactor(
          inputs,
          outputs_grads,
          self.kernel_shape,
          self.strides,
          self.padding,
          data_format=self.data_format,
          has_bias=True)
      factor.instantiate_cov_variables()

      # Ensure shape accounts for bias.
      self.assertEqual([
          self.kernel_height * self.kernel_width * self.in_channels + 1,
          self.out_channels
      ],
                       factor.get_cov_var().shape.as_list())

      # Ensure update op doesn't crash.
      cov_update_op = factor.make_covariance_update_op(0.0)
      with self.test_session() as sess:
        sess.run(tf_variables.global_variables_initializer())
        sess.run(cov_update_op)

  def test_while_jacobian(self):
    x = random_ops.random_uniform([1, 3])
    y = random_ops.random_uniform([3, 3])

    # out = x @ y @ y @ y @ y, where @ is matmul operator.
    _, out = control_flow_ops.while_loop(
        lambda i, _: i < 4, lambda i, out: (i + 1, math_ops.matmul(out, y)),
        [0, x])

    def loop_fn(i):
      out_i = array_ops.gather(out, i, axis=1)
      return array_ops.reshape(gradient_ops.gradients(out_i, x)[0], [-1])

    out = pfor_control_flow_ops.pfor(loop_fn, iters=3)

    # The above code does not work with tf.while_loop instead of pfor. So we
    # manually compute the expected output here.
    # Note that gradient of output w.r.t is (y @ y @ y @ y)^T.
    expected_output = y
    for _ in range(3):
      expected_output = math_ops.matmul(expected_output, y)
    expected_output = array_ops.transpose(expected_output, [1, 0])

    with session.Session() as sess:
      out, expected = sess.run([out, expected_output])
      self.assertAllClose(expected, out)

  def testImportGraphWithFunctionTwice(self):
    g = ops.Graph()
    with g.as_default():

      @function.Defun()
      def Add2(x, y):
        return math_ops.add(x, y)

      x = array_ops.placeholder(dtype=dtypes.float32, name="x")
      y = array_ops.placeholder(dtype=dtypes.float32, name="y")
      _ = Add2(x, y, name="z")  # pylint: disable=unexpected-keyword-arg

    gdef = g.as_graph_def()

    x = random_ops.random_uniform(dtype=dtypes.float32, shape=())
    y = random_ops.random_uniform(dtype=dtypes.float32, shape=())
    input_map = {"x:0": x, "y:0": y}

    with ops.name_scope("first"):
      z1 = importer.import_graph_def(gdef, return_elements=["z:0"],
                                     input_map=input_map)[0]

    with ops.name_scope("second"):
      z2 = importer.import_graph_def(gdef, return_elements=["z:0"],
                                     input_map=input_map)[0]

    with self.test_session() as sess:
      z1_val, z2_val = sess.run((z1, z2))
      self.assertAllEqual(z1_val, z2_val)

  def testConstraints(self):
    # Conv1D
    k_constraint = lambda x: x / math_ops.reduce_sum(x)
    b_constraint = lambda x: x / math_ops.reduce_max(x)
    conv1d = conv_layers.Conv1D(2, 3,
                                kernel_constraint=k_constraint,
                                bias_constraint=b_constraint)
    inputs = random_ops.random_uniform((5, 3, 5), seed=1)
    conv1d(inputs)
    self.assertEqual(conv1d.kernel_constraint, k_constraint)
    self.assertEqual(conv1d.bias_constraint, b_constraint)

    # Conv2D
    k_constraint = lambda x: x / math_ops.reduce_sum(x)
    b_constraint = lambda x: x / math_ops.reduce_max(x)
    conv2d = conv_layers.Conv2D(2, 3,
                                kernel_constraint=k_constraint,
                                bias_constraint=b_constraint)
    inputs = random_ops.random_uniform((5, 3, 3, 5), seed=1)
    conv2d(inputs)
    self.assertEqual(conv2d.kernel_constraint, k_constraint)
    self.assertEqual(conv2d.bias_constraint, b_constraint)

