# tf.contrib.layers.real_valued_column(column_name, dimension=1, default_value=None, dtype=tf.float32, normalizer=None)

### tf.contrib.layers.real_valued_column(column_name, dimension=1, default_value=None, dtype=tf.float32, normalizer=None)

See the guide: Layers (contrib) > Feature columns

Creates a _RealValuedColumn for dense numeric data.

#### Args:

• column_name: A string defining real valued column name.
• dimension: An integer specifying dimension of the real valued column. The default is 1. When dimension is not None, the Tensor representing the _RealValuedColumn will have the shape of [batch_size, dimension]. A None dimension means the feature column should be treat as variable length and will be parsed as a SparseTensor.
• default_value: A single value compatible with dtype or a list of values compatible with dtype which the column takes on during tf.Example parsing if data is missing. When dimension is not None, a default value of None will cause tf.parse_example to fail if an example does not contain this column. If a single value is provided, the same value will be applied as the default value for every dimension. If a list of values is provided, the length of the list should be equal to the value of dimension. Only scalar default value is supported in case dimension is not specified.
• dtype: defines the type of values. Default value is tf.float32. Must be a non-quantized, real integer or floating point type.
• normalizer: If not None, a function that can be used to normalize the value of the real valued column after default_value is applied for parsing. Normalizer function takes the input tensor as its argument, and returns the output tensor. (e.g. lambda x: (x - 3.0) / 4.2). Note that for variable length columns, the normalizer should expect an input_tensor of type SparseTensor. Returns: A _RealValuedColumn. Raises:
• TypeError: if dimension is not an int
• ValueError: if dimension is not a positive integer
• TypeError: if default_value is a list but its length is not equal to the value of dimension.
• TypeError: if default_value is not compatible with dtype.
• ValueError: if dtype is not convertable to tf.float32.