    # Conv3D
    k_constraint = lambda x: x / math_ops.reduce_sum(x)
    b_constraint = lambda x: x / math_ops.reduce_max(x)
    conv3d = conv_layers.Conv3D(2, 3,
                                kernel_constraint=k_constraint,
                                bias_constraint=b_constraint)
    inputs = random_ops.random_uniform((5, 3, 3, 3, 5), seed=1)
    conv3d(inputs)
    self.assertEqual(conv3d.kernel_constraint, k_constraint)
    self.assertEqual(conv3d.bias_constraint, b_constraint)

  def test_good_kernel_approximation_multiple_inputs(self, initializer, scale,
                                                     exact_kernel_fn):
    # Parameters.
    input_dim = 5
    output_dim = 5000
    x_rows = 20
    y_rows = 30

    random_seed.set_random_seed(1234)
    x = random_ops.random_uniform(shape=(x_rows, input_dim), maxval=1.0)
    y = random_ops.random_uniform(shape=(y_rows, input_dim), maxval=1.0)

    rff_layer = kernel_layers.RandomFourierFeatures(
        output_dim=output_dim,
        kernel_initializer=initializer,
        scale=scale,
        name='random_fourier_features')

    # The shapes of output_x and output_y are (x_rows, output_dim) and
    # (y_rows, output_dim) respectively.
    output_x = math.sqrt(2.0 / output_dim) * rff_layer.apply(x)
    output_y = math.sqrt(2.0 / output_dim) * rff_layer.apply(y)

    approx_kernel_matrix = kernelized_utils.inner_product(output_x, output_y)
    exact_kernel_matrix = exact_kernel_fn(x, y)
    self._assert_all_close(approx_kernel_matrix, exact_kernel_matrix, atol=0.1)

 def input_fn():
   start = random_ops.random_uniform(
       (), minval=0, maxval=sequence_length, dtype=dtypes.int32, seed=seed)
   # Concatenate lyrics_list so inputs and labels wrap when start > 0.
   lyrics_list_concat = lyrics_list + lyrics_list
   inputs_dense = array_ops.slice(lyrics_list_concat, [start],
                                  [sequence_length])
   indices = array_ops.constant(
       [[i, 0] for i in range(sequence_length)], dtype=dtypes.int64)
   dense_shape = [sequence_length, 1]
   inputs = sparse_tensor.SparseTensor(
       indices=indices, values=inputs_dense, dense_shape=dense_shape)
   table = lookup.string_to_index_table_from_tensor(
       mapping=list(vocab), default_value=-1, name='lookup')
   labels = table.lookup(
       array_ops.slice(lyrics_list_concat, [start + 1], [sequence_length]))
   input_key = string_ops.string_join([
       'key_', string_ops.as_string(
           random_ops.random_uniform(
               (),
               minval=0,
               maxval=10000000,
               dtype=dtypes.int32,
               seed=seed))
   ])
   return {'lyrics': inputs, input_key_column_name: input_key}, labels

  def _testKLPenaltyBoth(self, layer_class):
    def _make_normal(dtype, *args):  # pylint: disable=unused-argument
      return normal_lib.Normal(
          loc=dtype.as_numpy_dtype(0.), scale=dtype.as_numpy_dtype(1.))
    with self.test_session():
      layer = layer_class(
          filters=2,
          kernel_size=3,
          bias_posterior_fn=prob_layers_util.default_mean_field_normal_fn(),
          bias_prior_fn=_make_normal)
      if layer_class == prob_layers_lib.Conv1DVariational:
        inputs = random_ops.random_uniform([2, 3, 1], seed=1)
      elif layer_class == prob_layers_lib.Conv2DVariational:
        inputs = random_ops.random_uniform([2, 3, 3, 1], seed=1)
      elif layer_class == prob_layers_lib.Conv3DVariational:
        inputs = random_ops.random_uniform([2, 3, 3, 3, 1], seed=1)

      # No keys.
      losses = ops.get_collection(ops.GraphKeys.REGULARIZATION_LOSSES)
      self.assertEqual(len(losses), 0)
      self.assertListEqual(layer.losses, losses)

      _ = layer(inputs)

      # Yes keys.
      losses = ops.get_collection(ops.GraphKeys.REGULARIZATION_LOSSES)
      self.assertEqual(len(losses), 2)
      self.assertListEqual(layer.losses, losses)

 def model_fn():
   """Mnist model with synthetic input."""
   data_format = 'channels_last'
   input_shape = [28, 28, 1]
   l = keras.layers
   max_pool = l.MaxPooling2D((2, 2), (2, 2),
                             padding='same',
                             data_format=data_format)
   model = keras.Sequential([
       l.Reshape(target_shape=input_shape, input_shape=(28 * 28,)),
       l.Conv2D(
           32,
           5,
           padding='same',
           data_format=data_format,
           activation=nn.relu), max_pool,
       l.Conv2D(
           64,
           5,
           padding='same',
           data_format=data_format,
           activation=nn.relu), max_pool,
       l.Flatten(),
       l.Dense(1024, activation=nn.relu),
       l.Dropout(0.4),
       l.Dense(10)
   ])
   image = random_ops.random_uniform([2, 28, 28])
   label = random_ops.random_uniform([2, 1], maxval=10, dtype=dtypes.int32)
   logits = model(image, training=True)
   loss = losses.sparse_softmax_cross_entropy(labels=label, logits=logits)
   optimizer = adam.AdamOptimizer(learning_rate=1e-4)
   train_op = optimizer.minimize(loss,
                                 training_util.get_or_create_global_step())
   return train_op

  def test_binary_cwise_ops(self):
    logical_ops = [
        math_ops.logical_and, math_ops.logical_or, math_ops.logical_xor
    ]
    bool_ops = [
        math_ops.less, math_ops.less_equal, math_ops.greater,
        math_ops.greater_equal, math_ops.equal, math_ops.not_equal
    ]
    float_ops = [
        math_ops.add, math_ops.subtract, math_ops.multiply, math_ops.divide,
        math_ops.maximum, math_ops.minimum
    ]
    for op in logical_ops + bool_ops + float_ops:
      x = random_ops.random_uniform([7, 3, 5])
      y = random_ops.random_uniform([3, 5])
      if op in logical_ops:
        x = x > 0
        y = y > 0

      # pylint: disable=cell-var-from-loop
      def loop_fn(i):
        x1 = array_ops.gather(x, i)
        y1 = array_ops.gather(y, i)
        return op(x, y), op(x1, y), op(x, y1), op(x1, y1), op(x1, x1)

      # pylint: enable=cell-var-from-loop

      dtype = dtypes.float32 if op in float_ops else dtypes.bool
      self._test_loop_fn(loop_fn, 3, loop_fn_dtypes=[dtype] * 5)

  def testLargeCase(self):
    shape = [32, 512, 256, 1]
    predictions = random_ops.random_uniform(
        shape, 0.0, 1.0, dtype=dtypes_lib.float32)
    labels = math_ops.greater(random_ops.random_uniform(shape, 0.0, 1.0), 0.5)

    result, update_op = metric_ops.precision_recall_at_equal_thresholds(
        labels=labels, predictions=predictions, num_thresholds=201)
    # Run many updates, enough to cause highly inaccurate values if the
    # code used float32 for accumulation.
    num_updates = 71

    with self.test_session() as sess:
      sess.run(variables.local_variables_initializer())
      for _ in xrange(num_updates):
        sess.run(update_op)

      prdata = sess.run(result)

      # Since we use random values, we won't know the tp/fp/tn/fn values, but
      # tp and fp at threshold 0 should be the total number of positive and
      # negative labels, hence their sum should be total number of pixels.
      expected_value = 1.0 * np.product(shape) * num_updates
      got_value = prdata.tp[0] + prdata.fp[0]
      # They should be at least within 1.
      self.assertNear(got_value, expected_value, 1.0)

  def testGradientFloat16(self):
    with self.test_session(use_gpu=True) as sess:
      # Randomly construct a 1D shape from [1, 40)
      shape = random_ops.random_uniform(
          [1], minval=1, maxval=40, dtype=dtypes.int32)

      # Construct the fp32 graph and its gradient.
      x = random_ops.random_uniform(shape, minval=-1, maxval=1, name="x")
      y1 = nn_ops.relu(x, name="relu_fp32")
      l1 = nn_ops.l2_loss(y1)
      dx_f32 = gradients_impl.gradients(l1, x)

      # Construct the fp16 graph and its gradient.
      # It starts with the same x, in fp32. But before it reaches Relu, it is
      # cast into fp16. So during backprop, the gradient computation is in fp16.
      x2 = math_ops.cast(x, dtype=dtypes.float16, name="cast")
      y2 = nn_ops.relu(x2, name="relu_fp16")
      l2 = nn_ops.l2_loss(y2)
      dx_f16 = gradients_impl.gradients(l2, x)

      # Repeat the experiment for 100 times. All tensor shapes and its tensor
      # values are randomly generated for each run.
      for _ in xrange(100):
        dx_f32_v, dx_f16_v = sess.run([dx_f32, dx_f16])
        self.assertAllClose(dx_f32_v, dx_f16_v, atol=3e-4)

  def testVirtualCluster(self):
    with ops.Graph().as_default() as g:
      a = random_ops.random_uniform(shape=())
      b = random_ops.random_uniform(shape=())
      c = a + b
      train_op = ops.get_collection_ref(ops.GraphKeys.TRAIN_OP)
      train_op.append(c)
      mg = meta_graph.create_meta_graph_def(graph=g)
      grappler_item = item.Item(mg)
      device_properties = device_properties_pb2.DeviceProperties(
          type='GPU',
          frequency=1000,
          num_cores=60,
          environment={
              'architecture': '7'
          })
      named_device = device_properties_pb2.NamedDevice(
          properties=device_properties, name='/GPU:0')
      grappler_cluster = cluster.Cluster(devices=[named_device])
      op_perfs, run_time, _ = grappler_cluster.MeasureCosts(grappler_item)
      self.assertGreater(run_time, 0)
      self.assertEqual(len(op_perfs), 15)

      estimated_perf = grappler_cluster.EstimatePerformance(named_device)
      self.assertEqual(7680.0, estimated_perf)

  def testCustomGrad(self):

    def fn(a, b, c):
      return core_layers.dense(a, 10, use_bias=False) + math_ops.matmul(b, c)

    def grad_fn(inputs, trainable_variables, unused_outputs,
                unused_grad_outputs):
      grad_inputs = [
          array_ops.ones_like(t) * (i + 1.) for i, t in enumerate(inputs)
      ]
      grad_vars = [
          array_ops.ones_like(t) * (i + len(inputs) + 1.)
          for i, t in enumerate(trainable_variables)
      ]
      return grad_inputs, grad_vars

    a = random_ops.random_uniform([11, 6])
    b = random_ops.random_uniform([11, 7])
    c = random_ops.random_uniform([7, 10])
    w = random_ops.random_uniform([6, 10])
    out = rev_block_lib._fn_with_custom_grad(grad_fn)(fn)(a, b, c)
    loss = math_ops.reduce_mean(out)
    grads = gradients_impl.gradients(
        loss, [a, b, c, variables.trainable_variables()[0]])
    expected_grads = [
        array_ops.ones_like(t) * (i + 1.) for i, t in enumerate([a, b, c, w])
    ]
    with self.test_session() as sess:
      sess.run(variables.global_variables_initializer())
      g_val, eg_val = sess.run([grads, expected_grads])
      for g1, g2 in zip(g_val, eg_val):
        self.assertAllClose(g1, g2)